WEATHERFORD U.S., INC.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 1383
 
  
 
F16K VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING172
 
  
 
G01L MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE 155

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
5735359 Wellbore cutting toolJun 10, 96Apr 07, 98[E21B]
5626189 Wellbore milling tools and insertsSep 22, 95May 06, 97[E21B]
5584350 Wellbore sidetracking methodsSep 22, 95Dec 17, 96[E21B]
5577566 Releasing toolAug 09, 95Nov 26, 96[E21B]
5531271 Whipstock side supportMar 31, 95Jul 02, 96[E21B]
5452759 Whipstock systemSep 10, 93Sep 26, 95[E21B]
5429187 Milling tool and operationsMar 18, 94Jul 04, 95[E21B]
5425417 Wellbore tool setting systemSep 06, 94Jun 20, 95[E21B]
5411049 ValveMar 18, 94May 02, 95[F16K]
5409060 Wellbore tool orientationApr 04, 94Apr 25, 95[E21B]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5614599 Stilbene-based polyester and polycarbonate compositionsExpiredOct 13, 95Mar 25, 97[C08F]
5464062 Metal-to-metal sealable portExpiredOct 12, 94Nov 07, 95[E21B]
5245877 Tong load cell assemblyExpiredMar 12, 91Sep 21, 93[G01L]
5113940 Well apparatuses and anti-rotation device for well apparatusesExpiredMay 15, 91May 19, 92[E21B]
5095929 Rail tank car cleaning systemExpiredDec 20, 90Mar 17, 92[B08B]
5081888 Apparatus for connecting and disconnecting threaded membersExpiredNov 27, 89Jan 21, 92[B25B]
5044232 Active jaw for a power tongExpiredNov 28, 89Sep 03, 91[B25B]
5025858 Well apparatuses and anti-rotation device for well apparatusesExpiredMay 02, 90Jun 25, 91[E21B]
4984633 Nozzle effect protectors, centralizers, and stabilizers and related methodsExpiredOct 20, 89Jan 15, 91[E21B]
4979562 Float equipment including float collars and modular plugs for well operationsExpiredOct 21, 88Dec 25, 90[E21B]
4895056 Tong and belt apparatus for a tongExpiredNov 28, 88Jan 23, 90[B25B]
4842062 Hydraulic lock alleviation device, well cementing stage tool, and related methodsExpiredFeb 05, 88Jun 27, 89[E21B]
4811800 Flexible drill string member especially for use in directional drillingExpiredOct 22, 87Mar 14, 89[B23P, E21B]
4794986 Reticulated centralizing apparatusExpiredNov 27, 87Jan 03, 89[E21B]
4787458 Spring bow, centralizer, and related methodsExpiredMay 29, 87Nov 29, 88[E21B]
4774860 Tong and belt apparatus for a tongExpiredSep 24, 86Oct 04, 88[B25B]
4756365 Cementing plugExpiredSep 04, 86Jul 12, 88[E21B]
4717290 Milling toolExpiredDec 17, 86Jan 05, 88[E21B]
4711301 Valve assembly for inflatable packerExpiredSep 05, 85Dec 08, 87[E21B]
4706747 Cementing plugExpiredNov 25, 85Nov 17, 87[E21B]

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Top Inventors for This Owner

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