Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5768344 | Method and apparatus for screening telephone calls in response to an answering device beep tone | Richard Leifer | 1998-06-16 |
| 5692059 | Two active element in-the-ear microphone system | — | 1997-11-25 |