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Richfield Oil Corp

Richfield

Active Patents

0

Total Holdings

4

Patent Holdings

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Patent No.	Title	Status	Filing Date	Grant Date	Claims	Actions
US3236301A	Drilling and production apparatus and method	Expired / Lapsed	1961-07-10	1966-02-22	2	Details
US3219117A	Well drilling and production apparatus and method	Expired / Lapsed	1961-07-10	1965-11-23	1	Details
US3004602A	Underwater oil well completion	Expired / Lapsed	1956-11-05	1961-10-17	2	Details
US2917281A	Releasing head for submarine conductor casing	Expired / Lapsed	1957-07-26	1959-12-15	0	Details