Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879173 | Glass mat with reinforcing binder | — | 1989-11-07 |
| 4810569 | Fibrous mat-faced gypsum board | Charles W. Lehnert | 1989-03-07 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879173 | Glass mat with reinforcing binder | — | 1989-11-07 |
| 4810569 | Fibrous mat-faced gypsum board | Charles W. Lehnert | 1989-03-07 |