Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6212177 | Remotely accessible key telephone system | Steven Greene | 2001-04-03 |
| 4777375 | Intrinsically safe matrix keypad having opto-couplers associated with each row and column of switches | — | 1988-10-11 |