Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33309 | Telephone handset amplifier circuit | David O. Hanon | 1990-08-21 |
| 4584702 | Noise cancelling telephone transmitter insertable in telephone handset receptacle | — | 1986-04-22 |
| D280504 | Handset telephone | — | 1985-09-10 |
| 4466120 | Telephone handset amplifier circuit | David O. Hanon | 1984-08-14 |
| D274516 | Telephone handset transmitter cup | — | 1984-07-03 |
| D274429 | Telephone handset transmitter cup | — | 1984-06-26 |
| 4449236 | Anti-side tone transmitter | — | 1984-05-15 |
| 4191861 | Telephone amplifier | — | 1980-03-04 |