Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9631877 | Furnace heat exchanger coupling | Paul M. Haydock, Larry D. Rieke, Nitu Gupta, Scott A. Beck | 2017-04-25 |
| 9623471 | Furnace heat exchanger attachment | Paul M. Haydock, James J. Mitchum, John A. Wade, Stephen R. Carlisle | 2017-04-18 |
| 8220216 | Self louver opening | — | 2012-07-17 |
| 6851469 | Air baffle attachment to a heat exchanger | Merle D. Sears | 2005-02-08 |
| 6564795 | Air baffle attachment to a heat exchanger | Merle D. Sears | 2003-05-20 |
| 6497570 | Gas control assembly | Merle D. Sears, Rex R. Mills, Ninev Karl Zia, William Bruce Sutherlin | 2002-12-24 |
| 6474329 | Cell panel for furnace | Merle D. Sears, Brian A. Reeves | 2002-11-05 |