Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4425480 | Telephone station apparatus with selective restricting of local calls | — | 1984-01-10 |
| 4199659 | Electronic prepay adapter circuit for central office telephone equipment | — | 1980-04-22 |
| 4198545 | Automatic call timing telephone apparatus | Melval C. Haist | 1980-04-15 |