Patents per Year
Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 6233325 | Calling party identification announcement service | Dewey Alcott Frech, John B. Reid, Anton Roug | 2001-05-15 | $37,602,000 |
| 5729592 | Calling party identification announcement service | Dewey Alcott Frech, John B. Reid, Anton Johannes Roug | 1998-03-17 | $29,792,000 |
| 5640319 | Switch control methods and apparatus | Brian George Beuning, Seymour Bloom, Raymond Eugene Bright, Jr., Steven L. Greenspan, Joel M. Marks +2 more | 1997-06-17 | $49,427,000 |
| 5109408 | Arrangement for intentionally blocking telephone calls to predefined destination numbers but allowing such blocking to be selectively overridden | Steven L. Greenspan, Joel M. Marks | 1992-04-28 |