| Patent | Date |
|---|
Load tap changer
Grant 7,595,614 - Stich , et al. September 29, 2 | 2009-09-29 |
Load Tap Changer
App 20090146637 - Stich; Frederick A. ; et al. | 2009-06-11 |
Inverter having center switch and uninterruptible power supply implementing same
Grant 6,266,260 - Zahrte, Sr. , et al. July 24, 2 | 2001-07-24 |
Standby power system
Grant 5,790,391 - Stich , et al. August 4, 1 | 1998-08-04 |
Dynamic voltage regulation stabilization for AC power supply systems
Grant 5,729,120 - Stich , et al. March 17, 1 | 1998-03-17 |
Method and apparatus for adaptive and corrective determination of battery run-time in uninterruptible power systems
Grant 5,615,129 - Stich , et al. March 25, 1 | 1997-03-25 |
Uninterruptible power system
Grant 5,602,462 - Stich , et al. February 11, 1 | 1997-02-11 |
Back-up uninterruptible power system
Grant 5,315,533 - Stich , et al. May 24, 1 | 1994-05-24 |
Method and apparatus for determination of battery run-time in uninterruptible power system
Grant 5,295,078 - Stich , et al. March 15, 1 | 1994-03-15 |
Method and apparatus for line power monitoring for uninterruptible power supplies
Grant 5,229,651 - Baxter, Jr. , et al. July 20, 1 | 1993-07-20 |
Inverter and battery testing for uninterruptible power systems
Grant 5,182,518 - Stich , et al. January 26, 1 | 1993-01-26 |
Front panel unit for electronic equipment
Grant 5,160,832 - Hubert , et al. November 3, 1 | 1992-11-03 |
Brushless exciter for controlling excitation of a synchronous machine
Grant 4,659,973 - Stich April 21, 1 | 1987-04-21 |
Gating of the thyristors in an arcless tap changing regulator
Grant 4,622,513 - Stich November 11, 1 | 1986-11-11 |
Digitally controlled overload relay
Grant 4,539,618 - Stich September 3, 1 | 1985-09-03 |
Power supply for electronic control system
Grant 4,456,871 - Stich June 26, 1 | 1984-06-26 |
Electronic control system for overload relay or the like
Grant 4,446,498 - Stich May 1, 1 | 1984-05-01 |
Solid state circuit protection system and method
Grant 4,423,459 - Stich , et al. December 27, 1 | 1983-12-27 |
Conduction limit protection arrangement for power transistor switch
Grant 4,378,580 - Stich March 29, 1 | 1983-03-29 |
Arcless tap changer for voltage regulator
Grant 4,363,060 - Stich December 7, 1 | 1982-12-07 |
Arcless tap changer utilizing static switching
Grant 4,301,489 - Stich November 17, 1 | 1981-11-17 |
Adjustable speed electric motor drive having constant harmonic content
Grant 4,123,692 - Gilmore , et al. October 31, 1 | 1978-10-31 |
Variable frequency, variable voltage power supply
Grant 4,048,554 - Stich September 13, 1 | 1977-09-13 |
Transistor inverter motor drive having voltage boost at low speeds
Grant 3,971,972 - Stich July 27, 1 | 1976-07-27 |
Transistor bridge inverter motor drive having reduced harmonics
Grant 3,967,173 - Stich June 29, 1 | 1976-06-29 |
Electronic commutation system having motor stator windings in push-pull
Grant 3,931,553 - Stich , et al. January 6, 1 | 1976-01-06 |
Control Having Conduction Limit Means To Vary Duty Cycle Of Power Switch
Grant 3,855,520 - Stich December 17, 1 | 1974-12-17 |
Electronically Commutated Motor
Grant 3,840,790 - Stich , et al. October 8, 1 | 1974-10-08 |
Variable Duty Cycle Traction Motor Control Providing Controlled Plugging
Grant 3,828,235 - Price , et al. August 6, 1 | 1974-08-06 |
Variable Time Ratio Control Having Speed Potentiometer Failure Protection
Grant 3,803,473 - Stich April 9, 1 | 1974-04-09 |
Control For Commutatorless Motor
Grant 3,784,888 - Geiersbach , et al. January 8, 1 | 1974-01-08 |
Capacitive Position Sensor
Grant 3,760,392 - Stich September 18, 1 | 1973-09-18 |
Phase Shift Detector
Grant 3,700,919 - Stich October 24, 1 | 1972-10-24 |
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