Inventor · disambiguated record

Fred G. Helfferich

Also filed as: HELFFERICH FRED G

1 granted patent·35 citations·filing 1977–1977

45Inventor score

Technology areasC09K

Files withSHELL OIL CO1

Top patents by PatentIndex Score

1 record

0176US4074755AIon exchange controlled chemically aided waterflood processSHELL OIL CO·Filed 1977·Granted Feb 21, 1978·35 cites·3 claims

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