Inventor · disambiguated record
William T. Ilfrey
Also filed as: ILFREY WILLIAM T
6 granted patents·438 citations·filing 1975–1988
88Inventor score
Technology areasE21B
Top patents by PatentIndex Score
6 records- 0193US4131287AAnnular sealEXXON PRODUCTION RESEARCH CO·Filed 1977·Granted Dec 26, 1978·113 cites·10 claims
- 0290US4147221ARiser set-aside systemEXXON PRODUCTION RESEARCH CO·Filed 1977·Granted Apr 3, 1979·89 cites·40 claims
- 0389US4858691AGravel packing apparatus and methodBAKER HUGHES INC·Filed 1988·Granted Aug 22, 1989·97 cites·31 claims
- 0484US3999617ASelf-supported drilling riserEXXON PRODUCTION RESEARCH CO·Filed 1975·Granted Dec 28, 1976·66 cites·14 claims
- 0573US3981357AMarine riserEXXON PRODUCTION RESEARCH CO·Filed 1975·Granted Sep 21, 1976·39 cites·3 claims
- 0668US4090395ACasing seal and blowout preventer tester and test methodEXXON PRODUCTION RESEARCH CO·Filed 1977·Granted May 23, 1978·34 cites·16 claims
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