Inventor · disambiguated record
John A. Drumheller
Also filed as: DRUMHELLER JOHN A
3 granted patents·1,023 citations·filing 1988–1990
82Inventor score
Technology areasE02D
Top patents by PatentIndex Score
3 records- 0195US5050386AMethod and apparatus for containment of hazardous material migration in the earthRKK LTD·Filed 1990·Granted Sep 24, 1991·334 cites·24 claims
- 0294US4974425AClosed cryogenic barrier for containment of hazardous material migration in the earthCONCEPT RKK LIMITED·Filed 1989·Granted Dec 4, 1990·342 cites·24 claims
- 0394US4860544AClosed cryogenic barrier for containment of hazardous material migration in the earthCONCEPT RKK LTD·Filed 1988·Granted Aug 29, 1989·347 cites·84 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →