Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5699421 | Telephone answering device with low cost dual tone multi-frequency detector | Mark J. Karnowski, Frank Sacca | 1997-12-16 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5699421 | Telephone answering device with low cost dual tone multi-frequency detector | Mark J. Karnowski, Frank Sacca | 1997-12-16 |