LONGYEAR COMPANY

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5404959 Drill rig safety shutdown deviceExpiredMay 03, 94Apr 11, 95[E21B]
5183366 Rod handler apparatusExpiredDec 04, 90Feb 02, 93[E21B]
5105687 Built-in rack apparatusExpiredJun 26, 90Apr 21, 92[F16H, E21B]
5040438 Powered wrench apparatusExpiredMar 30, 90Aug 20, 91[B25B]
5031708 Cockable corebreaker apparatusExpiredApr 20, 90Jul 16, 91[E21B]
4834198 Positive latch wire line core barrel apparatusExpiredApr 25, 88May 30, 89[E21B]
4823890 Reverse circulation bit apparatusExpiredFeb 23, 88Apr 25, 89[F21B]
4800969 Fast descent core barrel apparatusExpiredNov 24, 87Jan 31, 89[E21B]
4375212 Concrete sawing machine propulsion control apparatusExpiredJan 19, 81Mar 01, 83[B28D]
4309922 Rod break-out and make-up toolExpiredJun 14, 79Jan 12, 82[B25B]
4297771 Pivoting foot clamp and mounting frameExpiredJun 14, 79Nov 03, 81[E21B, A44B]
4281722 Retractable bit systemExpiredMay 15, 79Aug 04, 81[E21B]
4281725 Knuckle joint spearhead core drilling apparatusExpiredSep 20, 79Aug 04, 81[E21B]
4266444 High-low speed rotary drive mechanismExpiredJun 14, 79May 12, 81[F16H, E21B]

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