REED TOOL COMPANY

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5029656 Nozzle means for rotary drill bitsExpiredMar 30, 90Jul 09, 91[E21B]
5025874 Cutting elements for rotary drill bitsExpiredApr 04, 89Jun 25, 91[E21B]
5012701 Method of making a threaded retainer ring for a roller cutter on a drill bitExpiredFeb 05, 90May 07, 91[B21K]
4991671 Means for mounting a roller cutter on a drill bitExpiredMar 13, 90Feb 12, 91[E21B]
4989680 Drill bit having improved hydraulic action for directing drilling fluidExpiredJul 17, 89Feb 05, 91[E21B]
4982496 Method of making lug journal for roller cutter drill bitsExpiredNov 16, 89Jan 08, 91[B23B, B21D]
4969378 Case hardened roller cutter for a rotary drill bit and method of makingExpiredOct 13, 89Nov 13, 90[B21K]
4794994 Drag drill bit having improved flow of drilling fluidExpiredMar 26, 87Jan 03, 89[E21B]
4776412 Nozzle assembly for rotary drill bit and method of installationExpiredJan 29, 88Oct 11, 88[E21B]
4646857 Means to secure cutting elements on drag type drill bitsExpiredOct 24, 85Mar 03, 87[E21B]
4446935 Intermittent high-drag oil well drilling bitExpiredSep 20, 82May 08, 84[E21B]
4293167 Rolling cutter drill bit with improved journal configurationExpiredMar 24, 80Oct 06, 81[F16C]
4277108 Hard surfacing for oil well toolsExpiredMay 01, 80Jul 07, 81[F16C]
4256191 Intermittent high-drag oil well drilling methods and apparatusExpiredMar 28, 79Mar 17, 81[E21B]
4254840 Drill bit insertExpiredOct 05, 78Mar 10, 81[E21C]
4241798 Drilling bits for plastic formationsExpiredJan 29, 79Dec 30, 80[E21B]

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