Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4912390 | Apparatus for controlling firing of thyristors relative to a current reaching zero by using a microcomputer and hardware responsive to voltage crossing zero | James T. Libert | 1990-03-27 |
| 4833628 | Up to speed detector for an electric motor using measured values of the current lag; and voltage ramp controller using the up to speed indication | — | 1989-05-23 |
| 4823226 | Phase loss detection circuit including transient protection | Ryan T. Reed | 1989-04-18 |
| 4710692 | Self calibration of the thyristor firing angel of a motor controller using a current window to determine a final value of a reference current lag phase angle | James T. Libert | 1987-12-01 |
| 4634951 | Reduced voltage starter with voltage ramp control | Julian C. Kampf, Jeffrey A. Reichard, James T. Libert, Richard J. Graefe | 1987-01-06 |
| 4520304 | Three phase scaling current-to-voltage convertor | — | 1985-05-28 |