Inventor · disambiguated record
Douglas C. Campbell
Also filed as: CAMPBELL DOUGLAS C · CAMPBELL DOUGLAS C V · CAMPBELL DOUGLAS CLINTON
13 granted patents·415 citations·filing 1976–1998
94Inventor score
Top patents by PatentIndex Score
13 records- 0191US5208936AVariable speed pig for pipelinesCAMPBELL DOUGLAS C·Filed 1991·Granted May 11, 1993·73 cites·11 claims
- 0288US6190090B1Apparatus for use in a pipelineTUBOSCOPE PIPELINE SERVICES CA·Filed 1996·Granted Feb 20, 2001·69 cites·13 claims
- 0381US4991651APipeline packer for plugging a pipeline at a desired locationDOWASUE IND LTD·Filed 1989·Granted Feb 12, 1991·49 cites·27 claims
- 0480US4854384APipeline packerDAWASUE IND LIMITED·Filed 1987·Granted Aug 8, 1989·48 cites·23 claims
- 0574US5517847AOpen compartment load leveling ride height controlFORD MOTOR CO·Filed 1994·Granted May 21, 1996·41 cites·16 claims
- 0665US5570287ASpeed dependent suspension controlFORD MOTOR CO·Filed 1994·Granted Oct 29, 1996·31 cites·18 claims
- 0761US5593176ARide height setting based on transfer case settingFORD MOTOR CO·Filed 1994·Granted Jan 14, 1997·27 cites·12 claims
- 0850US5555173ADamping factor switching in vehicle shock absorbersFORD MOTOR CO·Filed 1994·Granted Sep 10, 1996·20 cites·7 claims
- 0944US4043394APlugging of abandoned dry wellsCAMPBELL DOUGLAS C·Filed 1976·Granted Aug 23, 1977·12 cites·4 claims
- 1036US6120479AAuto-destruct disposable syringeFiled 1998·Granted Sep 19, 2000·33 cites·10 claims
- 1129US5186487ASelectable damping vehicle suspension control responsive to engine torqueGEN MOTORS CORP·Filed 1991·Granted Feb 16, 1993·4 cites·2 claims
- 1229US5163702ASelectable damping vehicle suspension controlGEN MOTORS CORP·Filed 1991·Granted Nov 17, 1992·5 cites·4 claims
- 1328US5163705ASelectable damping vehicle suspension control responsive to transmission shiftGEN MOTORS CORP·Filed 1991·Granted Nov 17, 1992·3 cites·1 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →