Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4856055 | Controllable telephone annunciator | — | 1989-08-08 |
| 4852129 | Data compression system using frequency band translation and intermediate sample extrapolation | — | 1989-07-25 |
| 4825451 | Technique for transmission of voice communications and apparatus useful therein | — | 1989-04-25 |
| 4805208 | Modem compression system for telephone network | — | 1989-02-14 |