H01F 29/025
Constructional details of transformers or reactors with tapping on coil or windings
Official title: {Constructional details of transformers or reactors with tapping on coil or windings}
H01F29/025 (Constructional details of transformers or reactors with tapping on coil or windings) appears on 57 US grants and 78 published applications in this corpus.
Search patents in H01F- Granted patents
- 57
- Published applications
- 78
- Assignees
- 52
- Inventors
- 222
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 1 |
| 2005 | 2 | 5 |
| 2006 | 1 | 2 |
| 2007 | 3 | 2 |
| 2008 | 1 | 2 |
| 2009 | 2 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 1 |
| 2012 | 1 | 0 |
| 2013 | 0 | 2 |
| 2014 | 0 | 3 |
| 2015 | 1 | 1 |
| 2016 | 2 | 4 |
| 2017 | 1 | 4 |
| 2018 | 4 | 4 |
| 2019 | 6 | 6 |
| 2020 | 5 | 6 |
| 2021 | 5 | 4 |
| 2022 | 2 | 3 |
| 2023 | 4 | 9 |
| 2024 | 2 | 7 |
| 2025 | 3 | 3 |
| 2026 | 4 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Tap changer and a transformer arrangement comprising the tap changer29 Sep 2026US 12,749,618 B2Hitachi Energy Ltd
- On-load tap changer and tap-changing transformer having an on-load tap changer29 Sep 2026US 12,749,634 B2Maschinenfabrik Reinhausen GmbH
- On-load tap changer and tap-changing transformer having an on-load tap changer18 Aug 2026US 12,712,136 B2Maschinenfabrik Reinhausen GmbH
- Full range boosting device for accumulator of on-load tap changer, accumulator, and on-load tap changer21 Apr 2026US 12,609,240 B2Beijing Aerospace Control Device Institute
- Tap changer arrangement and a transformer arrangement comprising the tap changer arrangement11 Nov 2025US 12,469,636 B2Hitachi Energy Ltd
- Voltage amplitude and phase adjustment apparatus and method, and computer device and storage medium27 Aug 2026US 2026/0254344 A1
- Method for producing an electrical regulation winding, prefabricated conductor arrangement and electric regulation winding16 Jul 2026US 2026/0204475 A1Hitachi Energy Ltd
- Three-dimensional vertical inductors with magnetic core11 Jun 2026US 2026/0162861 A1Microchip Technology Incorporated
- Three-dimensional inductors with vertical winding11 Jun 2026US 2026/0162885 A1Microchip Technology Incorporated
- Three-dimensional differential inductor with vertical winding11 Jun 2026US 2026/0162886 A1Microchip Technology Incorporated
Most cited
By later US patents
- Efficient, low leakage inductance, multi-tap, RF transformer and method of making same38US 6,664,881 B1Ameritherm, Inc. · 2003
- Transformer apparatus with -superimposed insulated switch and transformer units30US 4,484,169 AMitsubishi Denki Kabushiki Kaisha · 1984
- Switched-capacitor converter with multi-tapped autotransformer25US 10,804,798 B1Infineon Technologies Austria AG · 2020
- Transformer with tapped subwindings19US 4,255,734 A1981
- Thyristor tap changer12US 6,856,122 B2Maschinenfabrik Reinhausen GmbH · 2005