H01F 7/1838
By switching-in or -out impedance
Official title: {by switching-in or -out impedance (for relays H01H47/10)}
H01F7/1838 (By switching-in or -out impedance) appears on 13 US grants and 12 published applications in this corpus.
Search patents in H01F- Granted patents
- 13
- Published applications
- 12
- Assignees
- 11
- Inventors
- 29
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 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 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 3 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 1 | 1 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 0 | 0 |
| 2021 | 1 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 1 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Solenoid assembly with included constant-current controller circuit3 Mar 2026US 12,567,526 B2Hanchett Entry Systems, Inc.
- Solenoid assembly with included constant-current controller circuit3 Jan 2023US 11,545,289 B2Hanchett Entry Systems, Inc.
- Solenoid assembly with included constant-current controller circuit30 Mar 2021US 10,964,467 B2Hanchett Entry Systems, Inc.
- Assuring dropout of solenoid valve controlled by peak-and-hold driver21 May 2019US 10,295,077 B2Automatic Switch Company
- Control device for a switching device with separate start-up and holding coils4 Jul 2017US 9,698,669 B2Eaton Electrical IP GmbH & Co. KG
- Circuit and method for driving an inductive load with reduced power loss13 Aug 2026US 2026/0237548 A1
- Solenoid assembly with included constant-current controller circuit27 Apr 2023US 2023/0126500 A1Hanchett Entry Systems, Inc.
- Solenoid assembly with included constant-current controller circuit11 Feb 2021US 2021/0043351 A1Hanchett Entry Systems, Inc.
- Solenoid assembly with included constant-current controller circuit29 Aug 2019US 2019/0267173 A1Hanchett Entry Systems, Inc.
- Circuit for temperature compensation5 Apr 2018US 2018/0094591 A1Eagle Actuator Components GmbH & Co. KG
Most cited
By later US patents
- Magnetic valve with electronic control17US 4,291,358 ABurkert S.A.S. · 1981
- Solenoid control system with cusp detector14US 3,946,285 ABurroughs Corporation · 1976
- Method and device for determining a PWM signal on which a dither frequency is superimposed in order to control a solenoid valve7US 7,853,360 B2Continental Automotive GmbH · 2010
- Electromagnet and method of producing the same5US 4,502,031 AMitsubishi Denki Kabushiki Kaisha · 1985
- DC solenoid actuator circuits4US 4,642,725 AVent-Axia Limited · 1987