Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5641342 | Interlock between cells of an electronic air cleaner | Ronald R. Smith | 1997-06-24 |
| 5628818 | Electronic air cleaner cell containment structure | Ronald R. Smith | 1997-05-13 |
| D359698 | Thermostat | Peter G. Pierret, Mark Dziersk | 1995-06-27 |
| D359459 | Thermostat | William O. Shreeve, Mark Dziersk | 1995-06-20 |