H01F 7/0226
Pm with variable field strength
Official title: {PM with variable field strength (H01F7/0284 takes precedence)}
H01F7/0226 (Pm with variable field strength) appears on 86 US grants and 94 published applications in this corpus.
Search patents in H01F- Granted patents
- 86
- Published applications
- 94
- Assignees
- 72
- Inventors
- 175
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 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 | 2 |
| 2003 | 0 | 0 |
| 2004 | 1 | 3 |
| 2005 | 1 | 1 |
| 2006 | 3 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 2 |
| 2011 | 0 | 3 |
| 2012 | 2 | 1 |
| 2013 | 3 | 3 |
| 2014 | 1 | 1 |
| 2015 | 2 | 6 |
| 2016 | 3 | 1 |
| 2017 | 5 | 6 |
| 2018 | 5 | 9 |
| 2019 | 3 | 7 |
| 2020 | 8 | 7 |
| 2021 | 8 | 10 |
| 2022 | 6 | 7 |
| 2023 | 6 | 7 |
| 2024 | 6 | 7 |
| 2025 | 10 | 6 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Magnetic systems incorporating electropermanent magnet arrays18 Aug 2026US 12,712,104 B2Apple Inc.
- Variable field magnetic couplers and methods for engaging a ferromagnetic workpiece17 Mar 2026US 12,580,142 B2Magswitch Automation Company
- Mechanical gradient magnetic field generator27 Jan 2026US 12,535,545 B2Koninklijke Philips N. V.
- Electromechanical lock and method9 Dec 2025US 12,492,577 B2iLOQ Oy
- Magnetic attraction fixing device with adjustable magnetic attraction distance18 Nov 2025US 12,476,031 B2Shenzhen Huayi Fangyuan Technology Co., Ltd
- Variable field magnetic couplers and methods for engaging a ferromagnetic workpiece27 Aug 2026US 2026/0253824 A1Magswitch Automation Company
- Magnetic projection and capture25 Jun 2026US 2026/0177362 A1LAU Superconductors Inc.
- Electromagnetic actuator system26 Mar 2026US 2026/0088204 A1Apple Inc.
- Variable field magnetic couplers and methods for engaging a ferromagnetic workpiece9 Oct 2025US 2025/0316429 A1Magswitch Automation Company
- Magnetic Attraction Fixing Device with Adjustable Magnetic Attraction Distance25 Sep 2025US 2025/0299860 A1Shenzhen Huayi Fangyuan Technology Co., Ltd
Most cited
By later US patents
- Switchable permanent magnetic device78US 6,707,360 B2The Aussie Kids Toy Company Pty Ltd. · 2004
- Variable field magnet apparatus78US 6,864,773 B2APPLIED Materials.Inc. · 2005
- Switchable permanent magnetic device72US 7,012,495 B2The Aussie Kids Toy Company Pty Ltd. · 2006
- Magnetic throttling and control: magnetic control61US 9,627,120 B2Board of Regents, The University of Texas System · 2017
- Rotary switchable multi-core element permanent magnet-based apparatus59US 8,350,663 B1Creative Engineering Solutions, Inc. · 2013