Issued Patents All Time
Showing 25 most recent of 48 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5621599 | Switched MOV device | Einar Vaughn Larsen, Murray A. Eitzmann | 1997-04-15 |
| 5338994 | Method and apparatus for achieving current balance in parallel connected switching devices | Georges R. E. Lezan | 1994-08-16 |
| 5091840 | Power conversion scheme employing shorting means to control current magnitude | — | 1992-02-25 |
| 5070440 | Power conversion scheme employing paralleled units | — | 1991-12-03 |
| 5051603 | Method and apparatus for matching turn-off times of parallel connected semiconductor switching devices | — | 1991-09-24 |
| 5041959 | Control system for a current source converter supplying an AC bus | — | 1991-08-20 |
| 4994981 | Method and apparatus for controlling a power converter | Russel G. Shiflett, Roy Anthony Carter | 1991-02-19 |
| 4775925 | Method and apparatus for determining the control electrode to cathode junction voltage of a control turn-off semiconductor device and use of such determined voltage in the control of the device | Georges R. E. Lezan | 1988-10-04 |
| 4641231 | Apparatus and method for failure testing of a control turn-off semiconductor | Georges R. E. Lezan | 1987-02-03 |
| 4609990 | Frequency measurement system | James W. Sember | 1986-09-02 |
| 4607206 | Flux control for induction motor drive using load commutated inverter circuit | James W. Sember, Herbert W. Weiss | 1986-08-19 |
| 4602198 | Induction motor drive using load commutated inverter circuit | Herbert W. Weiss | 1986-07-22 |
| 4602199 | Control for induction motor drive using load commutated inverter circuit | — | 1986-07-22 |
| 4602200 | Alternating current motor drive having current filter | — | 1986-07-22 |
| 4602206 | Capacitance control for a static var generator | — | 1986-07-22 |
| 4600874 | Excitation current control for induction motor drive using load commutated inverter circuit | Leland C. Tupper, Herbert W. Weiss, James W. Sember | 1986-07-15 |
| 4545002 | Thyristor voltage limiter for current source inverter | — | 1985-10-01 |
| 4507723 | Method for adaptive control in a power converter operating in a discontinuous current mode | William D. Brackman, Jr., John D. D'Atre | 1985-03-26 |
| 4496899 | Control for a force commutated current source var generator | David L. Lippitt | 1985-01-29 |
| 4475150 | Coordinated load commutated inverter protection system | John D. D'Atre, Paul M. Espelage, David L. Lippitt | 1984-10-02 |
| 4454470 | Method and apparatus for frequency measurement of an alternating current signal | Fred Henry Boettner | 1984-06-12 |
| 4451770 | Method and apparatus for determining the resistance of an AC motor stator | Fred Henry Boettner, John H. Cutler | 1984-05-29 |
| 4449088 | Commutation failure correction scheme for a controlled current inverter | John H. Cutler, John D. D'Atre | 1984-05-15 |
| 4449087 | Flux feedback firing control for a load commutated inverter | David L. Lippitt, Paul M. Espelage, Leland C. Tupper, Herbert W. Weiss | 1984-05-15 |
| 4441064 | Twelve-pulse operation of a controlled current inverter motor drive | John H. Cutler | 1984-04-03 |