Issued Patents All Time
Showing 26–33 of 33 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5371989 | Use of fibrous mat-faced gypsum board in exterior finishing systems for buildings and shaft wall assemblies | Charles W. Lehnert | 1994-12-13 |
| 5342680 | Glass mat with reinforcing binder | — | 1994-08-30 |
| 5319900 | Finishing and roof deck systems containing fibrous mat-faced gypsum boards | Charles W. Lehnert | 1994-06-14 |
| 5220762 | Fibrous mat-faced gypsum board in exterior and interior finishing systems for buildings | Charles W. Lehnert | 1993-06-22 |
| 5148645 | Use of fibrous mat-faced gypsum board in shaft wall assemblies and improved fire resistant board | Charles W. Lehnert, George F. Fowler, Ray W. Hinkel | 1992-09-22 |
| 4879173 | Glass mat with reinforcing binder | — | 1989-11-07 |
| 4810569 | Fibrous mat-faced gypsum board | Charles W. Lehnert | 1989-03-07 |
| 4647496 | Use of fibrous mat-faced gypsum board in exterior finishing systems for buildings | Charles W. Lehnert | 1987-03-03 |