Assignee
WEBB DERREL D
4 granted patents·173 citations·filing 1977–1985
Technology mixE21B4
Top patents by PatentIndex Score
4 records- 0186US4606417APressure equalized stabilizer apparatus for drill stringWEBB DERREL D·Filed 1985·Granted Aug 19, 1986·84 cites·3 claims
- 0281US4109736ADouble acting jarWEBB DERREL D·Filed 1977·Granted Aug 29, 1978·50 cites·33 claims
- 0358US4226289AIndependent one-way acting hydraulic jar sections for a rotary drill stringWEBB DERREL D·Filed 1979·Granted Oct 7, 1980·20 cites·18 claims
- 0451US4545444AJar mechanism energizerWEBB DERREL D·Filed 1984·Granted Oct 8, 1985·19 cites·36 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →