Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4942604 | Line power control circuit for pay station telephone | Benjamin A. Smith | 1990-07-17 |
| 4926468 | Pay station telephone coin box apparatus | Benjamin A. Smith | 1990-05-15 |
| 4926469 | Pay station telephone call routing apparatus | Benjamin A. Smith | 1990-05-15 |
| 4924497 | Pay station telephone interface circuits | Benjamin A. Smith | 1990-05-08 |
| 4916733 | Pay station telephone call answer supervision apparatus | Benjamin A. Smith | 1990-04-10 |
| 4777647 | Pay station telephone interface | Benjamin A. Smith | 1988-10-11 |