Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6377426 | Gas furnace with variable speed draft inducer | Robert W. Helt, Leonard W. Holmes, James T. Vershaw, Timothy Wayne Storm | 2002-04-23 |
| 6257870 | Gas furnace with variable speed draft inducer | Robert W. Helt, Leonard W. Holmes, James T. Vershaw, Timothy Wayne Storm | 2001-07-10 |