Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8061129 | System and method to regenerate a diesel particulate filter | Jill N. Irlbeck, Erich Albert Lucht, John Hiemstra, Allan T. Hovda, John J. Shaw +7 more | 2011-11-22 |
| 4663837 | Apparatus for manufacturing a furnace heat exchanger and plate assembly | Russell W. Hoeffken | 1987-05-12 |
| 4538338 | Method for manufacturing a furnace heat exchanger and plate assembly | Russell W. Hoeffken | 1985-09-03 |
| 4394111 | Top cover, motor, fan and fan shroud assembly for an air conditioning unit | Russell W. Hoeffken | 1983-07-19 |