WESTERN COMPANY OF NORTH AMERICA, THE, A CORP. OF DE

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 195

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5099922 Control of gas flow through cement columnMar 26, 91Mar 31, 92[E21B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5232497 Clay control additive for cement compositions and method of cementingExpiredApr 30, 92Aug 03, 93[C04B]
5116421 High temperature fluid loss additive for cement slurry and method of cementingExpiredDec 12, 90May 26, 92[C04B, E21B]
5054552 Breaker system for aqueous fluids containing xanthan gumsExpiredAug 31, 90Oct 08, 91[E21B]
4735268 Mechanical setting toolExpiredOct 02, 86Apr 05, 88[E21B]
4679624 Hydraulic setting toolExpiredSep 09, 85Jul 14, 87[E21B]
4588509 Proppant concentratorExpiredFeb 17, 84May 13, 86[B04C]
4579668 Well servicing agents and processesExpiredMay 27, 83Apr 01, 86[C09K, E21B]
4535915 Delivery and metering device for granulated and powdered materialsExpiredJul 22, 83Aug 20, 85[G01F]
4534870 Crosslinker composition for high temperature hydraulic fracturing fluidsExpiredJun 28, 82Aug 13, 85[C09K, E21B]
4474204 Delivery and metering device control systemExpiredJul 22, 83Oct 02, 84[G05D]
4448535 Apparatus for blending additives into a liquidExpiredDec 15, 81May 15, 84[E21B]

Top Inventors for This Owner

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