Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4995075 | Apparatus and method for encoding telephone ringing signals | Linda Roberts | 1991-02-19 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4995075 | Apparatus and method for encoding telephone ringing signals | Linda Roberts | 1991-02-19 |