Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4550226 | Subscriber's telephone circuit arranged to present constant impedance to a telephone line | — | 1985-10-29 |
| 4492823 | Dual timing circuit for telephone subscriber's instrument | Miranda L. James | 1985-01-08 |