Inventor
Frederick A. Stich
Inventor
Milwaukee, WI, US
Overview
Patents· 30 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H02Hprimary
H02HEmergency protective circuit arrangements15%
H02JElectric power networks13%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems13%
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters13%
H01HElectric switches11%
H01FMagnets7%
G05FSystems for regulating electric or magnetic variables6%
G01RMeasuring electric variables4%
H03KPulse technique4%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests4%
PatentTitleYear
7,595,614'Load tap changer'20096,266,260'Inverter having center switch and uninterruptible power supply implementing same'20015,790,391'Standby power system'19985,729,120'Dynamic voltage regulation stabilization for AC power supply systems'19985,615,129'Method and apparatus for adaptive and corrective determination of battery run-time in uninterruptible power systems'19975,602,462'Uninterruptible power system'19975,315,533'Back-up uninterruptible power system'19945,295,078'Method and apparatus for determination of battery run-time in uninterruptible power system'19945,229,651'Method and apparatus for line power monitoring for uninterruptible power supplies'19935,182,518'Inverter and battery testing for uninterruptible power systems'19935,160,832'Front panel unit for electronic equipment'19924,659,973'Brushless exciter for controlling excitation of a synchronous machine'19874,622,513'Gating of the thyristors in an arcless tap changing regulator'19864,539,618'Digitally controlled overload relay'19854,516,185'Time ratio control circuit for contactor or the like'19854,456,871'Power supply for electronic control system'19844,446,498'Electronic control system for overload relay or the like'19844,423,458'Signal processing system for overload relay or the like'19834,423,459'Solid state circuit protection system and method'19834,404,442'Circuit interrupter having flash plates with interrupted surfaces'19834,378,580'Conduction limit protection arrangement for power transistor switch'19834,363,060'Arcless tap changer for voltage regulator'19824,301,489'Arcless tap changer utilizing static switching'19814,128,793'Power circuit for variable frequency, variable magnitude power conditioning system'19784,123,692'Adjustable speed electric motor drive having constant harmonic content'19784,050,006'Inverter having constant frequency chopper synchronized to modulation frequency'19774,048,554'Variable frequency, variable voltage power supply'19773,971,972'Transistor inverter motor drive having voltage boost at low speeds'19763,967,173'Transistor bridge inverter motor drive having reduced harmonics'19763,931,553'Electronic commutation system having motor stator windings in push-pull'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–1983Patents assigned to ALLIS CHALMERS (8)· patent assignee history
1976–1987Based in Milwaukee, WI, US· patent location history
1981–1985Patents assigned to SIEMENS ALLIS INC (9)· patent assignee history
1986–1987Patents assigned to SIEMENS ENERGY & AUTOMAT (2)· patent assignee history
1992–1997Patents assigned to BEST POWER TECH INC (5)· patent assignee history
1992–2009Based in Wisconsin Rapids, WI, US· patent location history
1998Patents assigned to GEN SIGNAL CORP (2)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SIEMENS ALLIS INC | 9 | 1981–1985 |
| ALLIS CHALMERS | 8 | 1976–1983 |
| BEST POWER TECH INC | 5 | 1992–1997 |
| GEN SIGNAL CORP | 2 | 1998 |
| SIEMENS ENERGY & AUTOMAT | 2 | 1986–1987 |
Locations
| Location | Patents | Span |
|---|---|---|
| Milwaukee, WI, US | 19 | 1976–1987 |
| Wisconsin Rapids, WI, US | 11 | 1992–2009 |