Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7702999 | Network-based, information management system and method | Scott Wessels | 2010-04-20 |
| 4851162 | Evaporative cooler | Charles J. Sperr, Jr. | 1989-07-25 |
| 4752419 | Evaporative cooler | Charles J. Sperr, Jr. | 1988-06-21 |
| D296242 | Mullion | — | 1988-06-14 |
| 4576013 | Evaporative cooling | Charles J. Sperr, Jr., Thad J. Genrich | 1986-03-18 |
| 4379712 | Evaporative cooler | Charles J. Sperr, Jr. | 1983-04-12 |