Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4311875 | Interface system isolating a subscriber subset from a telephone switching system | — | 1982-01-19 |
| 4255618 | Digital intercept recorder/announcer system | Gary J. Kiel | 1981-03-10 |