Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6381153 | Method and apparatus of EMI filtering that eliminates the need for an inductor | — | 2002-04-30 |
| 4731818 | Self-computing credit card telephone paystation method and system | Robert A. Clark | 1988-03-15 |
| 4672661 | Credit card telephone station | Robert A. Clark | 1987-06-09 |