Assignee
DRUMCO
US·4 granted patents·92 citations·filing 1982–1987
Technology mixE21B4
Top patents by PatentIndex Score
4 records- 0178US4540055ADrill bit assembly having improved operational lifeDRUMCO·Filed 1983·Granted Sep 10, 1985·56 cites·9 claims
- 0249US4508183AMethod and apparatus for lubricating a drill bitDRUMCO·Filed 1983·Granted Apr 2, 1985·18 cites·18 claims
- 0334US4805709ADrill bit and drill assemblyDRUMCO·Filed 1987·Granted Feb 21, 1989·10 cites·10 claims
- 0434US4541494ADrill bit assemblyDRUMCO·Filed 1982·Granted Sep 17, 1985·8 cites·29 claims
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Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →