G05F 1/12
Wherein the variable actually regulated by the final control device is ac
Official title: wherein the variable actually regulated by the final control device is AC (G05F1/625 takes precedence)
G05F1/12 (Wherein the variable actually regulated by the final control device is ac) appears on 907 US grants and 524 published applications in this corpus.
Search patents in G05F- Granted patents
- 907
- Published applications
- 524
- Assignees
- 518
- Inventors
- 1,584
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 38 | 0 |
| 1977 | 26 | 0 |
| 1978 | 16 | 0 |
| 1979 | 21 | 0 |
| 1980 | 13 | 0 |
| 1981 | 21 | 0 |
| 1982 | 21 | 0 |
| 1983 | 13 | 0 |
| 1984 | 15 | 0 |
| 1985 | 8 | 0 |
| 1986 | 12 | 0 |
| 1987 | 18 | 0 |
| 1988 | 6 | 0 |
| 1989 | 17 | 0 |
| 1990 | 16 | 0 |
| 1991 | 13 | 0 |
| 1992 | 20 | 0 |
| 1993 | 13 | 0 |
| 1994 | 15 | 0 |
| 1995 | 15 | 0 |
| 1996 | 28 | 0 |
| 1997 | 16 | 0 |
| 1998 | 15 | 0 |
| 1999 | 7 | 0 |
| 2000 | 13 | 0 |
| 2001 | 10 | 2 |
| 2002 | 10 | 5 |
| 2003 | 2 | 7 |
| 2004 | 4 | 14 |
| 2005 | 12 | 21 |
| 2006 | 8 | 9 |
| 2007 | 5 | 8 |
| 2008 | 10 | 10 |
| 2009 | 11 | 10 |
| 2010 | 9 | 13 |
| 2011 | 8 | 15 |
| 2012 | 10 | 13 |
| 2013 | 20 | 25 |
| 2014 | 13 | 32 |
| 2015 | 25 | 27 |
| 2016 | 39 | 33 |
| 2017 | 38 | 32 |
| 2018 | 31 | 38 |
| 2019 | 48 | 53 |
| 2020 | 36 | 37 |
| 2021 | 31 | 36 |
| 2022 | 40 | 32 |
| 2023 | 38 | 21 |
| 2024 | 20 | 8 |
| 2025 | 7 | 14 |
| 2026 | 6 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- G05F 1/40Using discharge tubes or semiconductor devices as final control devices389
- G05F 1/14Using tap transformers or tap changing inductors as final control devices224
- G05F 1/32Using magnetic devices having a controllable degree of saturation as final control123
- G05F 1/24Using bucking or boosting transformers as final control devices83
- G05F 1/13Using ferroresonant transformers as final control devices22
Recent patents
- Transformer-hybrid variable reactance6 Oct 2026US 12,754,576 B2Clark Power Systems, Inc.
- Method and apparatus for identifying proper regulation method based on average voltage change between tap steps for voltage regulators11 Aug 2026US 12,704,865 B2Hubbell Incorporated
- Photovoltaic converter and photovoltaic generation system28 Jul 2026US 12,695,027 B2Huawei Digital Power Technologies Co., Ltd.
- Smart switch with functionalities determined based on a grounded conductor connection14 Jul 2026US 12,681,514 B2Roku, Inc.
- Techniques for predictive control of energy use in a structure14 Jul 2026US 12,683,395 B2Elexity, Inc.
- Smart switch with functionalities determined based on a grounded conductor connection8 Oct 2026US 2026/0310248 A1Roku, Inc.
- Ac-side active common-mode filter for inverters30 Jul 2026US 2026/0221923 A1
- Dynamic power flow controller (dpfc) for regulating power flow in a power transmission line25 Jun 2026US 2026/0178063 A1
- Power regulator4 Jun 2026US 2026/0153541 A1Autonics Corporation
- Power consumption amount adjustment device, numerical control device, and power consumption amount adjustment method30 Apr 2026US 2026/0118899 A1Mitsubishi Electric Corporation
Most cited
By later US patents
- Uninterruptible power system402US 5,602,462 ABest Power Technology, Inc. · 1997
- Programmed control module for inductive coupling to a wall switch244US 5,264,761 ABeacon Light Products, Inc. · 1993
- Resonant power supplies188US 5,450,305 AAuckland Uniservices Limited · 1995
- Method and apparatus for automatic voltage reduction control186US 4,346,341 AGeneral Electric Company · 1982
- Microcontroller-based tap changer controller employing half-wave digitization of A.C. signals136US 5,581,173 ABeckwith Electric Co., Inc. · 1996