Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D434745 | Pay telephone | Carl L. Engelbrecht, Doug Jones, Dean Depay, Andrew Hooper, Temujin Kuechie +1 more | 2000-12-05 |
| 5918181 | Method and apparatus for tracking location of wireless terminals in a nanocellular digital cordless terminal network coupled to a local exchange | Theresa A. Foster | 1999-06-29 |
| 5511090 | Wireless frequency-division-multiple-access direct sequence spread spectrum telephone system | D. Darryl Denton | 1996-04-23 |
| 4782937 | Escrow device for coin-operated systems | Abraham Y. Chen | 1988-11-08 |