Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4527080 | Digital phase and frequency comparator circuit | — | 1985-07-02 |
| 4520437 | Power conversion circuit for synthesizing a sinewave with programmed amplitude control | Charles W. Boettcher, Jr., Billy H. Hamilton, William M. Slak | 1985-05-28 |
| 4238688 | Three-phase uninterruptible power supply maintaining reserve energy sources in idling condition with unbalanced loads | Charles W. Boettcher, Jr., Billy H. Hamilton | 1980-12-09 |