John H. Craig

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Houston, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Automatic cementing system with improved density control
- Patent number 5,775,803
- Issue date Jul 7, 1998
- Stewart & Stevenson Services, Inc.
- Clifford Stanley Montgomery
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Automatic cementing system with improved density control
- Patent number 5,624,182
- Issue date Apr 29, 1997
- Stewart & Stevenson Services, Inc.
- Michael P. Dearing
- B28 - WORKING CEMENT, CLAY, OR STONE