Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6299970 | Fire-resistant gypsum fiberboard | Turner W. Richards, Hubert C. Francis | 2001-10-09 |
| 5945182 | Fire-resistant members containing gypsum fiberboard | Peter Edward Jackman, Kevin D. S. Towler | 1999-08-31 |
| 5945208 | Fire-resistant gypsum building materials | Turner W. Richards, Hubert C. Francis | 1999-08-31 |
| 5798010 | Methods of preparing fire doors | Turner W. Richards, Hubert C. Francis | 1998-08-25 |
| 5632848 | Continuous processing equipment for making fiberboard | Turner W. Richards, Hubert C. Francis, Dale R. Greve, Edward Rigby | 1997-05-27 |
| 5601888 | Fire-resistant members containing gypsum fiberboard | — | 1997-02-11 |
| 5347780 | Gypsum fiberboard door frame | Turner W. Richards, Hubert C. Francis | 1994-09-20 |
| 5305577 | Fire-resistant structure containing gypsum fiberboard | Turner W. Richards, Hubert C. Francis | 1994-04-26 |
| 5171366 | Gypsum building product | Turner W. Richards, Hubert C. Francis | 1992-12-15 |
| 5155959 | Firedoor constructions including gypsum building product | Turner W. Richards, Hubert C. Francis | 1992-10-20 |
| 5148645 | Use of fibrous mat-faced gypsum board in shaft wall assemblies and improved fire resistant board | Charles W. Lehnert, Brian G. Randall, Ray W. Hinkel | 1992-09-22 |
| 4811538 | Fire-resistant door | Charles W. Lehnert | 1989-03-14 |
| 4695494 | Fire-resistant article and method of manufacture | Charles W. Lehnert | 1987-09-22 |