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Roller cone drill bits with enhanced drilling stability and extended life of associated bearings and seals
   
Document Number
US Patent 7434632
Issued Date
October 14, 2008
Link
Inventors
Chen; Shilin (The Woodlands, TX)
Sui; Ping C. (The Woodlands, TX)
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Abstract
Roller cone drill bits may be formed with cutting elements and cutting structures having cutting element profile angles selected to minimize cone wobble and improve life of associated bearings and seals. Normal force axes of the cutting elements may intersect with each other as a force center. Crest points of the cutting elements may be disposed on one or more circles extending from the associated force center.
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Number of Claims:
33
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Owner
Published
October 14, 2008
Application Number
10/919,990
Filed
August 17, 2004
US Classification
175/57   175/341 175/431 76/108.2
Int'l Classification
E21B   10/16   (20060101)   E21B   10/08   (20060101)  
Examiner
Attorney/Law Firm
Parent Case
RELATED APPLICATION This application claims the benefit of previously filed provisional patent application Ser. No. 60/549,339 entitled Roller Cone Drill Bits With Enhanced Drilling Stability and Extended Life Of Associated Bearings And Seals filed date Mar. 2, 2004.
USPTO Field of Search
175/57   175/341   175/374   175/431   76/108.2  
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