Tsukamoto Seiki Co., Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4900164 Axial retainer for a cutter in a rotary drill bitExpiredFeb 25, 88Feb 13, 90[F16C, E21B]
4747604 Rotary shaft seal for drill bit cuttersExpiredSep 18, 86May 31, 88[F16J]
4407375 Pressure compensator for rotary earth boring toolExpiredAug 17, 81Oct 04, 83[E21B]
4392534 Composite nozzle for earth boring and bore enlarging bitsExpiredAug 12, 81Jul 12, 83[E21B]

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