Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5638440 | Protection circuit for telephone systems | Michael A. Nix, Walter S. Schopfer | 1997-06-10 |
| 5636273 | Integrated ring detection circuit and power cross detection circuit with persistence timers | Walter S. Schopfer | 1997-06-03 |
| 5627536 | Multiplexed delta-sigma modulator | — | 1997-05-06 |