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Fred Keller Jr.
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Bethlehem, PA, US
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Patents Grants
last 30 patents
Information
Patent Grant
Concrete building block assembly
Patent number
5,881,511
Issue date
Mar 16, 1999
Fred Keller
E04 - BUILDING
Information
Patent Grant
Ceramic aggregate for roadway composition and method of producing same
Patent number
4,873,207
Issue date
Oct 10, 1989
Fred Keller
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Insulating ceramic building material and method with fired clay and...
Patent number
4,780,433
Issue date
Oct 25, 1988
Fred Keller
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information
Patent Grant
Ceramic composition to make cement with insulating properties
Patent number
4,740,486
Issue date
Apr 26, 1988
Fred Keller
C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES