Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11833286 | Filter and frame apparatus and method of use | William M. Appling, Stephen N. Engelhard | 2023-12-05 |
| 11083831 | Filter and frame apparatus and method of use | William M. Appling, Stephen N. Engelhard | 2021-08-10 |
| 10195334 | Filter and frame apparatus and method of use | William M. Appling, Stephen N. Engelhard | 2019-02-05 |
| 9314561 | Filter and frame apparatus and method of use | William M. Appling, Stephen N. Engelhard | 2016-04-19 |
| D708749 | Dual filter | William M. Appling | 2014-07-08 |