Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5960331 | Device and method for maintaining synchronization and frequency stability in a wireless telecommunication system | Steve Weir, Harbans Sehmar, Ronald Foerster, Warren Payne, Charles D. Petersen | 1999-09-28 |
| 4894860 | Trunk interface circuitry for telephone systems | Rajmund Krzyszczyk, Jin-tack LIM | 1990-01-16 |
| 4773068 | Dual channel transmission method and apparatus with inherent channel identification and extraction | — | 1988-09-20 |
| 4757521 | Synchronization method and apparatus for a telephone switching system | Chansak Laotetpitaks | 1988-07-12 |
| 4715062 | Speakerphone control circuit having low gain states and method for controlling gain of speakerphone | Raymond T. Pajer | 1987-12-22 |
| 4679228 | Speakerphone sensing circuit | Ronald M. Keenan | 1987-07-07 |
| 4577310 | Station interface for digital electronic telephone switching system having centralized digital audio processor | Chansak Laotetpitaks | 1986-03-18 |