Individual holder
CRAWFORD DOUGLAS W
US·3 granted patents·101 citations·filing 1984–1990
Individually held — no corporate assignee on record.
Technology mixE21B3
Top patents by PatentIndex Score
3 records- 0168US4865125AHydraulic jar mechanismCRAWFORD DOUGLAS W·Filed 1988·Granted Sep 12, 1989·58 cites·22 claims
- 0254US4765403AApparatus for placing and removing well flow control devicesCRAWFORD DOUGLAS W·Filed 1984·Granted Aug 23, 1988·21 cites·42 claims
- 0347US5058670AOriented valve and latch for side pocket mandrelCRAWFORD DOUGLAS W·Filed 1990·Granted Oct 22, 1991·22 cites·16 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →