Issued Patents All Time
Showing 1–14 of 14 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6223877 | Coin validation apparatus | Joseph McGinty, Steven Michael Faes, Gregory L. Distler, Eugene Gray Heathershaw | 2001-05-01 |
| 5737401 | Full coin box signalling device for use with coin telephones | Gregory L. Distler | 1998-04-07 |
| 5084613 | Electronic circuit for telephone paystation coin operated trigger | — | 1992-01-28 |
| 4988860 | Electronic trigger for prepay type telephone paystations | William M. Wollet | 1991-01-29 |
| 4903294 | Low voltage operated coin relay | Attle D. Johnson | 1990-02-20 |
| 4896348 | Paystation monitor circuit to prevent fraudulent use | Attle D. Johnson | 1990-01-23 |
| 4831650 | Adaptive telephone receive control | — | 1989-05-16 |
| 4821313 | Paystation transmitter ground detect circuitry | — | 1989-04-11 |
| 4454385 | Latching relay hold release circuit for a telephone instrument | Eduard F. B. Boeckmann | 1984-06-12 |
| 4447674 | Electronic hold release circuit | Hugh S. Montgomery, Eduard F. B. Boeckmann, Larry A. Woodworth | 1984-05-08 |
| 4442322 | Electronic common switch having an improved receiver mating arrangement | — | 1984-04-10 |
| 4440981 | Electronic hold circuit | Hugh S. Montgomery, Eduard F. B. Boeckmann, Larry A. Woodworth | 1984-04-03 |
| 4435622 | Latching relay hold circuit for a telephone instrument | Eduard F. B. Boeckmann | 1984-03-06 |
| 4309573 | Loudspeaking substation circuit | Larry A. Woodworth | 1982-01-05 |