Inventor · disambiguated record
Eugene Darrell Simmons
Also filed as: SIMMONS EUGENE D · SIMMONS EUGENE DARRELL
3 granted patents·108 citations·filing 1984–2009
74Inventor score
Technology areasF04B
Top patents by PatentIndex Score
3 records- 0182US4861239AHigh efficiency pump method and apparatus with hydraulic actuationRENT LTD·Filed 1988·Granted Aug 29, 1989·64 cites·25 claims
- 0274US4616981APumping apparatus with a down-hale spring loaded piston actuated by fluid pressureSIMMONS EUGENE D·Filed 1984·Granted Oct 14, 1986·37 cites·11 claims
- 0373US8573309B2Liquid rod pump and methodSIMMONS EUGENE DARRELL·Filed 2009·Granted Nov 5, 2013·7 cites·7 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →