Robert M. Johnson

Person

Kenmore, NY, US

People

Patents Grantslast 30 patents

Information Patent Grant
Reinforced cement sheet product containing no asbestos for fabricat...
- Patent number 4,543,159
- Issue date Sep 24, 1985
- National Gypsum Company
- Robert M. Johnson
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Foamed gypsum wallboard
- Patent number 4,455,271
- Issue date Jun 19, 1984
- National Gypsum Company
- Robert M. Johnson
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Reinforced cement sheet product containing no asbestos for fabricat...
- Patent number 4,428,775
- Issue date Jan 31, 1984
- National Gypsum Company
- Robert M. Johnson
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Reinforced cement sheet product containing wollastonite for reduced...
- Patent number 4,377,415
- Issue date Mar 22, 1983
- National Gypsum Company
- Robert M. Johnson
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Reinforced cement sheet product containing fibers other than asbest...
- Patent number 4,363,666
- Issue date Dec 14, 1982
- National Gypsum Company
- Robert M. Johnson
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Block-resistant gypsum board
- Patent number 4,057,662
- Issue date Nov 8, 1977
- National Gypsum Company
- Robert M. Johnson
- B44 - DECORATIVE ARTS
Information Patent Grant
Foamed gypsum wallboard
- Patent number 4,057,443
- Issue date Nov 8, 1977
- National Gypsum Company
- Rodney A. Stiling
- B28 - WORKING CEMENT, CLAY, OR STONE
Information Patent Grant
Water-resistant asbestos-cement
- Patent number 3,985,610
- Issue date Oct 12, 1976
- National Gypsum Company
- Robert C. Pomerhn
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES

Robert M. Johnson

Person

Patents Grantslast 30 patents

Reinforced cement sheet product containing no asbestos for fabricat...

Foamed gypsum wallboard

Reinforced cement sheet product containing no asbestos for fabricat...

Reinforced cement sheet product containing wollastonite for reduced...

Reinforced cement sheet product containing fibers other than asbest...

Block-resistant gypsum board

Foamed gypsum wallboard

Water-resistant asbestos-cement