Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5369697 | Method and apparatus for automatically switching between pulse code and DTMF signals generated by a telephone | David F. Hemmings, David S. Gergacz | 1994-11-29 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5369697 | Method and apparatus for automatically switching between pulse code and DTMF signals generated by a telephone | David F. Hemmings, David S. Gergacz | 1994-11-29 |