Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6182653 | Exhaust hood | James T. Otenbaker | 2001-02-06 |
| 6058929 | Adjustable exhaust hood with air curtain | — | 2000-05-09 |
| 5522377 | Adjustable exhaust hood | — | 1996-06-04 |
| 5292353 | Air scrubber | Arnold S. Kaufman, Robert L. Anderson, Donald W. Alwood, James T. Otenbaker | 1994-03-08 |
| 4484563 | Air ventilation and pollution cleaning system | Ralph L. Daigle | 1984-11-27 |
| 4483316 | Air ventilation system | Ralph L. Daigle | 1984-11-20 |
| 4323373 | Apparatus and method for cleaning air | — | 1982-04-06 |