H02P 9/42
To obtain desired frequency without varying speed of the generator
Official title: to obtain desired frequency without varying speed of the generator
H02P9/42 (To obtain desired frequency without varying speed of the generator) appears on 165 US grants and 113 published applications in this corpus.
Search patents in H02P- Granted patents
- 165
- Published applications
- 113
- Assignees
- 93
- Inventors
- 348
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 8 | 0 |
| 1988 | 3 | 0 |
| 1989 | 9 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 7 | 0 |
| 2000 | 3 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 2 |
| 2003 | 4 | 3 |
| 2004 | 2 | 6 |
| 2005 | 4 | 7 |
| 2006 | 4 | 3 |
| 2007 | 2 | 3 |
| 2008 | 4 | 9 |
| 2009 | 3 | 4 |
| 2010 | 3 | 4 |
| 2011 | 7 | 9 |
| 2012 | 3 | 2 |
| 2013 | 2 | 2 |
| 2014 | 5 | 5 |
| 2015 | 3 | 3 |
| 2016 | 3 | 9 |
| 2017 | 3 | 3 |
| 2018 | 3 | 3 |
| 2019 | 9 | 11 |
| 2020 | 7 | 8 |
| 2021 | 8 | 6 |
| 2022 | 5 | 4 |
| 2023 | 4 | 5 |
| 2024 | 3 | 1 |
| 2025 | 3 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Synchronous inverter22 Jul 2025US 12,368,399 B2Discovery Energy, LLC
- Combined machine for the thermic drying treatment of dielectric products22 Apr 2025US 12,281,364 B2Officine di Cartigliano S.p.A.
- Pump actuating device, and associated pumping system, aircraft and fuel supply method28 Jan 2025US 12,212,275 B2Safran Aircraft Engines
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- Closed-loop control device for closed-loop control of a power assembly including an internal combustion engine and a generator having an operative drive connection to the internal combustion engine, closed-loop control arrangement having such a closed-loop control device, power assembly and method for closed-loop control of a power assembly11 Apr 2024US 2024/0117776 A1Rolls-Royce Solutions GmbH
- Pump actuating device, and associated pumping system, aircraft and fuel supply method9 Nov 2023US 2023/0361699 A1Safran Aircraft Engines
- Energy packet control of generator prime mover and control processing24 Aug 2023US 2023/0268857 A1Schweitzer Engineering Laboratories, Inc.
- Combined machine for the thermic drying treatment of dielectric products29 Jun 2023US 2023/0203605 A1Officine di Cartigliano S.p.A.
- Variable speed pumping systems23 Feb 2023US 2023/0057451 A1HITACHl MITSUBISHl HYDRO CORPORATION
Most cited
By later US patents
- Performance optimization controller and control method for doubly-fed machines427US 5,798,631 AState of Oregon acting by and through the State Board of Higher Education on behalf of Oregon State University · 1998
- System and method for powering a hydraulic pump357US 8,997,904 B2General Electric Company · 2015
- Variable speed wind turbine with reduced power fluctuation and a static VAR mode of operation266US 5,225,712 AU.S. Windpower, Inc. · 1993
- Variable speed wind turbine245US 5,083,039 AU.S. Windpower, Inc. · 1992
- System and method for powering a hydraulic pump177US 9,579,980 B2General Electric Company · 2017