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John H. Craig
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Houston, TX, US
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last 30 patents
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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
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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