Inventor · disambiguated record
Donald U. Shaffer
Also filed as: SHAFFER DONALD U
3 granted patents·215 citations·filing 1982–1986
77Inventor score
Files withSHAFFER DONALD U3
Top patents by PatentIndex Score
3 records- 0186US4448255ARotary blowout preventerSHAFFER DONALD U·Filed 1982·Granted May 15, 1984·120 cites·14 claims
- 0278US4550895ARam construction for oil well blow out preventer apparatusSHAFFER DONALD U·Filed 1984·Granted Nov 5, 1985·60 cites·16 claims
- 0370US4688828ATubing joint for corrosion protectionSHAFFER DONALD U·Filed 1986·Granted Aug 25, 1987·35 cites·1 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →