Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7643018 | Twisted pair communications line system | Steven F. Brown, Robert R. Asprey, Philip M. Kirshtein | 2010-01-05 |
| 7206348 | Twisted pair communications line system | Philip M. Kirshtein, Steven F. Brown, Robert R. Asprey | 2007-04-17 |
| 6377629 | Twisted pair communications line system | Philip M. Kirshtein, Steven F. Brown, Robert R. Asprey | 2002-04-23 |
| 5926509 | Twisted pair communicatons line system | Philip M. Kirshtein, Steven F. Brown, Robert R. Asprey | 1999-07-20 |