Assignee
LONGYEAR CO
US·17 granted patents·726 citations·filing 1974–1994
Top patents by PatentIndex Score
17 records- 0190US4823890AReverse circulation bit apparatusLONGYEAR CO·Filed 1988·Granted Apr 25, 1989·175 cites·10 claims
- 0287US4800969AFast descent core barrel apparatusLONGYEAR CO·Filed 1987·Granted Jan 31, 1989·97 cites·15 claims
- 0385US4834198APositive latch wire line core barrel apparatusLONGYEAR CO·Filed 1988·Granted May 30, 1989·82 cites·34 claims
- 0484US5267620ADrilling latch apparatusLONGYEAR CO·Filed 1992·Granted Dec 7, 1993·90 cites·44 claims
- 0575US3930679ADry hole wire core barrel apparatusLONGYEAR CO·Filed 1974·Granted Jan 6, 1976·40 cites·28 claims
- 0672US5325930AOvercenter toggle latch apparatusLONGYEAR CO·Filed 1993·Granted Jul 5, 1994·61 cites·19 claims
- 0767US4281725AKnuckle joint spearhead core drilling apparatusLONGYEAR CO·Filed 1979·Granted Aug 4, 1981·41 cites·14 claims
- 0866US4266444AHigh-low speed rotary drive mechanismLONGYEAR CO·Filed 1979·Granted May 12, 1981·20 cites·19 claims
- 0957US4309922ARod break-out and make-up toolLONGYEAR CO·Filed 1979·Granted Jan 12, 1982·22 cites·20 claims
- 1049US4375212AConcrete sawing machine propulsion control apparatusLONGYEAR CO·Filed 1981·Granted Mar 1, 1983·17 cites·15 claims
- 1148US3952817ABasket type core retainerLONGYEAR CO·Filed 1974·Granted Apr 27, 1976·13 cites·16 claims
- 1239US5183366ARod handler apparatusLONGYEAR CO·Filed 1990·Granted Feb 2, 1993·17 cites·15 claims
- 1338US5404959ADrill rig safety shutdown deviceLONGYEAR CO·Filed 1994·Granted Apr 11, 1995·17 cites·3 claims
- 1438US5105687ABuilt-in rack apparatusLONGYEAR CO·Filed 1990·Granted Apr 21, 1992·8 cites·18 claims
- 1530US5040438APowered wrench apparatusLONGYEAR CO·Filed 1990·Granted Aug 20, 1991·17 cites·21 claims
- 1630US5031708ACockable corebreaker apparatusLONGYEAR CO·Filed 1990·Granted Jul 16, 1991·6 cites·22 claims
- 1724US4297771APivoting foot clamp and mounting frameLONGYEAR CO·Filed 1979·Granted Nov 3, 1981·3 cites·12 claims
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