Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6061438 | Extension-in-use exclusion apparatus | Francis Shen, Grigor K. Kotzev | 2000-05-09 |
| 5812649 | Method and apparatus for supporting spontaneous call waiting identification | — | 1998-09-22 |
| 5764758 | Interrupted tone converter | — | 1998-06-09 |
| 5546451 | Call waiting cancellation device | — | 1996-08-13 |
| 5481594 | Audio caller identification unit | Francis Shen, Eric Edwards, Gerrard B. Schmid, Grigor K. Kotzev | 1996-01-02 |
| 5035936 | Loose fill insulation product comprising mineral wool nodules | Mark Brian Dockrill, John Buckham | 1991-07-30 |
| 4997681 | Mineral fiber nodules and method of making same | Mark Brian Dockrill, John Buckham | 1991-03-05 |