Norman E. Johnstone
6Patents
5h-index
3Co-inventors
48Inventor score
Filing activity: May 13, 1981 → Sep 14, 1988
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4470877A | Paper having calcium sulfate mineral filler for use in the production of gypsum wallboard | Emerging Cross-Sectional Technologies | 50 | Expired |
| US4372814A | Paper having mineral filler for use in the production of gypsum wallboard | Emerging Cross-Sectional Technologies | 43 | Expired |
| US4853085A | Neutral sized paper for use in the production of gypsum wallboard | Emerging Cross-Sectional Technologies | 43 | Expired |
| US4548676A | Paper having calcium sulfate mineral filler for use in the production of gypsum wallboard | Emerging Cross-Sectional Technologies | 37 | Expired |
| US4801355A | Tabular acicular gypsum and method of filling paper | Chemistry; Metallurgy | 5 | Expired |
| US5106600A | Process for producing tabular acicular gypsum crystals | Chemistry; Metallurgy | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.