Assignee
VARCO SHAFFER INC
US·16 granted patents·1,629 citations·filing 1993–2003
Top patents by PatentIndex Score
16 records- 0193US6374925B1Well drilling method and systemVARCO SHAFFER INC·Filed 2000·Granted Apr 23, 2002·167 cites·26 claims
- 0291US5588491ARotating blowout preventer and methodVARCO SHAFFER INC·Filed 1995·Granted Dec 31, 1996·135 cites·20 claims
- 0390US5662171ARotating blowout preventer and methodVARCO SHAFFER INC·Filed 1996·Granted Sep 2, 1997·129 cites·20 claims
- 0488US6527062B2Well drilling method and systemVARCO SHAFFER INC·Filed 2002·Granted Mar 4, 2003·91 cites·26 claims
- 0588US6244560B1Blowout preventer ram actuating mechanismVARCO SHAFFER INC·Filed 2000·Granted Jun 12, 2001·94 cites·23 claims
- 0687US6192680B1Subsea hydraulic control systemVARCO SHAFFER INC·Filed 1999·Granted Feb 27, 2001·132 cites·24 claims
- 0786US5897094ABOP with improved door connectorsVARCO SHAFFER INC·Filed 1996·Granted Apr 27, 1999·115 cites·32 claims
- 0886US5400857AOilfield tubular shear ram and method for blowout preventionVARCO SHAFFER INC·Filed 1993·Granted Mar 28, 1995·113 cites·20 claims
- 0985US5735502ABOP with partially equalized ram shaftsVARCO SHAFFER INC·Filed 1996·Granted Apr 7, 1998·146 cites·20 claims
- 1081US5975484ADoor connectorsVARCO SHAFFER INC·Filed 1998·Granted Nov 2, 1999·85 cites·20 claims
- 1180US5505426AHydraulically controlled blowout preventerVARCO SHAFFER INC·Filed 1995·Granted Apr 9, 1996·98 cites·20 claims
- 1279US5778918APilot valve with improved cageVARCO SHAFFER INC·Filed 1996·Granted Jul 14, 1998·107 cites·20 claims
- 1379US5575452ABlowout preventer with ram wedge locksVARCO SHAFFER INC·Filed 1995·Granted Nov 19, 1996·109 cites·20 claims
- 1475US6857634B2BOP assembly with metal insertsVARCO SHAFFER INC·Filed 2003·Granted Feb 22, 2005·49 cites·20 claims
- 1575US6719042B2Shear ram assemblyVARCO SHAFFER INC·Filed 2002·Granted Apr 13, 2004·56 cites·20 claims
- 1640US7380589B2Subsea coiled tubing injector with pressure compensationVARCO SHAFFER INC·Filed 2003·Granted Jun 3, 2008·3 cites·20 claims
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