Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4562548 | Alarm limit recentering arrangement for maintaining uniform alarm limit tolerances about a sloping regulation characteristic | Brad Elwood Andersen, Robert E. Schroeder | 1985-12-31 |
| 4520437 | Power conversion circuit for synthesizing a sinewave with programmed amplitude control | Charles W. Boettcher, Jr., William M. Slak, Walter L. Zweig | 1985-05-28 |
| 4357572 | Current flare out limit control for PWM converter | Brad Elwood Andersen, Robert E. Schroeder | 1982-11-02 |
| 4355240 | Auxiliary backup regulator control for paralleled converter circuits controlled by a master regulator | — | 1982-10-19 |
| 4238688 | Three-phase uninterruptible power supply maintaining reserve energy sources in idling condition with unbalanced loads | Charles W. Boettcher, Jr., Walter L. Zweig | 1980-12-09 |