Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4563548 | Method and circuit for telephone dialing signal generation | Russell J. Apfel, Arthur F. Lange | 1986-01-07 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4563548 | Method and circuit for telephone dialing signal generation | Russell J. Apfel, Arthur F. Lange | 1986-01-07 |