Assignee

APPLETON ROBERT P

GB·2 granted patents·80 citations·filing 1985–1992

Technology mixE21B2 Y10T1

Top patents by PatentIndex Score

2 records

0187US5479988AMud check valves in drilling apparatus (wells)APPLETON ROBERT P·Filed 1992·Granted Jan 2, 1996·64 cites·9 claims
0242US4545432ADevice for retrieving objects from wellsAPPLETON ROBERT P·Filed 1985·Granted Oct 8, 1985·16 cites·5 claims

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