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Grefco, Inc.
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Los Angeles, CA, US
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Patents Grants
last 30 patents
Information
Patent Grant
Expanded mineral particles and apparatus and method of production
Patent number
5,002,696
Issue date
Mar 26, 1991
Grefco, Inc.
William R. White
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Method for the treatment of mineral extender fillers
Patent number
4,671,973
Issue date
Jun 9, 1987
Grefco, Inc.
Harlan E. Tarbell
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Diatomaceous earth filteraid and method for its manufacture
Patent number
4,142,968
Issue date
Mar 6, 1979
Grefco, Inc.
Richard B. Nielsen
B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
Information
Patent Grant
Mineral aggregate (perlite) acoustical board
Patent number
3,952,830
Issue date
Apr 27, 1976
Grefco, Inc.
Otto A. Oshida
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES