Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4793322 | Direct-vented gas fireplace | Ronald J. Shimek | 1988-12-27 |
| 4424792 | Induced draft system for residential heaters | Ronald J. Shimek | 1984-01-10 |
| 4408594 | Fireplace heated grate | Ronald J. Shimek | 1983-10-11 |