Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4621354 | DTMF receiver sense and control maintenance arrangement | Leo V. Jones, Jr. | 1986-11-04 |
| 4611325 | DTMF receiver sense and control arrangement | Leo V. Jones, Jr. | 1986-09-09 |