Inventor · disambiguated record
Robijn Feenstra
Also filed as: FEENSTRA ROBIJN
4 granted patents·228 citations·filing 1977–1983
82Inventor score
Technology areasE21B
Files withSHELL OIL CO4
Top patents by PatentIndex Score
4 records- 0189US4465147AMethod and means for controlling the course of a bore holeSHELL OIL CO·Filed 1983·Granted Aug 14, 1984·96 cites·3 claims
- 0280US4485879ADownhole motor and method for directional drilling of boreholesSHELL OIL CO·Filed 1983·Granted Dec 4, 1984·59 cites·2 claims
- 0376US4116289ARotary bit with ridgesSHELL OIL CO·Filed 1977·Granted Sep 26, 1978·44 cites·6 claims
- 0461US4341273ARotary bit with jet nozzlesSHELL OIL CO·Filed 1981·Granted Jul 27, 1982·29 cites·13 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →