Lehnert; Charles W.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Lehnert; Charles W..The latest application filed is for "gypsum board and finishing system containing same".
- Lehnert; Charles W. - Fort Myers FL
- Lehnert; Charles W. - Stone Mountain GA
- Lehnert; Charles W. - Lake Oswego OR
| Patent | Date |
|---|---|
| Gypsum board and finishing system containing same Grant 5,791,109 - Lehnert , et al. August 11, 1 | 1998-08-11 |
| Finishing and roof deck systems containing fibrous mat-faced gypsum boards Grant 5,704,179 - Lehnert , et al. January 6, 1 | 1998-01-06 |
| Gypsum board and systems containing same Grant 5,644,880 - Lehnert , et al. July 8, 1 | 1997-07-08 |
| Use of fibrous mat-faced gypsum board in exterior finishing systems for buildings and shaft wall assemblies Grant 5,371,989 - Lehnert , et al. December 13, 1 | 1994-12-13 |
| Finishing and roof deck systems containing fibrous mat-faced gypsum boards Grant 5,319,900 - Lehnert , et al. * June 14, 1 | 1994-06-14 |
| Fibrous mat-faced gypsum board in exterior and interior finishing systems for buildings Grant 5,220,762 - Lehnert , et al. June 22, 1 | 1993-06-22 |
| Use of fibrous mat-faced gypsum board in shaft wall assemblies and improved fire resistant board Grant 5,148,645 - Lehnert , et al. September 22, 1 | 1992-09-22 |
| Fire-resistant door Grant 4,811,538 - Lehnert , et al. March 14, 1 | 1989-03-14 |
| Fibrous mat-faced gypsum board Grant 4,810,569 - Lehnert , et al. March 7, 1 | 1989-03-07 |
| Fire door Grant 4,748,771 - Lehnert , et al. June 7, 1 | 1988-06-07 |
| Fire resistant gypsum board Grant 4,722,866 - Wilson , et al. February 2, 1 | 1988-02-02 |
| Fire-resistant article and method of manufacture Grant 4,695,494 - Fowler, Jr. , et al. September 22, 1 | 1987-09-22 |
| Fire resistant gypsum composition Grant 4,664,707 - Wilson , et al. May 12, 1 | 1987-05-12 |
| Use of fibrous mat-faced gypsum board in exterior finishing systems for buildings Grant 4,647,496 - Lehnert , et al. March 3, 1 | 1987-03-03 |
| Fire door Grant 4,343,127 - Greve , et al. August 10, 1 | 1982-08-10 |
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