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United States of America Patent and Trademark Office. Granted Patents (USPTO) >
4398952
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Inventor
Drake Eric F
Assignee
Reed Rock Bit Company
Attorney
Caddell Michael J
IPC Codes
B22F 07/06
E21B 10/58
E21B 10/50
E21B 10/52
E21B 10/46
B22F 03/14
B22F 05/08
B22F 07/02
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Patent Office: United States of America Patent and Trademark Office. Granted Patents (USPTO) 
Title: Methods of manufacturing gradient composite metallic structures
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Application No: 06/185,696
Publication No: 4398952
Application Date: 1980-09-10
Publication Date: 1983-08-16
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Abstract
A method is disclosed for forming roller cutters and also for forming cutting teeth for rolling cutter bits, including cutter inserts, cutter teeth formed in place, or formed separately and welded in place, etc., by powder metallurgy as a densified powder metallurgical composite of at least two varying phases, the composite having a substantially continuous mechanical property gradient therethrough. The gradient is from one region having hardness or wear resistant properties to another region having toughness properties. The method comprises:providing a first powder mixture comprising a major proportion by volume of a powdered refractory compound and a minor proportion by volume of a powdered binder metal or alloy. Providing a second powder comprising a powdered binder metal or alloy or a mixture comprising a powdered refractory material and a powdered binder metal or alloy, present in a lesser proportion by volume than in the first powder. Forming the cutter, or cutter teeth or inserts of the first and the second powders. Mixing the powders during or prior to the forming step and introducing into a first region of the mold a mixture having a larger proportion of the first powder relative to the second powder. Changing the relative proportions of the powders and introducing the mixture into a second region of the mold a mixture having a different proportion of the first powder relative to the second powder and a continuous gradient in the relative proportions of the powders between the regions. Densifying the powders into a solid member having a gradient in composition and properties from the first region to the second region.
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US4398952 at USPTO
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Referenced by : 62 patent(s) worldwide
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Inventor: Keshavan Madapusi K; Underwood Lance D; Kar Naresh J; Oldham Thomas W; Roth Cary A; Armstrong Brian J
Assignee: Smith International, Inc
Attorney: nullChristie, Parker & Hale
Title: Hard facing for milled tooth rock bits
Patent Office: United States of America Patent and Trademark Office. Granted Patents (USPTO) Document Number: US4836307
Referenced by: 52
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Inventor: Jacobs Robert S; Krall Jack
Assignee: Newcomer Products, Inc
Attorney: nullBuchanan Ingersoll
Title: Dispersion alloyed hard metal composites
Patent Office: United States of America Patent and Trademark Office. Granted Patents (USPTO) Document Number: US4956012
Referenced by: 30
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Inventor: Krall Jack; Olsson Anders
Assignee: Newcomer Products, Inc
Attorney: nullBuchanan Ingersoll; Dever Michael L
Title: Dispersion alloyed hard metal composites and method for producing same
Patent Office: United States of America Patent and Trademark Office. Granted Patents (USPTO) Document Number: US5423899
Referenced by: 13
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Inventor: Chow Jacob T C; Findley Sidney L; Beacco David P; Lovato Lorenzo G
Assignee: Baker Hughes Incorporated
Attorney: nullTrask, Britt & Rossa
Title: Bit manufacturing method
Patent Office: United States of America Patent and Trademark Office. Granted Patents (USPTO) Document Number: US6073518
Referenced by: 12
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Inventor: Chow Jacob T C; Findley Sidney L; Beacco David P; Lovato Lorenzo G
Assignee: Baker Hughes Incorporated
Attorney: nullTrask, Britt & Rossa
Title: Structure for use in drilling a subterranean formation
Patent Office: United States of America Patent and Trademark Office. Granted Patents (USPTO) Document Number: US6089123
Referenced by: 8
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Inventor: Overstreet James L
Assignee: Baker Hughes Incorporated
Attorney: nullTraskBritt
Title: Drill bits and drilling tools including abrasive wear-resistant materials
Patent Office: United States of America Patent and Trademark Office. Granted Patents (USPTO) Document Number: US7597159
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Inventor: Gutberlet Fred Dipl-Ing
Applicant: Hochtief Construction Ag
Title: Tool, in particular for a tunnel boring machine
Patent Office: European Patent Office (EPO) Document Number: EP1754855
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Inventor: Butcher Trent N; Smith Redd H; Findley Sidney L
Assignee: Baker Hughes Incorporated
Attorney: nullTraskBritt
Title: System for infiltrating preformed components and component assemblies
Patent Office: United States of America Patent and Trademark Office. Granted Patents (USPTO) Document Number: US6581671
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Inventor: Ishibashi Hirotaka; Hayashi Koichi; Nagayama Hiroyuki
Assignee: Toto Ltd
Attorney: nullCarrier, Blackman & Associates, PC; Carrier Joseph P; Blackman William D
Title: Gradient function material seal cap for discharge lamp bulb
Patent Office: United States of America Patent and Trademark Office. Granted Patents (USPTO) Document Number: US5972067
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Inventor: Ishibashi Hirotaka; Hayashi Koichi; Nagayama Hiroyuki
Assignee: Toto Ltd
Attorney: nullCarrier, Blackman & Associates, PC; Carrier Joseph P; Blackman William D
Title: Gradient function material
Patent Office: United States of America Patent and Trademark Office. Granted Patents (USPTO) Document Number: US5943546
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Reference cited : 10 patent(s) worldwide
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