H01F 38/24
Voltage transformers
H01F38/24 (Voltage transformers) appears on 40 US grants and 33 published applications in this corpus.
Search patents in H01F- Granted patents
- 40
- Published applications
- 33
- Assignees
- 33
- Inventors
- 112
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
| 2004 | 1 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 0 |
| 2009 | 0 | 2 |
| 2010 | 0 | 1 |
| 2011 | 2 | 0 |
| 2012 | 0 | 2 |
| 2013 | 0 | 0 |
| 2014 | 1 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 2 |
| 2018 | 0 | 1 |
| 2019 | 3 | 4 |
| 2020 | 2 | 2 |
| 2021 | 1 | 2 |
| 2022 | 4 | 6 |
| 2023 | 1 | 3 |
| 2024 | 2 | 0 |
| 2025 | 2 | 2 |
| 2026 | 4 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- HV apparatus and a method of manufacturing such apparatus15 Sep 2026US 12,738,415 B2Hitachi Energy Ltd
- Power supply module and transformer power supply device16 Jun 2026US 12,658,820 B2Delta Electronics (Shanghai) Co., Ltd.
- Instrument transformer and method to isolate parts2 Jun 2026US 12,646,650 B2HSP Hochspannungsgeräte GmbH
- Dry high voltage instrument transformer7 Apr 2026US 12,597,557 B2ABB Schweiz AG
- Adaptive control electromagnetic induction energy harvesting method and system for a power transmission line27 May 2025US 12,316,129 B1State Grid Shanghai Municipal Electric Power Company
- Method for operating an electrolysis system, related controller, power supply and electrolyzer system23 Jul 2026US 2026/0209964 A1Siemens Energy Global GmbH & Co. KG
- Low-power voltage transformer having temperature compensation applied thereto, and temperature compensation method thereof16 Jul 2026US 2026/0202449 A1Hyosung Heavy Industries Corporation
- Coated active component in a high-voltage device and method for increasing the di-electric strength23 Oct 2025US 2025/0327841 A1HSP Hochspannungsgeräte GmbH
- Fuse tripping acceleration arrangement, current transformer arrangement and energy storage system20 Mar 2025US 2025/0095911 A1
- Voltage generator27 Jul 2023US 2023/0238175 A1Mitsubishi Electric Corporation
Most cited
By later US patents
- Electrical revenue meter and instrument transformers mobile station36US 6,696,925 B1Lynn-Edward Professional Services, Inc. · 2004
- Transformer having improved voltage and phase characteristics8US 3,943,435 AGeneral Electric Company · 1976
- Orthogonal radio frequency voltage/current sensor with high dynamic range7US 8,040,141 B2MKS Instruments, Inc. · 2011
- Cast-resin insulated instrument transformer, in particular potential transformer6US 3,953,815 A1976
- Precision measurement voltage transducer6US 4,628,251 ALGZ Landis & Gyr Zug AG · 1986