Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4829554 | Cellular mobile telephone system and method | Michael Barnes, Kenneth L. Hagstrom, George Helm, Anthony R. A. Keane, Roger Pawlowski +4 more | 1989-05-09 |
| 4320522 | Programmable frequency and signalling format tone frequency encoder/decoder circuit | — | 1982-03-16 |