Assignee
DUFRENE ALEX
4 granted patents·60 citations·filing 1974–1976
Top patents by PatentIndex Score
4 records- 0152US3960399ASetting and retrieval device for down-hole equipmentDUFRENE ALEX·Filed 1974·Granted Jun 1, 1976·18 cites·9 claims
- 0250US4046006ATubing plug apparatus for performing down-hole pressure testsDUFRENE ALEX·Filed 1975·Granted Sep 6, 1977·18 cites·9 claims
- 0348US4127297AReleasable overshotDUFRENE ALEX·Filed 1976·Granted Nov 28, 1978·17 cites·5 claims
- 0439US4044470ACollar locating apparatusDUFRENE ALEX·Filed 1976·Granted Aug 30, 1977·7 cites·7 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →