Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860345 | Telephone system and method operated from central office loop current | — | 1989-08-22 |
| 4860346 | Telephone system and method operated from central office loop current | — | 1989-08-22 |
| 4759050 | Intelligent toll telephone system and method | — | 1988-07-19 |
| 4759054 | Toll telephone system and method for maintaining or initiating loop current after resuming on-hook condition | — | 1988-07-19 |
| 4336422 | Toll restrictor | — | 1982-06-22 |