George W. Lee

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St. Paul, MN, US

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Patents Grantslast 30 patents

Information Patent Grant
Particulate ceramic useful as a proppant
- Patent number 4,944,905
- Issue date Jul 31, 1990
- Minnesota Mining and Manufacturing Company
- James L. Gibb
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Particulate ceramic useful as a proppant
- Patent number 4,680,230
- Issue date Jul 14, 1987
- Minnesota Mining and Manufacturing Company
- James L. Gibb
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES