Inventor · disambiguated record
Norman E. Johnstone
Also filed as: JOHNSTONE NORMAN E
6 granted patents·276 citations·filing 1981–1988
87Inventor score
Files withUNITED STATES GYPSUM CO6
Top patents by PatentIndex Score
6 records- 0191US4853085ANeutral sized paper for use in the production of gypsum wallboardUNITED STATES GYPSUM CO·Filed 1982·Granted Aug 1, 1989·65 cites·28 claims
- 0290US4372814APaper having mineral filler for use in the production of gypsum wallboardUNITED STATES GYPSUM CO·Filed 1981·Granted Feb 8, 1983·70 cites·22 claims
- 0389US4470877APaper having calcium sulfate mineral filler for use in the production of gypsum wallboardUNITED STATES GYPSUM CO·Filed 1983·Granted Sep 11, 1984·65 cites·28 claims
- 0487US4548676APaper having calcium sulfate mineral filler for use in the production of gypsum wallboardUNITED STATES GYPSUM CO·Filed 1984·Granted Oct 22, 1985·59 cites·13 claims
- 0555US4801355ATabular acicular gypsum and method of filling paperUNITED STATES GYPSUM CO·Filed 1987·Granted Jan 31, 1989·9 cites·11 claims
- 0645US5106600AProcess for producing tabular acicular gypsum crystalsUNITED STATES GYPSUM CO·Filed 1988·Granted Apr 21, 1992·8 cites·8 claims
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