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Robert J. Kotch
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Humble, TX, US
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last 30 patents
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Patent Grant
Seal assembly for rotary drill bits
Patent number
4,838,365
Issue date
Jun 13, 1989
Reed Tool Company
Robert J. Kotch
E21 - EARTH DRILLING MINING
Information
Patent Grant
Roller cutter drill bit having a texturized seal member
Patent number
4,619,534
Issue date
Oct 28, 1986
Reed Tool Company
Jeffery E. Daly
E21 - EARTH DRILLING MINING
Information
Patent Grant
Compound dynamic seal for rolling cutter drill bit
Patent number
4,466,622
Issue date
Aug 21, 1984
Reed Rock Bit Company
John D. Deane
E21 - EARTH DRILLING MINING
Information
Patent Grant
Dynamic seal for rolling cutter drill bit
Patent number
4,306,727
Issue date
Dec 22, 1981
Reed Rock Bit Company
John D. Deane
E21 - EARTH DRILLING MINING