Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7026729 | Exhaust fan timeout system | Timothy C. Homan | 2006-04-11 |
| 6816009 | Circuit and method for a transimpedance audio amplifier providing variable gain while maintaining load impedance | William E. Hughes | 2004-11-09 |
| 5930374 | Phase coherent crossover | Donn R. Werrbach | 1999-07-27 |
| 4868858 | Keypad/dialler interface for telephone test set | — | 1989-09-19 |
| 4777645 | Telephone line test and display circuit | James D. Eckman, Leonard E. Curtin, Chuck Muir | 1988-10-11 |
| 4764949 | Subscriber/craftsperson ringback apparatus | Len Curtin | 1988-08-16 |
| 4747133 | Telephone light adapter | Joseph F. Valenzona | 1988-05-24 |
| 4682346 | Telephone test set | Thomas W. Durston | 1987-07-21 |
| 4524331 | High input impedance amplifier circuit | — | 1985-06-18 |