Assignee
WILLIS OIL TOOL CO
6 granted patents·266 citations·filing 1974–1977
Top patents by PatentIndex Score
6 records- 0195US3958592ASafety shut-off valveWILLIS OIL TOOL CO·Filed 1974·Granted May 25, 1976·157 cites·5 claims
- 0283US4016621ADevice and method for launching and/or retrieving pipeline scrapersWILLIS OIL TOOL CO·Filed 1975·Granted Apr 12, 1977·41 cites·10 claims
- 0375US4026326AActuator pilot for fluid pressure monitoring safety systemWILLIS OIL TOOL CO·Filed 1975·Granted May 31, 1977·28 cites·2 claims
- 0466US3977438AMeans to reset an actuator pilot valveWILLIS OIL TOOL CO·Filed 1975·Granted Aug 31, 1976·18 cites·20 claims
- 0564US4017053AFluid pressure monitoring safety systemWILLIS OIL TOOL CO·Filed 1974·Granted Apr 12, 1977·19 cites·7 claims
- 0631US4116215AAutomatic reset pilot valveWILLIS OIL TOOL CO·Filed 1977·Granted Sep 26, 1978·3 cites·6 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →