H01F 13/006
Methods and devices for demagnetising of magnetic bodies
Official title: {Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material (for erasing of information on magnetic record carriers G11B5/00)}
H01F13/006 (Methods and devices for demagnetising of magnetic bodies) appears on 156 US grants and 125 published applications in this corpus.
Search patents in H01F- Granted patents
- 156
- Published applications
- 125
- Assignees
- 120
- Inventors
- 368
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 0 | 0 |
| 1986 | 5 | 0 |
| 1987 | 3 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 3 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 3 | 1 |
| 2004 | 3 | 5 |
| 2005 | 3 | 5 |
| 2006 | 8 | 8 |
| 2007 | 5 | 2 |
| 2008 | 1 | 6 |
| 2009 | 1 | 3 |
| 2010 | 2 | 4 |
| 2011 | 4 | 4 |
| 2012 | 3 | 2 |
| 2013 | 3 | 4 |
| 2014 | 2 | 9 |
| 2015 | 11 | 13 |
| 2016 | 7 | 1 |
| 2017 | 5 | 6 |
| 2018 | 0 | 5 |
| 2019 | 3 | 4 |
| 2020 | 8 | 10 |
| 2021 | 3 | 5 |
| 2022 | 9 | 9 |
| 2023 | 6 | 3 |
| 2024 | 3 | 4 |
| 2025 | 4 | 6 |
| 2026 | 3 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Solid-state degauss circuit for use in an electromagnetic lock23 Jun 2026US 12,665,116 B2Hanchett Entry Systems, Inc.
- Magnetisation and demagnetisation of a component21 Apr 2026US 12,609,566 B2ROLLS-ROYCE plc
- Protection apparatus and brushless motor system17 Feb 2026US 12,556,124 B2Huawei Technologies Co., Ltd.
- Systems and methods for demagnetization of a permanent magnet rotor5 Aug 2025US 12,381,026 B2Ford Global Technologies, LLC
- Transformer DC magnetization detection and mitigation through vibration measurement10 Jun 2025US 12,327,675 B2Hitachi Energy Ltd
- Permanent magnet motor demagnetization testing station10 Sep 2026US 2026/0266932 A1GM Global Technology Operations LLC
- Demagnetization of working-channel tools in an electromagnetically tracked endoscope30 Jul 2026US 2026/0221326 A1Magnisity Ltd.
- Manufacturing method for magnetic molded body and manufacturing method for anisotropic bond magnet23 Jul 2026US 2026/0208264 A1
- Injection molding machine intended for the manufacture of injected permanent magnet and method of manufacturing an injected permanent magnet25 Jun 2026US 2026/0179813 A1Novares France
- Permanent magnet demagnetization method, device, and magnet21 May 2026US 2026/0142065 A1Beijing Zhong Ke San Huan Hi-Tech Co., Ltd.
Most cited
By later US patents
- Method and apparatus for magnetizing and demagnetizing current transformers and magnetic bodies79US 6,160,697 A2000
- Method and apparatus for controlling the magnetization of current transformers and other magnetic bodies45US 6,522,517 B12003
- High energy degausser34US 4,621,299 AGeneral Kinetics, Incorporated · 1986
- Process for demagnetizing components by alternating magnetic fields of varying intensity33US 4,384,313 A1983
- Torque sensor32US 7,243,557 B2NCTEngineering GmbH · 2007