Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5273151 | Resonant coil coin detection apparatus | Ralph H. Carmen | 1993-12-28 |
| 5244070 | Dual coil coin sensing apparatus | Ralph H. Carmen | 1993-09-14 |
| 5155614 | Low-power demodulating receiver with amplifier stages sharing the same bias current | Ralph H. Carmen | 1992-10-13 |