NATIONAL-OILWELL, L.P.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
E21B EARTH OR ROCK DRILLING 1779
 
  
 
B25B TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING638
 
  
 
B66D CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS 318
 
  
 
F16K VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING370
 
  
 
F16J PISTONS; CYLINDERS; PRESSURE VESSELS IN GENERAL; SEALINGS248
 
  
 
B05D PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL 186
 
  
 
B65H HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES178
 
  
 
C22C ALLOYS 171
 
  
 
E02B HYDRAULIC ENGINEERING 117
 
  
 
E04C STRUCTURAL ELEMENTS; BUILDING MATERIALS 125

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
8186900 Piston rod retention systemFeb 13, 06May 29, 12[F16L, F16D]
8006751 Automated system for positioning and supporting the work platform of a mobile workover and well-servicing rigOct 08, 07Aug 30, 11[E21B]
7828533 Positive displacement motor/progressive cavity pumpJan 23, 07Nov 09, 10[F03C, F01C]
7765749 Fast moving drilling rigApr 20, 04Aug 03, 10[E21B]
7546869 Automated system for positioning and supporting the work platform of a mobile workover and well-servicing rigNov 12, 07Jun 16, 09[E21B]
7461700 Apparatus and method for a C-plate used in a cable guided fishing assemblySep 01, 05Dec 09, 08[E21B]
7455128 Automated arm for positioning of drilling tools such as an iron roughneckJun 27, 07Nov 25, 08[E21B]
7350534 Hollow ball valve assemblyFeb 14, 05Apr 01, 08[F16K]
7296640 Solids control systemMay 26, 04Nov 20, 07[E21B]
7293607 Automated system for positioning and supporting the work platform of a mobile workover and well-servicing rigJul 13, 05Nov 13, 07[E21B]

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
7523694 Cylinder liner preload systemExpiredNov 29, 05Apr 28, 09[F16J]
7345396 Metallic laminations for magnetic circuitsExpiredMar 21, 05Mar 18, 08[H02K]
7231981 Inline compensator for a floating drill rigExpiredOct 01, 04Jun 19, 07[E21B]
2007/0074,460 PORTABLE DRILLING MAST STRUCTUREAbandonedAug 09, 06Apr 05, 07[E04H]
2007/0017,704 SINGLE JOINT DRILLING SYSTEMAbandonedJul 19, 06Jan 25, 07[E21B]
2007/0011,984 Structural connector for a drilling rig substructureAbandonedSep 19, 06Jan 18, 07[E04C]
2006/0202,150 Valve assembly with angled valve guideAbandonedMar 10, 06Sep 14, 06[F16K]
2005/0245,381 Centrifuge accelerator systemAbandonedApr 30, 04Nov 03, 05[B04B]
2005/0207,272 Mud tank with pressurized compartmentAbandonedMar 18, 04Sep 22, 05[B01F]
2005/0050,988 Fabricated eccentric shaftAbandonedOct 16, 03Mar 10, 05[F16C]
2004/0051,326 Cam operated jaw force intensifier for gripping a cylindrical memberAbandonedSep 12, 03Mar 18, 04[B25J]
6634436 Mobile land drilling apparatus and methodExpiredApr 06, 00Oct 21, 03[E21B]
6588318 Hydraulic retention system for reciprocating pump cylinder linerExpiredMar 09, 01Jul 08, 03[F01B]
5846028 Controlled pressure multi-cylinder riser tensioner and methodExpiredAug 01, 97Dec 08, 98[B02B, B63B]
5425435 Brake system for drilling equipmentExpiredDec 15, 94Jun 20, 95[F16D, B66D]
5038871 Apparatus for supporting a direct drive drilling unit in a position offset from the centerline of a wellExpiredJun 13, 90Aug 13, 91[E21B]
4981180 Positive lock of a drive assemblyExpiredJul 14, 89Jan 01, 91[E21B]
4951707 Seal for a pump valveExpiredApr 10, 89Aug 28, 90[F16K]
4928726 Crossarm valve seat with pulling ledgeExpiredJun 29, 88May 29, 90[F16K]
4922957 Valve with replaceable seal elementExpiredMar 08, 89May 08, 90[F16K]

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