Individual holder
BIRDWELL J C
US·6 granted patents·230 citations·filing 1977–1988
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
6 records- 0193US4500267AMud pumpBIRDWELL J C·Filed 1983·Granted Feb 19, 1985·66 cites·12 claims
- 0278US4541779AMud pumpBIRDWELL J C·Filed 1983·Granted Sep 17, 1985·30 cites·50 claims
- 0372US4869100AVariable orifice control meansBIRDWELL J C·Filed 1988·Granted Sep 26, 1989·44 cites·11 claims
- 0470US4932005AFluid means for data transmissionBIRDWELL J C·Filed 1988·Granted Jun 5, 1990·41 cites·12 claims
- 0568US4676724AMud pumpBIRDWELL J C·Filed 1985·Granted Jun 30, 1987·41 cites·10 claims
- 0646US4098359AHydraulically operated downhole motorBIRDWELL J C·Filed 1977·Granted Jul 4, 1978·8 cites·10 claims
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