Inventor · disambiguated record
Donald L. Heffner
Also filed as: HEFFNER DONALD L
7 granted patents·45 citations·filing 1985–1988
82Inventor score
Files withGEN MOTORS CORP7
Top patents by PatentIndex Score
7 records- 0165US4628959AVacuum check valveGEN MOTORS CORP·Filed 1985·Granted Dec 16, 1986·24 cites·5 claims
- 0237US4750516AVacuum check valveGEN MOTORS CORP·Filed 1987·Granted Jun 14, 1988·6 cites·3 claims
- 0333US4763689AVacuum check valveGEN MOTORS CORP·Filed 1987·Granted Aug 16, 1988·5 cites·2 claims
- 0432US4724867AVacuum check valveGEN MOTORS CORP·Filed 1986·Granted Feb 16, 1988·6 cites·1 claims
- 0529US4750517AVacuum check valveGEN MOTORS CORP·Filed 1987·Granted Jun 14, 1988·1 cites·3 claims
- 0625US4756333AVacuum check valveGEN MOTORS CORP·Filed 1987·Granted Jul 12, 1988·2 cites·2 claims
- 0723US4856554AVacuum check valve and method of controlGEN MOTORS CORP·Filed 1988·Granted Aug 15, 1989·1 cites·3 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →