G05F 1/13
Using ferroresonant transformers as final control devices
Official title: using ferroresonant transformers as final control devices
G05F1/13 (Using ferroresonant transformers as final control devices) appears on 22 US grants and 6 published applications in this corpus.
Search patents in G05F- Granted patents
- 22
- Published applications
- 6
- Assignees
- 18
- Inventors
- 47
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 1 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Photovoltaic converter and photovoltaic generation system28 Jul 2026US 12,695,027 B2Huawei Digital Power Technologies Co., Ltd.
- Stackable isolated voltage optimization module26 Oct 2021US 11,159,091 B2Georgia Tech Research Corporation
- Current regulator with feedback circuit for AC coupling24 Jul 2018US 10,032,555 B2Halliburton Energy Services.Inc.
- Dynamic voltage restoration system and method25 Apr 2017US 9,634,490 B2General Electric Company
- Regulated power supply unit with an electronic transformer17 Mar 1998US 5,729,445 ALeica Mikroskopie und Systeme GmbH
- Photovoltaic converter and photovoltaic generation system1 Aug 2024US 2024/0258026 A1Huawei Digital Power Technologies Co., Ltd.
- Electrical grid transformer system23 Mar 2023US 2023/0087549 A1AMPX Limited
- Stackable isolated voltage optimization module8 Oct 2020US 2020/0321882 A1Georgia Tech Research Corporation
- Three-phase transformer27 Jun 2019US 2019/0198238 A1U.T.T. Unique Transformer Technologies Ltd
- Current regulator with feedback circuit for ac coupling13 Oct 2016US 2016/0301321 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Resonant power supplies188US 5,450,305 AAuckland Uniservices Limited · 1995
- Uninterruptible power supply with load regulation of standby voltage source47US 4,313,060 ABell Telephone Laboratories, Incorporated · 1982
- Ferroresonant constant AC voltage transformer47US 4,862,059 ANishimu Electronics Industries Co., Ltd. · 1989
- Ferroresonant three-phase constant AC voltage transformer arrangement with compensation for unbalanced loads35US 4,893,069 ANishimu Electronics Industries Co., Ltd. · 1990
- Controlled ferroresonant voltage regulator providing immunity from sustained oscillations23US 4,465,966 AMotorola, Inc. · 1984