Inventor · disambiguated record
Richard E. Dilgren
Also filed as: DILGREN RICHARD E
9 granted patents·384 citations·filing 1977–1985
91Inventor score
Files withSHELL OIL CO9
Top patents by PatentIndex Score
9 records- 0188US4393937AOlefin sulfonate-improved steam foam driveSHELL OIL CO·Filed 1981·Granted Jul 19, 1983·89 cites·29 claims
- 0285US4643256ASteam-foaming surfactant mixtures which are tolerant of divalent ionsSHELL OIL CO·Filed 1985·Granted Feb 17, 1987·81 cites·5 claims
- 0383US4086964ASteam-channel-expanding steam foam driveSHELL OIL CO·Filed 1977·Granted May 2, 1978·63 cites·10 claims
- 0482US4488976AOlefin sulfonate-improved steam foam driveSHELL OIL CO·Filed 1983·Granted Dec 18, 1984·63 cites·5 claims
- 0569US4532993ASelective steam foam soak oil recovery processSHELL OIL CO·Filed 1983·Granted Aug 6, 1985·36 cites·4 claims
- 0657US4161217AHot water foam oil production processSHELL OIL CO·Filed 1978·Granted Jul 17, 1979·21 cites·16 claims
- 0742US4597442AReservoir preflushing process for increasing the rate of surfactant transport in displacing oil with injected steam and steam-foaming surfactantSHELL OIL CO·Filed 1985·Granted Jul 1, 1986·14 cites·10 claims
- 0839US4562727AOlefin sulfonate-improved steam foam driveSHELL OIL CO·Filed 1984·Granted Jan 7, 1986·7 cites·2 claims
- 0938US4601336AProcess for selecting a steam foam forming surfactantSHELL OIL CO·Filed 1984·Granted Jul 22, 1986·10 cites·6 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →