US20100018776A1 - Cutting bit for mining and excavating tools - Google Patents

Cutting bit for mining and excavating tools Download PDF

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Publication number
US20100018776A1
US20100018776A1 US12/180,584 US18058408A US2010018776A1 US 20100018776 A1 US20100018776 A1 US 20100018776A1 US 18058408 A US18058408 A US 18058408A US 2010018776 A1 US2010018776 A1 US 2010018776A1
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US
United States
Prior art keywords
cutting bit
diameter
extended collar
cutting
insert
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
Application number
US12/180,584
Inventor
Donald E. Keller
Michael Lee Bilyeu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kennametal Inc
Original Assignee
Kennametal Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kennametal Inc filed Critical Kennametal Inc
Priority to US12/180,584 priority Critical patent/US20100018776A1/en
Assigned to KENNAMETAL INC. reassignment KENNAMETAL INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BILYEU, MICHAEL LEE, KELLER, DONALD E.
Publication of US20100018776A1 publication Critical patent/US20100018776A1/en
Application status is Abandoned legal-status Critical

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C35/00Miscellaneous items relating to machines for slitting or completely freeing the mineral from the seam
    • E21C35/18Mining picks; Holders therefor
    • E21C35/183Mining picks; Holders therefor with inserts or layers of wear-resistant material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28DWORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B28D1/186Tools therefor, e.g. having exchangeable cutter bits

Abstract

A wear-resistant cutting bit for use on a mining or excavating cutting tool is disclosed. The cutting bit utilizes a hardened insert having a narrow base attached to the remainder of the cutting bit. An extended collar of the hardened insert projects from the cutting bit and ends with a generally conical section. The extended collar and narrow base of the hardened insert enable the cutting bits of the present invention to be more wear-resistant and cost-effective than other cutting bits used on mining and excavating equipment.

Description

    FIELD OF THE INVENTION
  • The present invention relates to mining and excavating tools and, more particularly, is concerned with a cutting bit designed for erosion resistance.
  • BACKGROUND INFORMATION
  • Mining and excavating tools often employ drums and the like on which are mounted many cutting bits. Each cutting bit typically has a hard wear-resistant tip made of a material such as tungsten carbide attached to a generally conical steel head of the bit. A problem with such designs is that the softer steel head material erodes during cutting operations. This is commonly referred to as “steel wash”.
  • Wear-resistant cutting bits have been developed in order to increase erosion resistance. U.S. Pat. No. 4,725,098 to Beach discloses the deposition of a hard-facing material about the steel nose of a cutting bit. U.S. Pat. No. 5,417,475 to Graham et al. discloses the installation of a ring of hard material on the front surface of a steel nose of a cutting bit. U.S. Pat. No. 6,709,065 to Peay et al. discloses the use of a ledge of hard material mounted near the steel nose of a cutting bit. Published U.S. Application No. 2005/0035649 to Mercier et al. discloses the installation of hard wear rings on a stepped shoulder of a cutting bit.
  • Despite these known designs, a need still exists for cutting bits which exhibit improved wear resistance thereby extending the life of the bit and reducing operating costs.
  • The present invention has been developed in view of the foregoing.
  • SUMMARY OF THE INVENTION
  • The present invention provides a wear-resistant cutting bit for use on a mining or excavating cutting tool. The cutting bit utilizes a hardened insert having a narrow base attached to the remainder of the cutting bit. An extended collar of the hardened insert projects from the cutting bit and ends with a generally conical section. The extended collar and narrow base of the hardened insert enable the cutting bits of the present invention to be more wear-resistant and cost-effective than other cutting bits used on mining and excavating equipment.
  • An aspect of the present invention provides an insert for a cutting bit comprising a forward most generally conical portion, an extended collar adjacent and rearward of the generally conical portion, the extended collar portion having a diameter and an axial length, a tapered transition segment and a reduced diameter base.
  • Another aspect of the present invention provides a cutting bit comprising a forward portion and a shank oriented about a longitudinal axis, the forward portion having a socket, a hardened insert affixed to the socket of the forward portion, the hardened insert comprising a generally conical portion adjacent an extended collar adjacent and transition segment adjacent a reduced diameter base, wherein the reduced diameter base and transition section fit into the socket of the forward portion.
  • These and other aspects will become more apparent from the following description.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is an exploded, oblique view of a cutting bit and bit holder comprising a base block and sleeve according to one embodiment of the present invention.
  • FIG. 2 is a side view of a cutting bit with a section of the nose cut away around the hardened tip.
  • FIG. 3 is a side view of a hardened tip according to one embodiment of the present invention.
  • FIG. 4 is a side view of a cutting bit with a hardened ring about the forward portion according to one embodiment of the present invention.
  • FIG. 5 is a side view of a cutting bit with a hardened ring about the forward portion according to one embodiment of the present invention.
  • DETAILED DESCRIPTION
  • Referring now to FIG. 1, a cutting assembly 1 is shown. The cutting assembly 1 includes a base block 10 which mounts onto a rotating drum or other piece of equipment. A sleeve 20 fits inside an opening 12 in the base block 10. Cutting bit 30 inserts into a bore 22 of the sleeve 20. Sleeve 20 and cutting bit 30 may be secured to the opening 12 and bore 22 through appropriate means known to those skilled in the art, for example, by press fitting, by using a retainer ring or other fastening means.
  • Referring now to FIG. 2, a more detailed side view of the cutting bit 30 according to one embodiment of the present invention is shown. Cutting bit 30 may have a shank 40 and forward portion 50 separated by a flared collar 60. The cutting bit 30 may be situated about a longitudinal axis 2. The cutting bit 30 has an axially forward end 70 and an axially rearward 80 in relation to the longitudinal axis 2. At the axially forward end 70 of the cutting bit 30 is a hardened insert 100 located into a socket 90 in the forward portion 50 of the cutting bit 30.
  • Hardened insert 100 may be any number of wear materials, including tungsten carbide, titanium carbide and tantalum carbide, aluminum oxide, titanium nitride, cobalt, cubic boron nitride, polycrystalline diamond, and may include other ceramics, and alloys and cermets of these materials. Hardened insert 100 is typically made of cemented tungsten carbide and is brazed into the socket 90 or attached by any other method known to those skilled in the art.
  • In the embodiment shown in FIG. 2, the shank 40 of the cutting bit 30 has a retainer 42 near the axially rearward end 80. This retainer 42 provides a seating surface for press fitting the cutting bit 30 into the sleeve 20.
  • Referring now to FIG. 3, the hardened insert 100 will now be described in more detail. At the axially forward end 70 the hardened insert 100 has generally conical portion 110 ending at a cutting tip 120. As used herein the phrase “generally conical” desribes a portion of the cutting tip being shaped like a cone and includes frustoconical and pyramidal shapes. Rearward of the generally conical section 110 is an extended collar 130. Rearward of the extended collar 130 is an inwardly tapering transition segment 140. Rearward of the transition segment 140 is a reduced diameter base 150. The reduced diameter base 150 may be any suitable shape, for example cylindrical and/or conical. As used herein, phrase “reduced diameter” describes a diameter of the base of the hardened insert being of lesser diameter than the diameter of the extended collar of the hardened insert. The reduced diameter base 150 may be about 85% to about 35%, for example about 70% of the diameter of the extended collar 130. The extended collar 130 may have an extended collar diameter 132 of about 15 mm to about 35 mm, for example about 25 mm. Although, the embodiment in FIG. 3, shows a reduced diameter base having a uniform diameter, non-uniform shapes of varying diameter are also contemplated.
  • The reduced diameter base 150 enables the forward portion 50 to withstand a significant amount of wear before resulting in cutting bit failure. Forward portion 50 and shank portion are typically made of carbon steel. Still referring to FIG. 3, a wear area 52 is illustrated by the phantom line 53. This is a high wear area 52 in cutting bits. The relatively soft carbon steel of the forward end abrades much faster than the hardened insert 100. Due to the reduced diameter of the base 150, the wider extended collar 130 and conical section 110 protect the base 150 and the steel of the forward portion 50 adjacent to the base 150 from much abrasion. This maintains the integrity of the steel and brazing securing the hardened insert for a much longer time than would be achievable with an insert of uniform diameter.
  • Hardened inserts 100 typically wear along the generally conical portion 110 at an angle of 90° to 120°, for example 110°. The wear angle, denoted 0, is illustrated in FIG. 3. As described above, the hardened insert 100 has an extended collar 130 designed to extend useful life of the cutting bit 30. The extended collar 130 may be generally cylindrical and has an axial length 134 illustrated in FIG. 3. The axial length 134 may be about 5 mm to about 35 mm, for example about 10 mm. As a consequence, the hardened insert 100 is able to wear from the cutting tip 120 position shown in FIG. 3 through to position A. In most instances, the reduced diameter base 150 allows wear of the cutting bit 30 even beyond position A before the cutting bit 150 ultimately fails.
  • In one embodiment of the present invention shown in FIG. 4, the cutting bit 200 has a hardened exterior surface placed about the nose 252 of the forward portion 250. In this embodiment, the hardened exterior surface is a sheath 220 made from cemented tungsten carbide. The nose 252 may be slightly recessed about the periphery of the forward portion 250 to accommodate the sheath 220 or the sheath 220 may be fit over an unrecessed periphery of the nose 252. The sheath 220 may be affixed to the forward portion 250 by brazing or other known method.
  • Another embodiment incorporating a hardened exterior surface about the nose 352 of the forward portion of the cutting bit 300 is shown in FIG. 5. In this embodiment, the nose 352 of the forward portion 350 has a wear-resistant exterior comprising a hardfacing weld 354. In the embodiments shown in FIGS. 4-5 the exterior of the nose 252, 352 has been hardened to at least a hardness 50 RWc. In other embodiments, the forward portion may be made from a hardened or alloy steel to provide wear-resistance.
  • In addition to exceptional life, the cutting bits of the present invention have shown an ability to reduce sparking during mining operations. At times, the atmosphere in underground mines can become combustible. It is therefore desirable to reduce ignition sources, such as sparks, in mining equipment.
  • Test results demonstrating the performance of the cutting bits according to one embodiment of the present invention have shown a 3:1 improvement in wear. Tests of the cutting bits of the present invention were performed on a single continuous mining machine having two drums. One drum was equipped with standard cutting bits while the second drum was equipped with cutting bits of the present invention. The test setup ensured the standard cutting bits and the cutting bits of the present invention where used under identical conditions, e.g. the material cut, time in operation and rate of cutting. The cutting bits were run until failure. The standard cutting bits lasted for one 8-hour shift while the cutting bits of present invention cut for three 8-hour shifts.
  • Some improvement in the life of the bits was expected due to a slight increase in the amount of material used in the inserts of the present invention compared to standard cutting bits. However, a 3:1 increase in cutting bit life exceeded expectation considering a less than 2:1 increase in hardened material was added to the cutting bits.
  • Whereas particular embodiments 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 (18)

1. An insert for a cutting bit comprising:
a generally conical portion;
an extended collar adjacent and rearward of the generally conical portion, the extended collar portion having a diameter and an axial length;
a tapered transition segment adjacent the extended collar; and
a reduced diameter base adjacent the tapered transition segment.
2. The insert for a cutting bit of claim 1, wherein the reduced diameter base has a diameter which is about 35% to about 85% of the diameter of the extended collar.
3. The insert for a cutting bit of claim 1, wherein the reduced diameter base has a diameter which is about 70% of the diameter of the extended collar.
4. The insert for a cutting bit of claim 1, wherein the hardened bit is made from cemented tungsten carbide.
5. The insert for a cutting bit of claim 1, wherein the extended collar has a diameter of about 15 mm to about 35 mm.
6. The insert for a cutting bit of claim 1, wherein the extended collar has a diameter of about 25 mm.
7. The insert for a cutting bit of claim 1, wherein the extended collar has an axial length of about 5 mm to about 35 mm.
8. The insert for a cutting bit of claim 1, wherein the extended collar has an axial length of about 10 mm.
9. A cutting bit comprising:
a forward portion and a shank oriented about a longitudinal axis, the forward portion having a socket;
a hardened insert affixed to the socket of the forward portion, the hardened insert comprising a generally conical portion adjacent an extended collar adjacent and transition segment adjacent a reduced diameter base,
wherein the reduced diameter base and transition section fit into the socket of the forward portion.
10. The a cutting bit of claim 9, wherein the reduced diameter base has a diameter which is about 35% to about 85% of the diameter of the extended collar.
11. The cutting bit of claim 9, wherein the reduced diameter base has a diameter which is about 70% of the diameter of the extended collar.
12. The cutting bit of claim 9, wherein the hardened bit is made from cemented tungsten carbide.
13. The cutting bit of claim 9, wherein the extended collar has a diameter of about 15 mm to about 35 mm.
14. The cutting bit of claim 9, wherein the extended collar has a diameter of about 25 mm.
15. The cutting bit of claim 9, wherein the extended collar has an axial length of about 5 mm to about 35 mm.
16. The cutting bit of claim 9, wherein the extended collar has an axial length of about 10 mm.
17. The cutting bit of claim 9, wherein the hardened insert is affixed to the socket by brazing.
18. The cutting bit of claim 9, further comprising a wear-resistant sheath affixed to the forward portion.
US12/180,584 2008-07-28 2008-07-28 Cutting bit for mining and excavating tools Abandoned US20100018776A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/180,584 US20100018776A1 (en) 2008-07-28 2008-07-28 Cutting bit for mining and excavating tools

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US12/180,584 US20100018776A1 (en) 2008-07-28 2008-07-28 Cutting bit for mining and excavating tools
AU2009277014A AU2009277014A1 (en) 2008-07-28 2009-06-29 Cutting bit for mining and excavating tools
PCT/US2009/049028 WO2010014327A2 (en) 2008-07-28 2009-06-29 Cutting bit for mining and excavating tools

Publications (1)

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US20100018776A1 true US20100018776A1 (en) 2010-01-28

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US12/180,584 Abandoned US20100018776A1 (en) 2008-07-28 2008-07-28 Cutting bit for mining and excavating tools

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US (1) US20100018776A1 (en)
AU (1) AU2009277014A1 (en)
WO (1) WO2010014327A2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016164919A1 (en) * 2015-04-10 2016-10-13 Joy Mm Delaware, Inc. Cutting bit and extraction tool for same
USD780558S1 (en) * 2016-01-11 2017-03-07 Supplier Of Solutions, Llc Tool support sleeve
US20170254201A1 (en) * 2014-10-17 2017-09-07 Vermeer Manufacturing Company Protective wear sleeve for cutting element
USD818507S1 (en) 2017-02-28 2018-05-22 Kennametal Inc Replaceable tip for a rotatable cutting tool
USD863386S1 (en) 2018-06-06 2019-10-15 Kennametal Inc. Ribbed cutting insert

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US3830546A (en) * 1973-03-01 1974-08-20 Kennametal Inc Mining tool and support block therefor
US4497520A (en) * 1983-04-29 1985-02-05 Gte Products Corporation Rotatable cutting bit
US4627665A (en) * 1985-04-04 1986-12-09 Ss Indus. Cold-headed and roll-formed pick type cutter body with carbide insert
US4725099A (en) * 1985-07-18 1988-02-16 Gte Products Corporation Rotatable cutting bit
US4725098A (en) * 1986-12-19 1988-02-16 Kennametal Inc. Erosion resistant cutting bit with hardfacing
US4865392A (en) * 1985-07-18 1989-09-12 Gte Products Corporation Rotatable cutting bit
US4911504A (en) * 1988-07-20 1990-03-27 Kennametal Inc. Cutter bit and tip
US4911503A (en) * 1988-07-20 1990-03-27 Kennametal Inc. Earth engaging cutter bit
US4938538A (en) * 1983-03-23 1990-07-03 Santrade Limited Excavating tool cutting insert
US4981328A (en) * 1989-08-22 1991-01-01 Kennametal Inc. Rotatable tool having a carbide insert with bumps
US5219209A (en) * 1992-06-11 1993-06-15 Kennametal Inc. Rotatable cutting bit insert
US5324098A (en) * 1992-12-17 1994-06-28 Kennametal Inc. Cutting tool having hard tip with lobes
US5415462A (en) * 1994-04-14 1995-05-16 Kennametal Inc. Rotatable cutting bit and bit holder
US5702160A (en) * 1995-02-16 1997-12-30 Levankovskii; Igor Anatolyevich Tool for crushing hard material
US6051079A (en) * 1993-11-03 2000-04-18 Sandvik Ab Diamond coated cutting tool insert
US6196636B1 (en) * 1999-03-22 2001-03-06 Larry J. McSweeney Cutting bit insert configured in a polygonal pyramid shape and having a ring mounted in surrounding relationship with the insert
US6199956B1 (en) * 1998-01-28 2001-03-13 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz-Simon Gmbh & Co. Kg Round-shank bit for a coal cutting machine
US6199451B1 (en) * 1996-09-09 2001-03-13 The Sollami Company Tool having a tungsten carbide insert
US6270165B1 (en) * 1999-10-22 2001-08-07 Sandvik Rock Tools, Inc. Cutting tool for breaking hard material, and a cutting cap therefor
US6354771B1 (en) * 1998-12-12 2002-03-12 Boart Longyear Gmbh & Co. Kg Cutting or breaking tool as well as cutting insert for the latter
US6375272B1 (en) * 2000-03-24 2002-04-23 Kennametal Inc. Rotatable cutting tool insert
US6508318B1 (en) * 1999-11-25 2003-01-21 Sandvik Ab Percussive rock drill bit and buttons therefor and method for manufacturing drill bit
US20040026983A1 (en) * 2002-08-07 2004-02-12 Mcalvain Bruce William Monolithic point-attack bit
US6986552B1 (en) * 2003-11-03 2006-01-17 The Sollami Company Hardened rotary cutting tip
US20080042484A1 (en) * 2006-08-21 2008-02-21 Majagi Shivanand I Cutting bit body and method for making the same
US20080169698A1 (en) * 2006-08-11 2008-07-17 Hall David R Carbide Stem Press Fit into a Steel Body of A Pick
US20080315667A1 (en) * 2006-08-11 2008-12-25 Hall David R Braze Thickness Control
US20090146490A1 (en) * 2007-12-05 2009-06-11 Sandvik Intellectual Property Ab Breaking or excavating tool with cemented tungsten carbide insert and ring
US20090174252A1 (en) * 2008-01-08 2009-07-09 Esco Corporation Tip for an earth working roll

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3830546A (en) * 1973-03-01 1974-08-20 Kennametal Inc Mining tool and support block therefor
US4938538A (en) * 1983-03-23 1990-07-03 Santrade Limited Excavating tool cutting insert
US4497520A (en) * 1983-04-29 1985-02-05 Gte Products Corporation Rotatable cutting bit
US4497520B1 (en) * 1983-04-29 1989-01-17
US4627665A (en) * 1985-04-04 1986-12-09 Ss Indus. Cold-headed and roll-formed pick type cutter body with carbide insert
US4725099A (en) * 1985-07-18 1988-02-16 Gte Products Corporation Rotatable cutting bit
US4865392A (en) * 1985-07-18 1989-09-12 Gte Products Corporation Rotatable cutting bit
US4725098A (en) * 1986-12-19 1988-02-16 Kennametal Inc. Erosion resistant cutting bit with hardfacing
US4911504A (en) * 1988-07-20 1990-03-27 Kennametal Inc. Cutter bit and tip
US4911503A (en) * 1988-07-20 1990-03-27 Kennametal Inc. Earth engaging cutter bit
US4981328A (en) * 1989-08-22 1991-01-01 Kennametal Inc. Rotatable tool having a carbide insert with bumps
US5219209A (en) * 1992-06-11 1993-06-15 Kennametal Inc. Rotatable cutting bit insert
US5324098A (en) * 1992-12-17 1994-06-28 Kennametal Inc. Cutting tool having hard tip with lobes
US6051079A (en) * 1993-11-03 2000-04-18 Sandvik Ab Diamond coated cutting tool insert
US5415462A (en) * 1994-04-14 1995-05-16 Kennametal Inc. Rotatable cutting bit and bit holder
US5702160A (en) * 1995-02-16 1997-12-30 Levankovskii; Igor Anatolyevich Tool for crushing hard material
US6199451B1 (en) * 1996-09-09 2001-03-13 The Sollami Company Tool having a tungsten carbide insert
US6199956B1 (en) * 1998-01-28 2001-03-13 Betek Bergbau- Und Hartmetalltechnik Karl-Heinz-Simon Gmbh & Co. Kg Round-shank bit for a coal cutting machine
US6354771B1 (en) * 1998-12-12 2002-03-12 Boart Longyear Gmbh & Co. Kg Cutting or breaking tool as well as cutting insert for the latter
US6196636B1 (en) * 1999-03-22 2001-03-06 Larry J. McSweeney Cutting bit insert configured in a polygonal pyramid shape and having a ring mounted in surrounding relationship with the insert
US6270165B1 (en) * 1999-10-22 2001-08-07 Sandvik Rock Tools, Inc. Cutting tool for breaking hard material, and a cutting cap therefor
US6508318B1 (en) * 1999-11-25 2003-01-21 Sandvik Ab Percussive rock drill bit and buttons therefor and method for manufacturing drill bit
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US20040026983A1 (en) * 2002-08-07 2004-02-12 Mcalvain Bruce William Monolithic point-attack bit
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US20080042484A1 (en) * 2006-08-21 2008-02-21 Majagi Shivanand I Cutting bit body and method for making the same
US20090146490A1 (en) * 2007-12-05 2009-06-11 Sandvik Intellectual Property Ab Breaking or excavating tool with cemented tungsten carbide insert and ring
US20090174252A1 (en) * 2008-01-08 2009-07-09 Esco Corporation Tip for an earth working roll

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170254201A1 (en) * 2014-10-17 2017-09-07 Vermeer Manufacturing Company Protective wear sleeve for cutting element
WO2016164919A1 (en) * 2015-04-10 2016-10-13 Joy Mm Delaware, Inc. Cutting bit and extraction tool for same
WO2016164905A1 (en) * 2015-04-10 2016-10-13 Joy Mm Delaware, Inc. Bit assembly for cutter head
US9874095B2 (en) 2015-04-10 2018-01-23 Joy Mm Delaware, Inc. Cutting bit and extraction tool for same
USD780558S1 (en) * 2016-01-11 2017-03-07 Supplier Of Solutions, Llc Tool support sleeve
USD818507S1 (en) 2017-02-28 2018-05-22 Kennametal Inc Replaceable tip for a rotatable cutting tool
USD863386S1 (en) 2018-06-06 2019-10-15 Kennametal Inc. Ribbed cutting insert

Also Published As

Publication number Publication date
WO2010014327A2 (en) 2010-02-04
WO2010014327A3 (en) 2010-04-08
AU2009277014A1 (en) 2010-02-04

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Owner name: KENNAMETAL INC., PENNSYLVANIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KELLER, DONALD E.;BILYEU, MICHAEL LEE;REEL/FRAME:021850/0764;SIGNING DATES FROM 20081104 TO 20081110

STCB Information on status: application discontinuation

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