Assignee
WASHINGTON ROTATING CONTROL HE
US·3 granted patents·194 citations·filing 1981–1984
Technology mixE21B3
Top patents by PatentIndex Score
3 records- 0188US4486025AStripper packerWASHINGTON ROTATING CONTROL HE·Filed 1984·Granted Dec 4, 1984·99 cites·8 claims
- 0278US4531591ADrilling head method and apparatusWASHINGTON ROTATING CONTROL HE·Filed 1983·Granted Jul 30, 1985·57 cites·17 claims
- 0363US4345769ADrilling head assembly sealWASHINGTON ROTATING CONTROL HE·Filed 1981·Granted Aug 24, 1982·38 cites·4 claims
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