Inventor · disambiguated record
Donald J. Barrus
Also filed as: BARRUS DONALD J
4 granted patents·95 citations·filing 1989–1997
79Inventor score
Technology areasE21B
Top patents by PatentIndex Score
4 records- 0166US5501580AProgressive cavity pump with flexible couplingBAKER HUGHES INC·Filed 1995·Granted Mar 26, 1996·47 cites·6 claims
- 0246US4969513AHigh pressure automatic kelly valveKOB INC·Filed 1989·Granted Nov 13, 1990·23 cites·20 claims
- 0341USRE37995EProgressive cavity pump with flexible couplingBAKER HUGHES INC·Filed 1997·Granted Feb 18, 2003·16 cites·12 claims
- 0427US5253704AHigh pressure automatic mud saver valveKOB INC·Filed 1990·Granted Oct 19, 1993·9 cites·7 claims
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