Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D263956 | Acoustical enclosure for teleprinters or the like | Donald R. Cunningham | 1982-04-20 |
| 4215762 | Acoustical enclosure | Donald R. Cunningham | 1980-08-05 |
| 4213516 | Acoustical wall panel | — | 1980-07-22 |
| 4185167 | Sound masking package | Donald R. Cunningham | 1980-01-22 |