Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855572 | Heater for use as either primary or auxiliary heat source and improved circuitry for controlling the heater | Linus E. Wallgren, Bobby L. Mason, William J. Siegel, Louis A. Abbagnaro | 1989-08-08 |
| 4847471 | Heater for use as either primary or auxiliary heat source and improved circuitry for controlling the heater | Linus E. Wallgren, Bobby L. Mason, William J. Siegel, Louis A. Abbagnaro | 1989-07-11 |
| 4746816 | Spike detector circuitry | — | 1988-05-24 |
| 4639618 | Spike detector circuitry | — | 1987-01-27 |