瑞典专利SE1350624A1 An indexable drill bit

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专利摘要:
The present invention relates to a square indexable drill insert. The drilling insert comprises a substantially flat upper surface, a lower surface and a side surface which links the upper and the lower surface. The side surface includes four identical cutting edges that meet the upper surface; each cutting edge comprises a first partial edge which is directed inwards towards the axis of the drill body. A second partial edge, tangential to an imaginary inscribed circle diameter, is linked to the first partial edge by a convex curve. A third partial edge is linked to the second partial edge by a concave curve and a fourth partial edge is linked to the third partial edge by a convex curve. The insert further comprises a curved muzzle at each of four corners, which muzzle links the first partial edge of a cutting edge with the fourth partial edge of the subsequent cutting edge.FIG. 1
公开号:SE1350624A1
申请号:SE1350624
申请日:2013-05-22
公开日:2013-11-29
发明作者:Karthic Ramesh
申请人:Kennametal India Ltd；
IPC主号:

专利说明:

20 25 30 on the entire drill body and not exactly centrally. The drift of the drill also creates a thin wall, which is unsuitable for practical applications. Furthermore, conventional drilling inserts wear against the surface of the borehole, if the diameter of the borehole is less than the predetermined value.
Recently, many different techniques have been introduced by ﬂ your manufacturers of drilling inserts, to balance the cutting forces in the drill body so that the drift of the drill body from the centered position is prevented. One such technique is to divide the cutting edge into a number of partial edges. The partial edges are aligned according to a predetermined pattern, to balance the cutting forces. In conventional drilling inserts, the partial edges are linked together by a transition edge which comprises a convex curve and a concave curve. The chip formation in the conventional cutting inserts is not smooth, because there is a sudden change from the concave part to the convex part, which results in an area with a high load. In addition, the chips can sometimes be divided into smaller fragments, which instead of ending up in the groove of the drilling tool follow the drilling tool around and thereby destroy the surface ish nish in the hole made.
In the light of the foregoing discussion, it is necessary to develop a drilling insert which overcomes the limitations of the prior art, which was described in the background section above.
SUMMARY OF THE INVENTION The shortcomings of the prior art are overcome and further advantages are obtained by providing a drilling insert according to the claims of the present invention.
Additional features and advantages are provided by the technical methods of the present invention. Other embodiments and aspects of the invention are described in detail in this text and are considered to be part of the claimed invention.
The present invention provides a square, indexable drilling insert, comprising: a substantially planar upper surface and lower surface, a side surface which on four sides of the drilling insert adjoins the upper and lower surfaces, the lower surface being smaller than the upper surface to provide a positive cutting geometry. Four identical cutting edges of the side surface meet the upper surface, each cutting edge comprising a first partial edge, which is directed inwards towards the axis of the drill body, when this first partial edge is seen from the nearest corner of the drilling insert; a second partial edge extending from the first partial edge and tangential to an imaginary, inscribed circle about the axis of the insert; a third partial edge extending away from the central axis of the drill insert and linked to the second partial edge by a concave curve, and a fourth partial edge, which is directed away from the central axis of the drill insert, when this fourth partial edge is seen from the corner of the drill insert which is located furthest away and which is linked to the third partial edge by a convex curve. The drilling insert further comprises four curved nose portions, each of which has a predetermined radius and which are arranged at each of the four corners of the drilling insert. Each curved muzzle links the first partial edge of one of the cutting edges with the fourth partial edge of a subsequent cutting edge. The drilling insert further comprises a through hole in the middle of the drilling insert, which extends between the upper surface and the lower surface of the drilling insert for mounting the insert at the drill body, and a chamfer formed at the lower edge of the drilling insert.
In an embodiment according to the present invention, said drilling insert is mounted in a circumferentially formed hole in the drill body. In an embodiment according to the present invention, the partial edges are linear, the first partial edge, the second partial edge, the third partial edge and the the fourth partial edge is inclined at an angle in the range from about 0.5 ° to about 5 °, from about 5 ° to about 15 °, from about 20 ° to about 50 ° and 00 °, respectively, relative to a horizontal axis of the insert.
In one embodiment of the present invention, each of the curved nose portions has a radius in the range of from about 0.4 mm to about 1.2 mm. In an embodiment according to the present invention, the through hole comprises a mouth portion and a series of stepped portions for fitting an insert screw.
In an embodiment according to the present invention, the angle of the chamfer depends on the thickness of the drilling insert and is preferably around 300 in relation to a vertical axis of the drilling insert.
In an embodiment according to the present invention, the upper surface has been provided with a projecting part around the mouth portion.
In an embodiment of the present invention, the corner of the cutting surface of the insert forms an angle in the range from about 00 to about 110 relative to a vertical axis of the drill insert, to enable a play between the insert and the pocket.
The foregoing summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrated aspects, embodiments, and features described above, additional aspects, embodiments, and features will be explained with reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ANNEXED FIGURES New properties and characteristics of the invention are presented in the appended claims. However, the invention itself, as well as a preferred mode of use and further objects and advantages thereof, will be best understood by reference to the following detailed description of an illustrative embodiment, when read in conjunction with the accompanying figures. One or more embodiments will now be described, by way of example only, with reference to the accompanying drawings, in which like reference numerals denote like elements and in which: FIG. 1 shows a perspective view from above of an example of a drilling insert in accordance with the present invention, FIG. 2 shows a perspective view from below of the drilling insert in FIG. 1, 10 15 20 25 30 FIG. 3 shows a top view of the drilling insert in FIG. 1, FIG. 4 shows a side view of the drilling insert in FIG. 1, FIG. 5 shows a drilling body in accordance with the present invention, with the drilling insert in FIG. 1 arranged in its circumferentially shaped pocket and a conventional insert in its central pocket, FIG. 6 shows a divided view of the drilling tool in FIG. 5, with the drilling insert of FIG. 1 arranged in the på cc placed on the circumference of the drill body.
The figures show embodiments according to the invention only in illustration. A person skilled in the art will readily understand from the following description that alternative embodiments of the structures and methods described in this text may be practiced without departing from the principles of the invention described herein.
DETAILED DESCRIPTION In the foregoing, the features and technical advantages of the present invention have been broadly described so that the following, more detailed description of the invention may be better understood. Additional features and advantages of the invention, which constitute the object of the claims relating to the invention, will be described below. It should be clear to those skilled in the art that the concept and specific embodiment presented can be used without difficulty as a starting point for modifications or for the design of other structures with the same embodiments as the present invention. It should also be apparent to those skilled in the art that such equivalent constructions do not go beyond the spirit and scope of the invention, as described in the appended claims. The new features considered to be characteristic of the invention, both in terms of its composition and operating procedure, together with additional objects and advantages will be better understood by means of the following description when considered in conjunction with the accompanying figures. However, it is to be unequivocally understood that each of the features is provided for illustrative and descriptive purposes only and is not intended as a definition of the limitations of the present invention.
To overcome the disadvantages previously mentioned in the background description, a square, indexable drill insert has been developed. An example of a drill insert according to the present invention consists of four identical cutting edges, which comprise a number of partial edges, which lead the collars to the center of the drill body, which helps to prevent the drill body from drifting from its centered position during drilling.
FIG. 1-4 show views of an exemplary embodiment with an example of a drilling insert (100) according to the present invention. FIG. 5 and 6 show views of an exemplary drill body (502) according to the present invention, with the example of drill insert (100). The drilling insert (100) includes an upper surface (101) and a lower surface (201) and side surfaces (102) adjacent the upper and lower surfaces (101 and 201).
The upper surface (101) of the drill bit (100) is larger than the lower surface (201) to provide positive play between the drill bit (100) and a hole (602) [FIG. 6] in a drill body (502) [FIG. 5 and 6]. As shown in FIG. 1 and 3, the edges (103) of the upper surface (101) are divided into a plurality of partial edges (104, 106, 108 and 109) to direct the forces to the drill shaft (504) and thereby prevent the drift of the drill body (502) from its centered location.
With further reference to FIG. 1 and 3, it is shown that the first partial edge (104) of each cutting edge (103) is directed inwardly toward the center axis of the drill bit (100) and forms an angle (u) ranging from about 0.50 to about 1, 50 in relation to the horizontal (according to the orientation shown in FIG. 3) the axis (BB) of the drilling insert (100). In an exemplary embodiment, the angle (ot) of the first partial edge (104) is 10 relative to the horizontal axis (B-B) of the drill bit (100). The second partial edge (106) is linked to that of the first partial edges (104) adjacent by a convex curve (105). The second partial edge (106) forms an angle (ß) which is in the range from about 50 to about 150 relative to the horizontal axis (B-B) of the drill bit (100). In an exemplary embodiment, the angle (ß) of the second partial edge (106) is 60 relative to the horizontal axis (B-B) of the drill bit (100). The second partial edge (106) is tangential to an inscribed circle (301) in the drill insert (100). The third partial edge (108) is linked to the second partial edge (106) by a concave curve (107a). The third partial edge (108) is linear and generally extends in the direction away from the center of the drill bit (100), forming an angle (s) ranging from about 200 to about 500 relative to the horizontal axis (BB) of drilling insert (100). In an exemplary embodiment, the angle (s) of the third partial edge (108) is 340 relative to the horizontal axis (B-B) of the drill bit (100). The fourth partial edge (109) is linked to the third partial edge (108) by a convex curve (107b). The fourth partial edge (109) is linear and generally extends in the direction away from the center of the drill insert (100), forming an angle of 00 relative to the horizontal axis (BB) of the drill insert (100), and is thus parallel to this. Furthermore, a corner (110) of the cutting edge (103) has a corner radius (R), and each corner (110) of the cutting edge (103) to which the corner belongs links together the fourth partial edge (109) of an edge ( With the first partial edge (104) of a subsequent cutting edge (103). The radius of curvature of each corner (110) depends on the thickness of the drill bit (100) and the diameter of the inscribed circle (301). The angle radius is in the range from about 0.4 mm to about 1.2 mm.
The provision of a third partial edge (108) between the concave curve (107a) and the convex curve (107b) on the drill insert (100) enables better and smoother chip formation. This prevents chips from splitting into fragments. Consequently, only a complete chip is formed along the entire cutting edge (103) and removal is accomplished through a groove (503) [FIG. 5].
In one embodiment of the present invention, the first partial edges (104) and the second partial edges (106) are directed inwardly towards the inscribed circle (301) at an angle (ot and ß), where the respective inclination is positive, i.e. the first and second partial edges are lifted from the horizontal axis (B-B) of the drill insert (100).
The drilling insert (100) further includes a hole (111) extending from the upper surface (101) of the drilling insert (100) to its lower surface (201), for mounting the insert (100) to the drill body (502) [ FIG. 5]. provided around the hole (111) on the upper surface (101) and that a series of stepped portions (11 1b) are provided around the circumference of the hole (1111), for receiving the insert screw (601) [FIG.
Referring to FIG. 1 shows a mouth portion (11a) 6] for mounting the drilling insert (100) in the pocket (602) on the drill body (502), as shown in FIG. 5.
In one embodiment of the present invention, a protruding portion (113) [FIGS. 1 and 4] is provided on the upper surface (101) of the drill bit (100). Said protruding part (113) facilitates cutting / fragmentation of the chip resulting from the drilling process and guides the chip to the helical groove (503) in the drill body (502) to facilitate removal of chips.
The side surfaces (102) of the drill bit (100) include a plurality of projecting members (114) [FIG. 2] for locking the drill bit (100) within the hole (602) in the drill body (502). The protruding parts (114) come into contact with the walls of the shaft (602) and stop the rotating movement of the drill insert (100) inside the pocket (602). Furthermore, the corners (102a) on the side surface (102) form an angle (xp) which is in the range from about 00 to about 150 relative to the vertical axis (AA) of the drilling insert (100), to facilitate play between the insert (100). and the pocket (602). According to one aspect of the present invention, the corner angle ( | /) is 110 relative to the vertical axis (A-A) of the drill bit (100). This game is a primary game that helps to easily remove the insert (100) from the hole (602) in the drill body (500) [FIG. 5].
FIG. 3 and 4 are exemplary embodiments showing views of the drilling insert (100) from above and below. The division of the cutting edges into a number of partial edges (104, 106, 108 and 109) is clearly illustrated in the view of the drilling insert (100) from above. The partial edges (104, 106, 108 and 109) with a concave curve (107a) and convex curves (105 and 107b) direct the cutting forces towards the center of the drill body (502) or towards the drill shaft (504), which prevents the drill from drifting. from its centered position. The partial edges (104, 106, 108 and 109) vary in size or length depending on whether the diameter of the inscribed circle (301) is increased to fit different sizes of inserts, and thus vary proportionally in relation to increasing size. In one embodiment, the first partial edge (104) and the second partial edge (106) together constitute a length ranging from about 30% to about 60% of the total length of the cutting edge (103), and the length of the fourth partial edge (109) ranges from about 30% to about 60% of the total length of the cutting edge (103).
According to one aspect of the present invention, the length of the third partial edge (108) ranges from about 0.5% to about 5% of the diameter of the inscribed circle (301) in the drill bit (100). According to one aspect of the present invention, the length of the third partial edge is 1.5% of the diameter of the inscribed circle (301) in the drill insert (100).
Furthermore, a chamfer (112) is provided at the lower edges of the drilling insert (100) against the bottom portion (201), as shown in FIG. 4, to facilitate the secondary play of the bet (100). The angle (y) of the chamfer (112) depends on the thickness of the insert (100), and the angle (y) is in the range from about 250 to about 450 relative to the vertical axis (A-A) of the drill insert (100). According to one aspect of the present invention, the bevel angle 300 is relative to the vertical axis (A-A) of the drill bit (100). The chamfer (112) prevents burial in the trench (602) [FIG. 6] in the drill body (502), which in turn eliminates wear of the shaft (602) when the drill insert (100) is in operation. The chamfer (112) also eliminates the wear of the surface of the borehole by the drill insert (100) when the diameter of the borehole falls below the predetermined limit.
In one embodiment, the drill insert (100) is used in the hole (602) located on the circumference of the drill body (502). The corner / nose portions (110) on the cutting edges (103) enlarge the hole created by the insert in the inner pocket (602) of the drill body (502).
FIG. 5 is an exemplary embodiment illustrating the drill body with the drill insert of the present invention in its circumferentially shaped pocket (602) and a conventional insert in its central pocket. The drilling tool (500) includes a shaft (501) of predetermined length and a drill bit (502) having a basic cylindrical shape.
The drill body comprises (503) a pair of insert pockets, one in the center and the other formed on the circumference, for placement of the drill inserts. The drill body (502) also includes a helical groove (503) along its circumference, for removal of the chips created during drilling. The chips created during the housing are cut by the protruding part (111) of the drilling insert (100) and led away via the helical groove (503) in the drill body (502) for removal of chips. In one embodiment, an inner / central insert and an outer / circumferential insert are inserted into the drill body (502) in such a manner that the forces generated during drilling are directed toward the drill shaft (504), which prevents the drill body (502) from drifting from its centered position.
In an embodiment of the present invention, the internal drilling insert initially applies moderate shear forces during drilling, after which the external / circumferentially shaped insert begins drilling in the workpiece.
FIG. 6 is an exemplary embodiment, showing a view which is partly an exploded view of the drilling tool (500) with a drilling insert (100) according to the present invention, which is depicted exploded from the circumferentially formed hole (602) in the drill body (502). When the drill insert (100) is inserted into the circumferentially shaped hole (602) in the drill body (502), the shape of the pocket (602) is adapted to the shape of the drill insert (100).
The circumferentially formed shaft (602) further comprises a threaded hole (without numeral designation) for attaching the drill insert (100) to the drill body (502) by means of an insert screw (601). The insert screw (601) comprises a series of stepped parts and a threaded part which passes through the through hole (109) of the drilling insert (100) and secures this insert in the circumferentially formed hole (602). In addition, the drill body (500) includes a conventional insert in its central pocket.
Advantages The present invention provides a square, indexable drilling insert, in which all four cutting edges are used separately for drilling, i.e. when one edge becomes worn, the next edge can be used for cutting.
The present invention provides a square, indexable drill insert having four identical cutting edges, which are divided into a plurality of partial edges, to direct the forces toward the drill shaft (504), which eliminates the drift of the drill from its centered position. .
The present invention provides a square, indexable drill bit which has a chamfer in its lower part, which prevents the insert from abrading the drilled hole.
The present invention provides a square, indexable drilling insert, which has a protruding portion on its upper surface, for breaking up the chips generated during the drilling process.
The present invention provides a square, indexable drill insert, which has a partial edge inserted between the concave curve and the convex curve of the drill, to enable better and smoother chip formation, thereby improving the drill quality.
Equivalents Regarding the use of terms in the main plural form and / or singular form in this text, a person skilled in the field can translate from plural to singular and / or from singular to plural in accordance with the context and / or application. The different variants of singularis and pluralis have been used in this text only for the sake of clarity.
It should be clear to those skilled in the art that the terms commonly used in this text, and in particular in the appended claims (eg the term bodies in the appended claims) are generally intended to be "open" terms (ie the term "Includes" should be interpreted as "includes but is not limited to", the term "has" should be interpreted as "has at least", the term "includes" should be interpreted as "includes but is not limited to" etc.). It should further be clear to persons in the art that if a specific number is referred to in the enumeration in a patent claim, such an intention will be explicitly mentioned in the patent claim, and in the absence of such a mention there is no such intention.
As an aid to understanding, for example, the following appended claims may include the use of the introductory phrases "at least one" and "one or more" to introduce enumerations in the claims. However, the existence of such phrases should not be construed as an introduction to an enumeration in a claim where the indefinite articles "a" or "an" are used instead, limiting a particular patent claim with this type of introduction to enumeration in the claim to inventions containing only one such enumerated entity, even when the same claims include both the introductory phrases "one or more" or "at least one" and indefinite articles such as "one" or "one" (eg, typically "one" and / or or "one" is interpreted as meaning "at least one" or "one or ﬂ era"); the same applies to the use of certain articles used to introduce enumerations in the claims. In addition, even if a specific number is expressly referred to in the introduction to an enumeration in a patent claim, those skilled in the art will appreciate that such enumeration should typically be construed as referring to at least the enumerated number (e.g., only an enumeration of “Two enumerated units” without other modifying words typically means at least two enumerated units or two or ﬂ your enumerated units). Furthermore, in those instances where a convention analogous to "at least one of A, B and C etc." used, such a design generally refers to the meaning by which a person skilled in the art would interpret the Convention (eg "a system having at least one of A, B and C" would include, but not be limited to, a system has only A, only B, only C, both A and B, both A and C, both B and C and / or both A, B, and C, etc.). In cases where a convention analogous to "at least one of A, B, or C, etc." used, such a design generally refers to the meaning by which a person skilled in the art would interpret the Convention (eg, "a system having at least one of A, B or C" would include, but is not limited to, a system which has only A, only B, only C, both A and B, both A and C, both B and C and / or both A, B, and C, etc. _). It should also be clear to those skilled in the art that virtually every distinctive word and / or phrase presenting two or ﬂ your alternative terms - whether in the description, in the claims or in the drawings - should be understood as considering the possibility. to include one of the terms, any of the terms or both terms. The phrase "A or B" is interpreted, for example, to include the possibilities "A" or "B", or "A and B." While various aspects and embodiments have been presented in this text, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments presented in this text are for illustrative purposes only and are not intended to be limiting, and the true scope and spirit are indicated in the following claims.
It should be noted here that the claims refer to all the components described above, either individually or in any type of combination, as these are crucial to the invention, which applies in particular to the elements depicted in the drawings, and which have the reference numbers in the drawings given. below.
Reference number: Reference number Description 100 Drill insert 101 Upper surface of drill insert 102 Side surfaces of drill insert 102a Corner of cutting surfaces 103 Cutting edges 104 First, partial edges 105 Convex curve 106 Second, partial edges 108 Third, partial edges l07a Concave curve 107b Convex curve 109 partial edges 1 10 Nose portion 1 1 1 Through hole 111a Orifice part 111b of the through hole Step-shaped portions 1 12 Bevel 1 13 Protruding part on upper surface 14 114 Protruding parts on side surfaces 201 Lower surface on drill insert 301 Thought, inscribed circle diameter 501 Shaft back piece 50 503 Spiral groove in the drill body 601 Insertion screw 602 Circumferentially shaped ﬁ also in the drill body AA Vertical axis of the drill insert BB Horizontal axis angle of the first partial edge angle Second partial edge angle

权利要求:
Claims (11)
[1]
A square, indexable drill insert (100), comprising: a substantially planar upper surface (101) and a lower surface (201), a side surface (102) adjacent the upper and lower surfaces (101 and 201) of four of the sides on the drill insert (100), the lower surface (201) being smaller than the upper surface (101) to provide positive cutting geometry; four identical cutting edges (103) on the side surface (102), which meet the upper surface (101), each of the cutting edges (103) comprising: a first partial edge (104) directed inwardly towards the central axis of the drilling insert (100), when the first partial edge (104) is provided from the nearest corner of the drill insert (100); a second partial edge (106) linked to the first partial edge (104) by a convex curve (105), said second partial edge (106) being tangential to an imaginary, inscribed circle (301) about the axis of the insert (BB) ; a third partial edge (108) extending away from the central axis of the drill bit (100), when the third partial edge (108) is seen from the corner furthest from the drill bit (100), and which is linked to the second partial edge (106 ) through a concave curve (107a) and a fourth partial edge (109) extending away from the central axis of the drilling insert (100), when the fourth partial edge (109) is seen from the corner furthest from the drilling insert (100), and which is linked to the third partial edge (108) by a convex curve (107b); a plurality of curved muzzles (110) having a predetermined radius, each located at one of the respective four corners of the insert (100) and linking the first partial edge (104) of a cutting edge with the fourth partial edge (109). of a subsequent cutting edge (103); a through hole (111) disposed in the center of the drill insert (100) extending between the upper surface (101) and the lower surface (201) of the drill insert (100), for mounting the insert (100) to a drill body (500) ) and a bevel (112) provided at the lower edge (201) of the drill insert (100).
[2]
2.. The drilling insert of claim 1, wherein the first partial edge (104) is linear and inclined at an angle (ot) ranging from about 0.50 to about 5 ° relative to a horizontal axis (BB) of the drilling insert (100). .
[3]
3.. The drill bit of claim 1, wherein the second partial edge (106) is linear and inclined at an angle (ß) ranging from about 5 ° to about 150 relative to a horizontal axis (B-B) of the drill bit (100).
[4]
4.. The drill bit of claim 1, wherein the third partial edge (108) is linear and inclined at an angle (α) ranging from about 20 ° to about 50 ° relative to a horizontal axis (B-B) of the drill bit (100).
[5]
5.. Drilling insert according to claim 1, wherein the fourth partial edge (109) is linear and inclined at an angle (fD) of 0 ° relative to a horizontal axis (B-B) of the drilling insert (100).
[6]
6.. Drilling insert according to claim 1, wherein each of the curved nose portions (11) has a radius (R) ranging from about 0.4 mm to about 1.2 mm.
[7]
7.. Drilling insert according to claim 1, wherein the through hole (111) comprises an orifice portion (11la) and a series of stepped portions (111b) for receiving an insert screw.
[8]
8.. Drilling insert according to claim 1, wherein an angle (y) of the bevel (112) is in the range from about 0 ° to about 45 ° relative to a vertical axis of the drilling insert (100), depending on the thickness of the drilling insert (100). 17
[9]
Drilling insert according to claim 1, wherein the through hole (111) comprises a mouth portion (11a 1a) arranged near the upper surface (101) and wherein the upper surface (101) is provided with a projecting part (113) around the mouth portion. (1 1 la). 5
[10]
Drilling insert according to claim 1, wherein corners (102a) on the side surfaces (102) of the drilling insert (100) form an angle (xp) which is in the range from approximately 00 to approximately 110 relative to a vertical axis of the drilling insert (100).
[11]
Drill body (500) comprising a square, indexable drill insert (100) according to claim 1, mounted in its circumferentially formed shaft (602), and an insert mounted in its central shaft. 15

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同族专利:

公开号 | 公开日

CN103447591A|2013-12-18|

US20130315684A1|2013-11-28|

US9993881B2|2018-06-12|

DE102013105347B4|2021-03-25|

CN103447591B|2020-02-28|

KR20130133141A|2013-12-06|

JP2013244596A|2013-12-09|

JP6319950B2|2018-05-09|

DE102013105347A1|2013-11-28|

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法律状态:
2015-09-22| NAV| Patent application has lapsed|

优先权:

申请号 | 申请日 | 专利标题

IN2114CH2012|2012-05-28|

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