US20140319898A1 - Radial cutter bit with cutting insert having edge preparation - Google Patents
Radial cutter bit with cutting insert having edge preparation Download PDFInfo
- Publication number
- US20140319898A1 US20140319898A1 US13/871,012 US201313871012A US2014319898A1 US 20140319898 A1 US20140319898 A1 US 20140319898A1 US 201313871012 A US201313871012 A US 201313871012A US 2014319898 A1 US2014319898 A1 US 2014319898A1
- Authority
- US
- United States
- Prior art keywords
- cutting edge
- face
- land
- relief
- land surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/18—Mining picks; Holders therefor
- E21C35/19—Means for fixing picks or holders
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Milling Processes (AREA)
Abstract
A radial cutter bit includes a non-rotatable shank portion, a head portion including a tip region distal from the non-rotatable shank portion, and a cutting insert mounted at the tip region of the head portion. The cutting insert includes a body having a leading face, an opposing trailing face, a first side and a second side. The leading face has a central face portion, a first side face portion extending toward the first side of the body and a second face portion extending toward the second side of the body. The cutting insert further includes a top surface having a relief surface, a T-land surface extending between at least a portion of the leading face and the relief surface of the top surface and a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.
Description
- The invention pertains generally to an excavating tool such as, for example, a cutter bit useful for cutting through various earth strata and other materials. More specifically, the invention pertains to a radial cutter bit with a cutting insert having edge preparation.
- Various types of cutting assemblies having cutter bits are used for mining, construction and related operations wherein, typically, the cutter bits include a shank for insertion into a tool holder and a forward working portion on the shank for engagement with earth strata, e.g., coal, or mineral formation or other natural materials or the like. An individual insert formed of a hard, wear resistant material is provided on the forward working portion to cut into the earth strata and to enhance the life of the cutter bit as it removes the material.
- An example of a cutting assembly having cutter bits that are used for mining and construction operations is a radial cutter tool. These types of cutting tools usually include a plurality of cutter bits mounted on a rotatable disc, rake, chain, barrel or drum, wherein each of the cutter bits include a substantially-flat cutting insert made of a hard material. These substantially-flat cutting inserts are affixed to the forward working end of the cutter bits. However, it has been determined that due to the shape and configuration of the substantially-flat cutter inserts, the cutter inserts do not wear uniformly. This non-uniform wear decreases the overall useful life of the cutting inserts. More particularly, the cutting edge of the substantially-flat cutter inserts have a tendency to chip or break during use due to the shape of the cutting edge.
- Accordingly, it would be desirable to provide improved cutting tools that overcome limitations and disadvantages of known such tools. In addition, it would be desirable to provide improved cutter bits that overcome limitations and disadvantages of known cutter bits and that provide for improved wear and efficiency during operation. Furthermore, it would be desirable to provide improved cutting inserts for cutter bits that overcome limitations and disadvantages of known cutting inserts and that provide for improved wear and efficiency during operation.
- In accordance with an aspect of the invention, a radial cutter bit for engaging an earth strata material includes a non-rotatable shank portion, a head portion integrally formed with the non-rotatable shank portion and including a tip region distal from the non-rotatable shank portion, and a cutting insert mounted at the tip region of the head portion. The cutting insert includes a body having a leading face, an opposing trailing face, a first side and a second side. The leading face has a central face portion, a first side face portion extending toward the first side of the body and a second face portion extending toward the second side of the body. The cutting insert further includes a top surface having a relief surface, a T-land surface extending between at least a portion of the leading face and the relief surface of the top surface and a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.
- In accordance with another aspect of the invention, a cutting insert for use in connection with a cutter bit for engaging an earth strata material includes a body having a leading face, an opposing trailing face, a first side and a second side. The leading face has a central face portion, a first side face portion extending toward the first side of the body and a second face portion extending toward the second side of the body. The cutting insert further includes a top surface having a relief surface, a T-land surface extending between at least a portion of the leading face and the relief surface of the top surface and a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.
- These and other aspects of the present invention will be more fully understood following a review of this specification and drawings.
-
FIG. 1 is a side view of a cutter bit, e.g. a radial cutter bit, in accordance with an aspect of the invention. -
FIG. 2 is a front view of the cutter bit shown inFIG. 1 , in accordance with an aspect of the invention. -
FIG. 3 is a front view of a cutting insert for use with the cutter bit shown inFIGS. 1 and 2 , in accordance with an aspect of the invention. -
FIG. 4 is a top view of the cutting insert shown inFIG. 3 , in accordance with an aspect of the invention. -
FIG. 4A is a sectional view taken alongline 4A-4A ofFIG. 4 , in accordance with another aspect of the invention. -
FIG. 4B is a sectional view taken alongline 4B-4B ofFIG. 4 , in accordance with another aspect of the invention. -
FIG. 4C is a sectional view taken alongline 4C-4C ofFIG. 4 , in accordance with another aspect of the invention. - The following description is for purposes of illustrating various aspects of the invention only and not for purposes of limiting the scope of the invention.
- Referring to
FIGS. 1-4C , there is illustrated a cutter bit in the form of, for example, a radial cutter bit generally designated as 10, and a cutting insert generally designated as 22 for use therewith. Theradial cutter bit 10 includes ashank portion 12 that is non-rotatable, i.e. theshank portion 12 does not rotate during operation once theradial cutter bit 10 is assembled by inserting theshank portion 12 of theradial cutting tool 10 into a tool holder base (not shown). In one aspect, theshank portion 12 has a generally non-circular cross-section, e.g. a generally rectangular cross-section. - The
radial cutter bit 10 includes a forward working end that includes ahead portion 14 integrally formed with theshank portion 12 and having atip region 16 distal from theshank portion 12. Thecutting insert 22 is mounted at thetip region 16 of thehead portion 14. Thecutting insert 22 is typically mounted or affixed to thehead portion 14 by, for example, attaching mechanically or otherwise, via brazing, gluing, or press fitting using conventional compositions and techniques known to those skilled in the art. - The
cutting insert 22 is made from, for example, a cemented tungsten carbide that is a mixture of cobalt and tungsten carbide. Other super hard, wear resistant materials such as polycrystalline diamond, ceramics, or cermet may be used as a supplement and/or substitute. For example chromium carbide-coated metals and other cermets where titanium carbide or vanadium carbide is added to tungsten carbide may be candidates for inserts materials in accordance to aspects of the invention. Alternate ceramics for such applications include aluminum-based, silicon based, zirconium-based and glass varieties. Still other insert materials alternatives include cubic refractory, transition metal carbides or any other known or subsequently developed material(s) harder than the base material. Also coatings of the inserts such as PVD or CVD coatings can be used. - In one aspect, the
cutting insert 22 is made, for example, with a powder metallurgy process using a press comprising of a die and top and bottom ram/punch to press the complete shape. Parts can be pressed to finished shape or modified with a wet/dry blast, or diamond ground other material shaping processes such as but not limited to EDM (electrical discharge machining), EDG (electrical discharge grinding), green machining, laser ablation into final shapes. Advantageously, the invention provides for moving the critical cutting edge of the insert from the intersection of the die case and ram during manufacturing. In accordance with an aspect of the invention, the critical cutting edge is now formed entirely in the ram/punch. This eliminates the flash from forming on the cutting edge. Flash is undesirable because, for example, it is a stress concentrator. It will be appreciated that these and other aspects of the invention as set forth herein contribute to the desired edge, i.e. cutting edge, preparation for the cutting insert. -
Cutting insert 22 has a cutting insert body, generally designated as 24, that has atop surface 26, abottom surface 28, afirst side portion 34 and asecond side portion 36. Thecutting insert body 24 also includes a leadingface 40 and an opposite rearward ortrailing face 42. - The leading
face 40 includes acentral face portion 40 a, a firstside face portion 40 b extending toward thefirst side portion 34 of thebody 24 and a secondside face portion 40 c extending toward thesecond side portion 36 of thebody 24. In one aspect, thecentral face portion 40 a is contiguous and non-coplanar with the firstside face portion 40 b. In another aspect, thecentral face portion 40 a is contiguous and non-coplanar with the secondside face portion 40 c. - The
top surface 26 of thecutting insert 22 includes arelief surface 44. In one aspect, therelief surface 44 extends toward the rearward ortrailing face 42 of thecutting insert 22. In another aspect, therelief surface 44 extends to the rearward ortrailing face 42. In another aspect, the relief surface is generally curved or arcuate. - In accordance with another aspect of the invention, the
cutting insert 22 includes edge preparation such as a T-land surface, generally designated as 48, extending generally between at least a portion of the leadingface 40 and therelief surface 44 of thetop surface 26. In one aspect, the T-land surface 48 includes a central T-land surface 48 a extending between thecentral face portion 40 a of the leadingface 40 and therelief surface 44 of thetop surface 26, a first side T-land surface 48 b extending between the firstside face portion 40 b of the leadingface 40 and therelief surface 44 of thetop surface 26 and a second side T-land surface 48 c extending between the secondside face portion 40 c of the leadingface 40 and therelief surface 44 of thetop surface 26. In one aspect, the central T-land surface 48 a, the first side T-land surface 48 b and the second side T-land surface 48 c are contiguous with each other to provide for a continuous T-land surface 48. In one aspect, the central T-land surface 48 a is contiguous with thecentral face portion 40 a, the first side T-land surface 48 b is contiguous with the firstside face portion 40 b and the second side T-land surface 48 c is contiguous with the secondside face portion 40 c. In another aspect, the central T-land surface 48 a is contiguous with therelief surface 44, the first side T-land surface 48 b is contiguous with therelief surface 44 and the second side T-land surface 48 c is contiguous with therelief surface 44. It will be appreciated that the T-land surface(s) 48 may be planar surfaces or other than a planar surface, such as, for example it may include a rounded or curved, i.e. non-planar, T-land surface. - The cutting
insert 22 further includes acutting edge 50 formed at the intersection of the T-land surface 48 and therelief surface 44 of thetop surface 26. In one aspect, thecutting edge 50 includes acentral cutting edge 50 a formed at the intersection of the central T-land surface 48 a and therelief surface 44 of thetop surface 26, a firstside cutting edge 50 b formed at the intersection of the first side T-land surface 48 b and therelief surface 44 of thetop surface 26 and a secondside cutting edge 50 c formed at the intersection of the second side T-land surface 48 c and therelief surface 44 of thetop surface 26. In another aspect, thecentral cutting edge 50 a, the firstside cutting edge 50 b and the secondside cutting edge 50 c are contiguous with each other to provide for acontinuous cutting edge 50. In another aspect, thecentral cutting edge 50 a, the firstside cutting edge 50 b and the secondside cutting edge 50 c may be rounded or curved. - The configuration of having the
central cutting edge 50 a formed at the intersection of the central T-land surface 48 a and therelief surface 44 provides for thecutting edge 50 a to have a negative axial rake angle Ra (see, for example,FIG. 4A ). In one aspect, the negative axial rake angle Ra is in the range of about 10 degrees to about 60 degrees. In one specific example, the rake angle Ra shown inFIG. 4A is about negative 35 degrees. - The central T-
land surface 48 a is positioned relative to therelief surface 44 at an angle Xa (see, for example,FIG. 4A ). The angle Xa may be referred to as a relief angle relative to or in relation to cuttingedge 50 a. In one aspect, the T-land surface 48 a is positioned relative to therelief surface 44 at an angle Xa that is greater than 90 degrees. In one specific example, the angle Xa shown inFIG. 4A is about 110 degrees. - In another aspect, the central T-
land surface 48 a may have a width Wa (see, for example,FIG. 4A ) in the range of about 0.002 inches to about 0.090 inches. In one specific example, the width Wa is about 0.010 inches. - The configuration of having the first
side cutting edge 50 b formed at the intersection of the first side T-land surface 48 b and therelief surface 44 provides for thecutting edge 50 b to have a negative axial rake angle Rb (see, for example,FIG. 4B ). In one aspect, the negative axial rake angle Rb is in the range of about 10 degrees to about 60 degrees. In one specific example, the rake angle Rb shown inFIG. 4B is about negative 50 degrees. - The first side T-
land surface 48 b is positioned relative to therelief surface 44 at an angle Xb (see, for example,FIG. 4B ). The angle Xb may be referred to as a relief angle relative to or in relation to cuttingedge 50 b. In one aspect, the first side T-land surface 48 b is positioned relative to therelief surface 44 at an angle Xb that is greater than 90 degrees. In one specific example, the angle Xb shown inFIG. 4B is about 125 degrees. - In another aspect, the first side T-
land surface 48 b may have a width Wb (see, for example,FIG. 4B ) in the range of about 0.002 inches to about 0.090 inches. In one specific example, the width Wb is about 0.015 inches. - The configuration of having the second
side cutting edge 50 c formed at the intersection of the second side T-land surface 48 c and therelief surface 44 provides for thecutting edge 50 c to have a negative axial rake angle Rc (see, for example,FIG. 4C ). In one aspect, the negative axial rake angle Rc is in the range of about 10 degrees to about 60 degrees. In one specific example, the rake angle Rc shown inFIG. 4C is about negative 50 degrees. - The second side T-
land surface 48 c is positioned relative to therelief surface 44 at an angle Xc (see, for example,FIG. 4C ). The angle Xc may be referred to as a relief angle relative to or in relation to cuttingedge 50 c. In one aspect, the second side T-land surface 48 c is positioned relative to therelief surface 44 at an angle Xc that is greater than 90 degrees. In one specific example, the angle Xc shown inFIG. 4C is about 125 degrees. - In another aspect, the second side T-
land surface 48 c may have a width Wc (see, for example,FIG. 4C ) in the range of about 0.002 inches to about 0.090 inches. In one specific example, the width Wc is about 0.015 inches. - It will be appreciated that the configuration of the T-land(s) 48, cutting edge(s) 50, negative axial rake angle(s) R and/or the relief angle(s) X individually and/or in combination advantageously avoid a sharp transition for the cutting edge(s) 50 so as to reduce or minimize the possibility of the cutting edge 50(s) breaking or chipping during operation of the
cutter bit 10. In addition, the T-land(s) 48 is configured so as to redirect the cutting forces along the cutting edge(s) 50 to reduce the shear stress along the cutting edge(s) 50. - Whereas particular aspects of this invention have been described above for purposes of illustration, it will be evident to those skilled in the art that numerous variations of the details of the present invention may be made without departing from the invention as defined in the appended claims.
Claims (17)
1. A radial cutter bit for engaging an earth strata material, the radial cutter bit comprising:
a non-rotatable shank portion;
a head portion integrally formed with the non-rotatable shank portion and including a tip region distal from the non-rotatable shank portion; and
a cutting insert mounted at the tip region of the head portion, wherein the cutting insert comprises:
a body having a leading face, an opposing trailing face, a first side and a second side;
the leading face having a central face portion, a first side face portion extending toward the first side of the body and a second face portion extending toward the second side of the body;
a top surface having a relief surface;
a T-land surface extending between at least a portion of the leading face and the relief surface of the top surface; and
a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.
2. The radial cutter bit of claim 1 , wherein the T-land surface includes a central T-land surface extending between the central face portion of the leading face and the relief surface of the top surface.
3. The radial cutter bit of claim 2 , wherein the cutting edge includes a central cutting edge formed at the intersection of the central T-land surface and the relief surface of the top surface.
4. The radial cutter bit of claim 3 , wherein the central cutting edge has a negative axial rake angle.
5. The radial cutter bit of claim 1 , wherein the T-land surface includes a first side T-land surface extending between the first side face portion of the leading face and the relief surface of the top surface.
6. The radial cutter bit of claim 5 , wherein the cutting edge includes a first side cutting edge formed at the intersection of the first side T-land surface and the relief surface of the top surface.
7. The radial cutter bit of claim 6 , wherein the first side cutting edge has a negative axial rake angle.
8. The radial cutter bit of claim 1 , wherein the T-land surface includes a second side T-land surface extending between the second side face portion of the leading face and the relief surface of the top surface.
9. The radial cutter bit of claim 8 , wherein the cutting edge includes a second side cutting edge formed at the intersection of the second side T-land surface and the relief surface of the top surface.
10. The radial cutter bit of claim 9 , wherein the second side cutting edge has a negative axial rake angle.
11. A cutting insert for use in connection with a cutter bit for engaging an earth strata material, the cutting insert comprising:
a body having a leading face, an opposing trailing face, a first side and a second side;
the leading face having a central face portion, a first side face portion extending toward the first side of the body and a second face portion extending toward the second side of the body;
a top surface having a relief surface;
a T-land surface extending between at least a portion of the leading face and the relief surface of the top surface; and
a cutting edge formed at the intersection of the T-land surface and the relief surface of the top surface.
12. The cutting insert of claim 11 , wherein the T-land surface includes a central T-land surface extending between the central face portion of the leading face and the relief surface, the cutting edge includes a central cutting edge formed at the intersection of the central T-land surface and the relief surface, and the central cutting edge has a negative axial rake angle.
13. The cutting insert of claim 12 , wherein the T-land surface includes a first side T-land surface extending between the first side face portion of the leading face and the relief surface, the cutting edge includes a first side cutting edge formed at the intersection of the first side T-land surface and the relief surface, and the first side cutting edge has a negative axial rake angle.
14. The cutting insert of claim 13 , wherein the T-land surface includes a second side T-land surface extending between the second side face portion of the leading face and the relief surface, the cutting edge includes a second side cutting edge formed at the intersection of the second side T-land surface and the relief surface, and the second side cutting edge has a negative axial rake angle.
15. The cutting insert of claim 12 , wherein the negative axial rake angle of the central cutting edge is in the range of about 10 degrees to about 60 degrees.
16. The cutting insert of claim 13 , wherein the negative axial rake angle of the first side cutting edge is in the range of about 10 degrees to about 60 degrees.
17. The cutting insert of claim 14 , wherein the negative axial rake angle of the second side cutting edge is in the range of about 10 degrees to about 60 degrees.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/871,012 US20140319898A1 (en) | 2013-04-26 | 2013-04-26 | Radial cutter bit with cutting insert having edge preparation |
AU2014201700A AU2014201700A1 (en) | 2013-04-26 | 2014-03-21 | Radial cutter bit with cutting insert having edge preparation |
DE102014105399.0A DE102014105399A1 (en) | 2013-04-26 | 2014-04-15 | Radial milling drill bit with cutting insert with edge preparation |
CN201410166529.0A CN104121019A (en) | 2013-04-26 | 2014-04-24 | Radial cutter bit with cutting insert having edge preparation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/871,012 US20140319898A1 (en) | 2013-04-26 | 2013-04-26 | Radial cutter bit with cutting insert having edge preparation |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140319898A1 true US20140319898A1 (en) | 2014-10-30 |
Family
ID=51685168
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/871,012 Abandoned US20140319898A1 (en) | 2013-04-26 | 2013-04-26 | Radial cutter bit with cutting insert having edge preparation |
Country Status (4)
Country | Link |
---|---|
US (1) | US20140319898A1 (en) |
CN (1) | CN104121019A (en) |
AU (1) | AU2014201700A1 (en) |
DE (1) | DE102014105399A1 (en) |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2618335A1 (en) * | 1976-04-27 | 1977-11-03 | Titanit Bergbautechnik Gmbh & | Coal pick and support block - has stems of main and auxiliary picks fitting into recesses in support |
US4194790A (en) * | 1974-04-24 | 1980-03-25 | Coal Industry (Patents) Ltd. | Rock cutting tip inserts |
DE3315624C1 (en) * | 1983-04-29 | 1984-11-15 | Fa. Astrid Komotzki, 4600 Dortmund | Cutter body for coal ploughs |
US4674802A (en) * | 1982-09-17 | 1987-06-23 | Kennametal, Inc | Multi-insert cutter bit |
US4903609A (en) * | 1988-09-23 | 1990-02-27 | Kennametal Inc. | Tamping blade with improved inserts |
US5297853A (en) * | 1993-03-29 | 1994-03-29 | The Sollami Company | Insert for radial cutter |
US5319855A (en) * | 1991-11-30 | 1994-06-14 | Hydra Tools International Plc | Mineral cutter tip and pick |
US6270164B1 (en) * | 1997-11-14 | 2001-08-07 | Bauer Spezialtiefbau Gmbh | Cutting tooth for earthworking |
US7578080B2 (en) * | 2005-10-25 | 2009-08-25 | Bauer Maschinen Gmbh | Cutting tooth for a ground working implement |
US8789894B2 (en) * | 2009-01-13 | 2014-07-29 | Diamond Innovations, Inc. | Radial tool with superhard cutting surface |
-
2013
- 2013-04-26 US US13/871,012 patent/US20140319898A1/en not_active Abandoned
-
2014
- 2014-03-21 AU AU2014201700A patent/AU2014201700A1/en not_active Abandoned
- 2014-04-15 DE DE102014105399.0A patent/DE102014105399A1/en not_active Ceased
- 2014-04-24 CN CN201410166529.0A patent/CN104121019A/en active Pending
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4194790A (en) * | 1974-04-24 | 1980-03-25 | Coal Industry (Patents) Ltd. | Rock cutting tip inserts |
DE2618335A1 (en) * | 1976-04-27 | 1977-11-03 | Titanit Bergbautechnik Gmbh & | Coal pick and support block - has stems of main and auxiliary picks fitting into recesses in support |
US4674802A (en) * | 1982-09-17 | 1987-06-23 | Kennametal, Inc | Multi-insert cutter bit |
DE3315624C1 (en) * | 1983-04-29 | 1984-11-15 | Fa. Astrid Komotzki, 4600 Dortmund | Cutter body for coal ploughs |
US4903609A (en) * | 1988-09-23 | 1990-02-27 | Kennametal Inc. | Tamping blade with improved inserts |
US5319855A (en) * | 1991-11-30 | 1994-06-14 | Hydra Tools International Plc | Mineral cutter tip and pick |
US5297853A (en) * | 1993-03-29 | 1994-03-29 | The Sollami Company | Insert for radial cutter |
US6270164B1 (en) * | 1997-11-14 | 2001-08-07 | Bauer Spezialtiefbau Gmbh | Cutting tooth for earthworking |
US7578080B2 (en) * | 2005-10-25 | 2009-08-25 | Bauer Maschinen Gmbh | Cutting tooth for a ground working implement |
US8789894B2 (en) * | 2009-01-13 | 2014-07-29 | Diamond Innovations, Inc. | Radial tool with superhard cutting surface |
Also Published As
Publication number | Publication date |
---|---|
CN104121019A (en) | 2014-10-29 |
DE102014105399A1 (en) | 2014-10-30 |
AU2014201700A1 (en) | 2014-11-13 |
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AS | Assignment |
Owner name: KENNAMETAL INC., PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:PAROS, NICHOLAS J.;GEORGE, STEPHEN M.;SHEFFLER, GLENN W.;AND OTHERS;SIGNING DATES FROM 20130423 TO 20130425;REEL/FRAME:030291/0469 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |