Issued Patents All Time
Showing 26–36 of 36 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5577104 | Method for system and message activation based on distinctive ringing | Stephen B. Knuth, James W. Mazzolini, Sanford M. Brown, III | 1996-11-19 |
| 5526424 | Electronic notepad | — | 1996-06-11 |
| 5432844 | Shared line answering system with enhanced extension device features | Kenneth R. Core, Stephen B. Knuth | 1995-07-11 |
| RE34968 | Handset or speaker message retrieval system | Eskandar Afshar | 1995-06-13 |
| 5400393 | Voice mail digital telephone answering device | Stephen B. Knuth, Sanford M. Brown, III | 1995-03-21 |
| 5392332 | Shared line telephone answering system with a telephone line-powered disconnect module | Kenneth R. Core, Stephen B. Knuth | 1995-02-21 |
| 5313516 | Telephone answering device with automatic function | Eskandar Afshar | 1994-05-17 |
| 5289529 | Means for improving the dynamic range of an analog/digital converter in a digital telephone answering machine | — | 1994-02-22 |
| 5163082 | Memory management methods and apparatus for digital telephone answering devices | — | 1992-11-10 |
| 5111500 | Handset or speaker message retrieval system | Eskandar Afshar | 1992-05-05 |
| 5101426 | Telephone answering device with improved end signal detection | Eskandar Afshar | 1992-03-31 |