Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 5901212 | Apparatus for blocking voice band signals when receiving caller identification information for a waiting call | Brian Albert Wittman | 1999-05-04 | $106,039,000 |
| 4700382 | Voice-switched telephone circuit with center idle state | Donald R. Means, Noble E. Wickliff | 1987-10-13 |