H01H 9/0005
Tap change devices
Official title: {Tap change devices}
H01H9/0005 (Tap change devices) appears on 374 US grants and 326 published applications in this corpus.
Search patents in H01H- Granted patents
- 374
- Published applications
- 326
- Assignees
- 116
- Inventors
- 612
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 6 | 0 |
| 1985 | 7 | 0 |
| 1986 | 3 | 0 |
| 1987 | 4 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 7 | 0 |
| 1991 | 4 | 0 |
| 1992 | 6 | 0 |
| 1993 | 5 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 7 | 0 |
| 1998 | 7 | 0 |
| 1999 | 3 | 0 |
| 2000 | 9 | 0 |
| 2001 | 5 | 1 |
| 2002 | 5 | 2 |
| 2003 | 2 | 1 |
| 2004 | 4 | 6 |
| 2005 | 6 | 6 |
| 2006 | 4 | 4 |
| 2007 | 0 | 3 |
| 2008 | 5 | 13 |
| 2009 | 7 | 12 |
| 2010 | 9 | 8 |
| 2011 | 10 | 7 |
| 2012 | 9 | 16 |
| 2013 | 6 | 15 |
| 2014 | 12 | 26 |
| 2015 | 24 | 32 |
| 2016 | 19 | 26 |
| 2017 | 23 | 18 |
| 2018 | 19 | 14 |
| 2019 | 18 | 9 |
| 2020 | 17 | 8 |
| 2021 | 9 | 8 |
| 2022 | 5 | 27 |
| 2023 | 10 | 24 |
| 2024 | 27 | 18 |
| 2025 | 19 | 14 |
| 2026 | 5 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01H 9/0027Operating mechanisms138
- H01H 9/0016Contact arrangements for tap changers98
- H01H 9/0038Making use of vacuum switches79
- H01H 2009/0061Monitoring tap change switching devicesIndexing code75
- H01H 9/0044Casings58
- H01H 9/0011Voltage selector switches29
- H01H 2009/0055Oil filters for tap change devicesIndexing code11
Recent patents
- 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
- Electrical switch for an on-load tap changer5 May 2026US 12,620,535 B2Hitachi Energy Ltd
- 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
- Switch assembly comprising an on-load tap changer and a drive system14 Apr 2026US 12,603,235 B2Maschinenfabrik Reinhausen GmbH
- Switch pole for electrical systems8 Oct 2026US 2026/0311938 A1
- On-load tap changer cover and on-load tap changer device17 Sep 2026US 2026/0279695 A1Maschinenfabrik Reinhausen GmbH
- Variable shunt phaser with pressure relief mechanism23 Jul 2026US 2026/0213623 A1GM Global Technology Operations LLC
- On-load tap changer and method for operating an on-load tap changer30 Apr 2026US 2026/0120969 A1Hitachi Energy Ltd
- On-load tap-changer, method for actuating an on-load tap-changer, and tap-changing transformer having an on-load tap-changer23 Apr 2026US 2026/0112539 A1Maschinenfabrik Reinhausen GmbH
Most cited
By later US patents
- Method for determining wear and other characteristics of electrodes in high voltage equipment118US 6,448,758 B1General Electric Company · 2002
- Apparatus for continually upgrading transformer dielectric liquid46US 4,437,082 AWestinghouse Electric Corp. · 1984
- Combined solid-state and mechanically-switched transformer tap-changer45US 5,408,171 AElectric Power Research Institute, Inc. · 1995
- Apparatus for protecting vacuum interrupter type on-line tap changer39US 4,388,664 AFuji Electric Co., Ltd. · 1983
- Control apparatus for switching a battery pack39US 4,957,831 ABlack & Decker Inc. · 1990