Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5414758 | Audio recording apparatus using an imperfect memory circuit | — | 1995-05-09 |
| 5259022 | Detector for use with an automatic disconnect feature in a telephone answering machine | John Livingston, Frank D. Jaskulski | 1993-11-02 |
| 5177783 | Switching circuit in a telephone device for selecting between two-line and keysystem modes of operation | John Livingston | 1993-01-05 |
| 4926461 | Telephone answering machine having call transfer capabilities | — | 1990-05-15 |