Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5771647 | Grille assembly and related method | Tony J. Kempen | 1998-06-30 |
| 5117745 | Safety lock | Richard C. Burke | 1992-06-02 |
| 4858520 | Auxiliary frame for ceiling mounted air diffusers and the like | Richard C. Burke | 1989-08-22 |
| 4817508 | Opposed blade balanced damper | — | 1989-04-04 |