Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |