Assignee
PIPER OILFIELD PRODUCTS INC
US·3 granted patents·185 citations·filing 1991–1995
Top patents by PatentIndex Score
3 records- 0188US5205325AFlow control valvePIPER OILFIELD PRODUCTS INC·Filed 1991·Granted Apr 27, 1993·77 cites·19 claims
- 0267US5273108AClosure apparatus for blow out preventionPIPER OILFIELD PRODUCTS INC·Filed 1992·Granted Dec 28, 1993·52 cites·18 claims
- 0357US5522464AHydraulic tubing head assemblyPIPER OILFIELD PRODUCTS INC·Filed 1995·Granted Jun 4, 1996·56 cites·20 claims
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