Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4512453 | Vendor accountability system | Paul K. Griner, Nai H. Mak | 1985-04-23 |
| 4512454 | Coin apparatus having coin escrow and return means | Barry L. Smith, Paul K. Griner | 1985-04-23 |
| 4499985 | Vendor change return control | — | 1985-02-19 |
| 4462512 | Change making system | — | 1984-07-31 |
| 4286703 | Coin testing and sorting apparatus | Harry C. Haeusser | 1981-09-01 |
| 4231105 | Vendor control circuit | Paul N. Albrecht, Hugo M. Canizares | 1980-10-28 |
| 4192436 | Article dispensing apparatus particularly for use for dispensing food | Harry C. Haeusser | 1980-03-11 |