Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6299970 | Fire-resistant gypsum fiberboard | Hubert C. Francis, George F. Fowler | 2001-10-09 |
| 5945208 | Fire-resistant gypsum building materials | Hubert C. Francis, George F. Fowler | 1999-08-31 |
| 5798010 | Methods of preparing fire doors | Hubert C. Francis, George F. Fowler | 1998-08-25 |
| 5632848 | Continuous processing equipment for making fiberboard | Hubert C. Francis, George F. Fowler, Dale R. Greve, Edward Rigby | 1997-05-27 |
| 5347780 | Gypsum fiberboard door frame | Hubert C. Francis, George F. Fowler | 1994-09-20 |
| 5305577 | Fire-resistant structure containing gypsum fiberboard | Hubert C. Francis, George F. Fowler | 1994-04-26 |
| 5171366 | Gypsum building product | Hubert C. Francis, George F. Fowler | 1992-12-15 |
| 5155959 | Firedoor constructions including gypsum building product | Hubert C. Francis, George F. Fowler | 1992-10-20 |
| 5135805 | Method of manufacturing a water-resistant gypsum composition | Dwight G. Sellers, Franklin A. Altman | 1992-08-04 |