Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7755220 | Power stealing for a thermostat using a TRIAC with FET control | Scott A. Sorg, Timothy N. Comerford | 2010-07-13 |
| 5388153 | Apparatus and method for detecting telephone line status | Theodore O. Burger, John A. Karpicke, Donald Marion Keen, Thomas Anthony Stahl, Brian Albert Wittman | 1995-02-07 |
| 4847897 | Adaptive expander for telephones | — | 1989-07-11 |
| 4700382 | Voice-switched telephone circuit with center idle state | Robert Clair True, Noble E. Wickliff | 1987-10-13 |
| 4488006 | Apparatus for controlling the application of telephone line power in a telephone set | Terrence L. Essig, Donald D. Huizinga | 1984-12-11 |
| 4413159 | Dial pulsing circuit | Donald D. Huizinga, Edward W. Underhill | 1983-11-01 |