Norman E. Johnstone

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Schaumburg, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Process for producing tabular acicular gypsum crystals
- Patent number 5,106,600
- Issue date Apr 21, 1992
- United States Gypsum Company
- Norman E. Johnstone
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
Information Patent Grant
Neutral sized paper for use in the production of gypsum wallboard
- Patent number 4,853,085
- Issue date Aug 1, 1989
- United States Gypsum Company
- Norman E. Johnstone
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
Information Patent Grant
Tabular acicular gypsum and method of filling paper
- Patent number 4,801,355
- Issue date Jan 31, 1989
- United States Gypsum Company
- Norman E. Johnstone
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
Information Patent Grant
Paper having calcium sulfate mineral filler for use in the producti...
- Patent number 4,548,676
- Issue date Oct 22, 1985
- United States Gypsum Company
- Norman E. Johnstone
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
Information Patent Grant
Paper having calcium sulfate mineral filler for use in the producti...
- Patent number 4,470,877
- Issue date Sep 11, 1984
- United States Gypsum Company
- Norman E. Johnstone
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
Information Patent Grant
Paper having mineral filler for use in the production of gypsum wal...
- Patent number 4,372,814
- Issue date Feb 8, 1983
- United States Gypsum Company
- Norman E. Johnstone
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE