Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5953407 | Distinctive ringing and distinctive call-waiting tones in an | Genzao Zhang, Howard M. Sandler | 1999-09-14 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5953407 | Distinctive ringing and distinctive call-waiting tones in an | Genzao Zhang, Howard M. Sandler | 1999-09-14 |