H01H 47/04
For holding armature in attracted position
Official title: for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current {(with switching regulator H01H47/325)}
H01H47/04 (For holding armature in attracted position) appears on 209 US grants and 143 published applications in this corpus.
Search patents in H01H- Granted patents
- 209
- Published applications
- 143
- Assignees
- 131
- Inventors
- 402
- Latest grant
- 27 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 5 | 0 |
| 1987 | 5 | 0 |
| 1988 | 3 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 5 | 0 |
| 1992 | 6 | 0 |
| 1993 | 2 | 0 |
| 1994 | 9 | 0 |
| 1995 | 6 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 4 | 0 |
| 2001 | 5 | 1 |
| 2002 | 2 | 2 |
| 2003 | 3 | 1 |
| 2004 | 5 | 4 |
| 2005 | 5 | 5 |
| 2006 | 2 | 2 |
| 2007 | 2 | 6 |
| 2008 | 3 | 4 |
| 2009 | 3 | 5 |
| 2010 | 3 | 5 |
| 2011 | 3 | 5 |
| 2012 | 5 | 6 |
| 2013 | 6 | 7 |
| 2014 | 4 | 8 |
| 2015 | 8 | 12 |
| 2016 | 5 | 9 |
| 2017 | 8 | 5 |
| 2018 | 8 | 10 |
| 2019 | 9 | 5 |
| 2020 | 6 | 7 |
| 2021 | 11 | 6 |
| 2022 | 9 | 9 |
| 2023 | 6 | 6 |
| 2024 | 2 | 5 |
| 2025 | 5 | 3 |
| 2026 | 1 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01H 47/043Making use of an energy accumulator50
- H01H 47/10By switching-in or -out impedance external to the relay winding35
- H01H 47/08By changing number of parallel-connected turns or windings17
- H01H 2047/046With measuring of the magnetic fieldIndexing code16
- H01H 47/06By changing number of serially-connected turns or windings15
Recent patents
- Relay driving apparatus for controlling operation of multiple switches27 Jan 2026US 12,537,154 B2Hanwha Solutions Corporation
- Electromagnetic relay with decreasing hold power requirement23 Dec 2025US 12,505,967 B2OMRON Corporation
- Relay assembly and electric vehicle comprising same25 Nov 2025US 12,479,304 B2LG Energy Solution, Ltd.
- Method and apparatus for handling contactor / relay contact bounce under transient conditions12 Aug 2025US 12,387,894 B2Astronics Advanced Electronic Systems Corp.
- Electromechanical switching device for an electric power circuit comprising at least one system for detecting the contact or non-contact position of a blade of a contactor5 Aug 2025US 12,381,056 B2Airbus Operations GmbH
- Switching device27 Aug 2026US 2026/0253825 A1Ellenberger & Poensgen GmbH
- Relay28 May 2026US 2026/0148920 A1Xiamen Hongfa Electric Power Controls Co., Ltd.
- Economizing electromechanical contactors21 May 2026US 2026/0142108 A1Sensata Technologies, Inc.
- Relay5 Feb 2026US 2026/0038757 A1Xiamen Hongfa Electric Power Controls Co., Ltd.
- Relay Control Apparatus, Battery Pack and Electric Vehicle8 Jan 2026US 2026/0008348 A1LG Energy Solution, Ltd.
Most cited
By later US patents
- Solenoid actuator having a magnetic flux sensor87US 5,032,812 AAutomatic Switch Company · 1991
- Remote control circuit breaker system71US 5,373,411 AEaton Corporation · 1994
- Electromagnetic switching apparatus68US 6,911,884 B2Matsushita Electric Works, Ltd. · 2005
- Solenoid activation circuitry using high voltage65US 4,777,556 ADataTrak, Inc. · 1988
- Solenoid closure detection63US 5,053,911 AMotorola, Inc. · 1991