Richard E. Dilgren — 7 Patents at Shell Oil Compny

Richard E. Dilgren has been granted 7 US patents while listed as an inventor at Shell Oil Compny. The first was granted in 1983 and the most recent in February 1987. Richard E. Dilgren ranks #680,018 of 4,157,543 US inventors in our database (top 16.4%). Patent records list Richard E. Dilgren in Houston, TX, US.

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Showing 1–7 of 7 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
4643256	Steam-foaming surfactant mixtures which are tolerant of divalent ions	Kenneth B. Owens	1987-02-17
4601336	Process for selecting a steam foam forming surfactant	Kenneth B. Owens	1986-07-22
4597442	Reservoir preflushing process for increasing the rate of surfactant transport in displacing oil with injected steam and steam-foaming surfactant	Hon Chung Lau, George J. Hirasaki	1986-07-01
4562727	Olefin sulfonate-improved steam foam drive	Kenneth B. Owens	1986-01-07
4532993	Selective steam foam soak oil recovery process	Paul B. Ritter, Jr.	1985-08-06
4488976	Olefin sulfonate-improved steam foam drive	Kenneth B. Owens	1984-12-18	$20,213,000
4393937	Olefin sulfonate-improved steam foam drive	Kenneth B. Owens	1983-07-19	$27,585,000

Richard E. Dilgren — 7 Patents

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