Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7471787 | Method of operating a distributed call progress tone detection system | L. David Chambers, James G. Osborn | 2008-12-30 |
| 7043006 | Distributed call progress tone detection system and method of operation thereof | L. David Chambers, James G. Osborn | 2006-05-09 |