Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4801355 | Tabular acicular gypsum and method of filling paper | Norman E. Johnstone, John C. Gaynor | 1989-01-31 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4801355 | Tabular acicular gypsum and method of filling paper | Norman E. Johnstone, John C. Gaynor | 1989-01-31 |