Assignee
WEATHERFORD HOLDING U S INC
US·6 granted patents·563 citations·filing 1997–1999
Top patents by PatentIndex Score
6 records- 0192US6263982B1Method and system for return of drilling fluid from a sealed marine riser to a floating drilling rig while drillingWEATHERFORD HOLDING U S INC·Filed 1999·Granted Jul 24, 2001·169 cites·30 claims
- 0291US6138774AMethod and apparatus for drilling a borehole into a subsea abnormal pore pressure environmentWEATHERFORD HOLDING U S INC·Filed 1998·Granted Oct 31, 2000·251 cites·18 claims
- 0388US6079489ACentrifugal backspin retarder and drivehead for use therewithWEATHERFORD HOLDING U S INC·Filed 1998·Granted Jun 27, 2000·54 cites·12 claims
- 0481US6113355APump drive head pump assembly with a hydraulic pump circuit for preventing back-spin when the drive head has been shut offWEATHERFORD HOLDING U S INC·Filed 1997·Granted Sep 5, 2000·41 cites·21 claims
- 0546US6125931ARight angle drive adapter for use with a vertical drive head in an oil well progressing cavity pump driveWEATHERFORD HOLDING U S INC·Filed 1998·Granted Oct 3, 2000·26 cites·8 claims
- 0641US6135740APump drive head backspin retarderWEATHERFORD HOLDING U S INC·Filed 1997·Granted Oct 24, 2000·22 cites·15 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →