Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5687908 | Non-condensing dual temperature combination space heating and hot water system | Sherwood G. Talbert, Jeffrey J. Crisafulli | 1997-11-18 |
| 4768444 | Common vent device for positive vent pressure and draft hood equipped gas appliances | Douglas W. DeWerth, James R. Deppisch, Sherwood G. Talbert | 1988-09-06 |