Inventor · disambiguated record
Douglas G. Calvin
Also filed as: CALVIN DOUGLAS G · HOWARD CURTIS E
15 granted patents·246 citations·filing 1974–1998
94Inventor score
Top patents by PatentIndex Score
15 records- 0184US5244183AFugitive emission sealing assemblyKEYSTONE INT·Filed 1991·Granted Sep 14, 1993·55 cites·39 claims
- 0266US4773625ACorrosion-resistant overlay for the edge of butterfly valvesKEYSTONE INT·Filed 1987·Granted Sep 27, 1988·22 cites·21 claims
- 0365US4137968AIgnition system for an automatic burner for in situ combustion for enhanced thermal recovery of hydrocarbons from a wellTEXACO INC·Filed 1977·Granted Feb 6, 1979·20 cites·9 claims
- 0462US4079784AMethod for in situ combustion for enhanced thermal recovery of hydrocarbons from a well and ignition system thereforTEXACO INC·Filed 1976·Granted Mar 21, 1978·18 cites·15 claims
- 0561US4269211ASteam manifold distribution system for providing equal quality of steam in two linesTEXACO INC·Filed 1979·Granted May 26, 1981·16 cites·15 claims
- 0659US4136737AMethod for automatically initiating in situ combustion for enhanced thermal recovery of hydrocarbons from a wellTEXACO INC·Filed 1977·Granted Jan 30, 1979·16 cites·7 claims
- 0753US5934645ARotary valve with pressure energized sealTYCO FLOW CONTROL INC·Filed 1998·Granted Aug 10, 1999·14 cites·4 claims
- 0853US4846441AMethods and apparatus for adjusting a valve closure memberKEYSTONE INT·Filed 1988·Granted Jul 11, 1989·16 cites·16 claims
- 0951US5765815ARotary valve with pressurized energized sealKEYSTONE INT·Filed 1997·Granted Jun 16, 1998·13 cites·13 claims
- 1051US4899775ACorrosion-resistant overlay for the edge of butterfly valvesKEYSTONE INT·Filed 1988·Granted Feb 13, 1990·14 cites·6 claims
- 1149US3981189AMethods and steam samplers with inertial latchTEXACO INC·Filed 1975·Granted Sep 21, 1976·15 cites·10 claims
- 1243US4205725AMethod for forming an automatic burner for in situ combustion for enhanced thermal recovery of hydrocarbons from a wellTEXACO INC·Filed 1978·Granted Jun 3, 1980·11 cites·8 claims
- 1340US3934469AMethod and steam samplersTEXACO INC·Filed 1974·Granted Jan 27, 1976·9 cites·19 claims
- 1431US4317384AManual override drive apparatusTAPCO INTERNATIONAL·Filed 1980·Granted Mar 2, 1982·4 cites·13 claims
- 1531US4088187AWell steam sampler apparatus and method of forming and using a well steam samplerTEXACO INC·Filed 1977·Granted May 9, 1978·3 cites·16 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →