Patents by Inventor Anakkavur T. Santhanam
Anakkavur T. Santhanam has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7147939Abstract: A coated carbide tap comprises a substrate consisting of tungsten carbide cemented with 12 to 16% by weight cobalt with additions of small amounts of transition metal carbides added to restrain grain growth, and may also contain low levels of impurities that might be picked up during processing. The substrate is coated with a layer of metal nitrides, carbides, carbonitrides, borides and/or oxides, the metal being chosen from one or more of the following: aluminum, silicon and the transition metals from Groups IVa, Va, and VIa of the Periodic Chart. The coating may comprise a monolayer and/or alternating layers optionally with varying chemical composition.Type: GrantFiled: February 27, 2003Date of Patent: December 12, 2006Assignees: Kennametal Inc., Yamawa Manufacturing Ltd.Inventors: Willard E. Henderer, Anakkavur T. Santhanam, Sadayuki Akaki
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Patent number: 6866921Abstract: A coated cemented (binder alloy, e.g., cobalt-chromium alloy) tungsten carbide cutting insert that comprises a substrate and a coating. The substrate contains at least about 70 weight percent tungsten and carbon, between about 3 weight percent and about 12 weight percent cobalt, and at least 0.09 weight percent chromium. The substrate presents a surface zone of binder alloy enrichment that begins near (or at) and extends inwardly from a peripheral surface of the substrate. The coating includes a base layer that contains chromium.Type: GrantFiled: March 7, 2003Date of Patent: March 15, 2005Assignee: Kennametal Inc.Inventors: George P. Grab, Mark S. Greenfield, Anakkavur T. Santhanam
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Publication number: 20040170872Abstract: A coated carbide tap comprises a substrate consisting of tungsten carbide cemented with 12 to 16% by weight cobalt with additions of small amounts of transition metal carbides added to restrain grain growth, and may also contain low levels of impurities that might be picked up during processing. The substrate is coated with a layer of metal nitrides, carbides, carbonitrides, borides and/or oxides, the metal being chosen from one or more of the following: aluminum, silicon and the transition metals from Groups IVa, Va, and VIa of the Periodic Chart. The coating may comprise a monolayer and/or alternating layers optionally with varying chemical composition.Type: ApplicationFiled: February 27, 2003Publication date: September 2, 2004Inventors: Willard E. Henderer, Anakkavur T. Santhanam, Sadayuki Akaki
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Publication number: 20030161695Abstract: A coated cemented (binder alloy, e.g., cobalt-chromium alloy) tungsten carbide cutting insert that comprises a substrate and a coating. The substrate contains at least about 70 weight percent tungsten and carbon, between about 3 weight percent and about 12 weight percent cobalt, and at least 0.09 weight percent chromium. The substrate presents a surface zone of binder alloy enrichment that begins near (or at) and extends inwardly from a peripheral surface of the substrate. The coating includes a base layer that contains chromium.Type: ApplicationFiled: March 7, 2003Publication date: August 28, 2003Inventors: George P. Grab, Mark S. Greenfield, Anakkavur T. Santhanam
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Patent number: 6554548Abstract: A coated cemented (binder alloy, e.g., cobalt-chromium alloy) tungsten carbide cutting insert that comprises a substrate and a coating. The substrate contains at least about 70 weight percent tungsten and carbon, between about 3 weight percent and about 12 weight percent cobalt, and at least 0.09 weight percent chromium. The substrate presents a surface zone of binder alloy enrichment that begins near (or at) and extends inwardly from a peripheral surface of the substrate. The coating includes a base layer that contains chromium.Type: GrantFiled: August 11, 2000Date of Patent: April 29, 2003Assignee: Kennametal Inc.Inventors: George P. Grab, Mark S. Greenfield, Anakkavur T. Santhanam
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Patent number: 5395680Abstract: Provided is a coated cutting tool having a coating and a substrate. The coating includes at least one CVD layer which may have a residual tensile stress and at least one layer having a high residual compressive stress. The outermost layer of the coating is preferably the one containing residual compressive stresses. The substrate is a composite having hard refractory grains.Type: GrantFiled: July 2, 1993Date of Patent: March 7, 1995Assignee: Kennametal Inc.Inventors: Anakkavur T. Santhanam, Rajendra V. Godse, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal
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Patent number: 5364209Abstract: Provided is a coated cutting tool having a coating and a substrate. The coating includes at least one chemical vapor deposited (CVD) layer and at least one physical vapor deposited (PVD) layer. The outermost layer of the coating is a PVD layer, containing residual compressive stresses. The substrate is a composite having hard refractory grains bonded together by a binder material.Type: GrantFiled: January 14, 1994Date of Patent: November 15, 1994Assignee: Kennametal Inc.Inventors: Anakkavur T. Santhanam, Rajendra V. Godse, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal
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Patent number: 5325747Abstract: Provided is a coated cutting tool having a coating and a substrate. The coating includes at least one CVD layer which may have a residual tensile stress and at least one layer having a high residual compressive stress. The outermost layer of the coating is preferably the one containing residual compressive stresses. The substrate is a composite having hard refractory grains. The cutting tool has been found to be particularly useful in the machining of titanium alloys and superalloys.Type: GrantFiled: August 13, 1992Date of Patent: July 5, 1994Assignee: Kennametal Inc.Inventors: Anakkavur T. Santhanam, Rajendra V. Godse, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal, Roger A. Baillargeon, William D. Ewald
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Patent number: 5266388Abstract: Provided is a coated cutting tool having a binder enriched substrate. The coating includes at least one CVD layer which may be in a state of residual tensile stress and at least one layer in a state of residual compressive stress.Type: GrantFiled: August 29, 1991Date of Patent: November 30, 1993Assignee: Kennametal Inc.Inventors: Anakkavur T. Santhanam, Rajendra V. Godse, George P. Grab, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal
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Patent number: 5250367Abstract: Provided is a coated cutting tool having a binder enriched substrate. The coating includes at least one chemical vapor deposited (CVD) layer and at least one physical vapor deposited (PVD) layer. The PVD layer contains residual compressive stresses.Type: GrantFiled: September 17, 1990Date of Patent: October 5, 1993Assignee: Kennametal Inc.Inventors: Anakkavur T. Santhanam, Rajendra V. Godse, George P. Grab, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal
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Patent number: 5232318Abstract: Provided is a coated cutting tool having a coating and a substrate. The coating includes at least one CVD layer which may have a residual tensile stress and at least one layer having a high residual compressive stress. The outermost layer of the coating is preferably the one containing residual compressive stresses. The substrate is a composite having hard refractory grains.Type: GrantFiled: August 29, 1991Date of Patent: August 3, 1993Assignee: Kennametal Inc.Inventors: Anakkavur T. Santhanam, Rajendra V. Godse, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal
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Patent number: 5188489Abstract: A coated indexable cutting insert for wet and dry milling of cast irons is provided. The substrate of the insert is composed of a cemented tungsten carbide based composition containing about 5.7 to about 6.4 weight percent cobalt and about 2.9 to about 3.6 weight percent tantalum. The coating includes two coatings of differing composition. The first coating is selected from titanium carbide, titanium carbonitride, and titanium nitride. The second coating is alumina.Type: GrantFiled: May 31, 1991Date of Patent: February 23, 1993Assignee: Kennametal Inc.Inventors: Anakkavur T. Santhanam, Rajendra V. Godse
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Patent number: 5143488Abstract: Provided is a coated cutting tool having a coating and a substrate. The coating includes at least one chemical vapor deposited (CVD) layer and at least one physical vapor deposited (PVD) layer. The outermost layer of the coating is a PVD layer, containing residual compressive stresses. The substrate is a composite having hard refractory grains bonded together by a binder material.Type: GrantFiled: September 17, 1990Date of Patent: September 1, 1992Assignee: Kennametal Inc.Inventors: Anakkavur T. Santhanam, Rajendra V. Godse, Dennis T. Quinto, Kenneth E. Undercoffer, Prem C. Jindal
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Patent number: 4942097Abstract: A cermet cutting tool is provided having a composition containing the following: about 3.5 to about 6.5 w/o (weight percent) nickel; about 4.5 to about 7.5 w/o cobalt, wherein the sum of nickel plus cobalt is between about 8 to 11 w/o; about 20 to about 25 w/o tungsten; about 5 to about 11 w/o molybdenum; up to about 6 w/o tantalum plus niobium; up to about 0.05 w/o chromium; up to about 1 w/o aluminum; and up to about 3 w/o vanadium; with the remainder being essentially titanium, carbon, and nitrogen, wherein at least substantially all the carbon and nitrogen are present as metal compounds selected from the group consisting of metal carbonitrides and mixtures of metal carbonitrides and metal carbides where said metal is selected from the group consisting of tungsten, molybdenum, titanium, tantalum, niobium, vanadium, chromium, their solid solutions and there mixtures.Type: GrantFiled: October 14, 1987Date of Patent: July 17, 1990Assignee: Kennametal Inc.Inventors: Anakkavur T. Santhanam, Edward V. Conley