Assignee
TSUKAMOTO SEIKI KK
JP·5 granted patents·245 citations·filing 1977–1988
Top patents by PatentIndex Score
5 records- 0185US4392534AComposite nozzle for earth boring and bore enlarging bitsTSUKAMOTO SEIKI KK·Filed 1981·Granted Jul 12, 1983·101 cites·1 claims
- 0278US4407375APressure compensator for rotary earth boring toolTSUKAMOTO SEIKI KK·Filed 1981·Granted Oct 4, 1983·48 cites·3 claims
- 0378US4113290APressure tight joint for a large diameter casingTSUKAMOTO SEIKI KK·Filed 1977·Granted Sep 12, 1978·50 cites·3 claims
- 0471US4747604ARotary shaft seal for drill bit cuttersTSUKAMOTO SEIKI KK·Filed 1986·Granted May 31, 1988·40 cites·5 claims
- 0533US4900164AAxial retainer for a cutter in a rotary drill bitTSUKAMOTO SEIKI KK·Filed 1988·Granted Feb 13, 1990·6 cites·2 claims
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