Roger P. Johns

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Terrace Mustang, OK, US

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Patents Grantslast 30 patents

Information Patent Grant
Air percussion drilling assembly for directional drilling applications
- Patent number RE36166
- Issue date Mar 30, 1999
- Smith International, Inc.
- Roger P. Johns
- 175 - Boring or penetrating the earth
Information Patent Grant
Core cutting rock bit
- Patent number 5,394,952
- Issue date Mar 7, 1995
- Smith International, Inc.
- Roger P. Johns
- E21 - EARTH DRILLING MINING
Information Patent Grant
Air percussion drilling assembly for directional drilling applications
- Patent number 5,305,837
- Issue date Apr 26, 1994
- Smith International, Inc.
- Roger P. Johns
- E21 - EARTH DRILLING MINING