John D. Parrish

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Rock bit manufacturing method
- Patent number 4,794,822
- Issue date Jan 3, 1989
- Baker Hughes Incorporated
- John D. Parrish
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Large diameter oil well drilling bit
- Patent number 4,369,849
- Issue date Jan 25, 1983
- Reed Rock Bit Company
- John D. Parrish
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rolling cutter drill bit with improved journal configuration
- Patent number 4,293,167
- Issue date Oct 6, 1981
- Reed Tool Company
- Terry H. Mayo
- E21 - EARTH DRILLING MINING