Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6819761 | Programmable constant current “off hook” circuit | — | 2004-11-16 |
| 6700974 | Switching power supply for generating a ringing voltage | — | 2004-03-02 |
| 4233800 | Envelope opener | William J. Long, Larry W. Roberts | 1980-11-18 |