H01F 41/0293
Diffusion of rare earth elements
Official title: {diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets}
H01F41/0293 (Diffusion of rare earth elements) appears on 383 US grants and 584 published applications in this corpus.
Search patents in H01F- Granted patents
- 383
- Published applications
- 584
- Assignees
- 129
- Inventors
- 799
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 2003 | 0 | 1 |
| 2004 | 2 | 4 |
| 2005 | 0 | 4 |
| 2006 | 3 | 8 |
| 2007 | 3 | 14 |
| 2008 | 3 | 13 |
| 2009 | 8 | 10 |
| 2010 | 6 | 25 |
| 2011 | 16 | 28 |
| 2012 | 24 | 30 |
| 2013 | 14 | 27 |
| 2014 | 10 | 26 |
| 2015 | 9 | 31 |
| 2016 | 24 | 23 |
| 2017 | 17 | 39 |
| 2018 | 20 | 41 |
| 2019 | 37 | 34 |
| 2020 | 33 | 33 |
| 2021 | 22 | 34 |
| 2022 | 31 | 43 |
| 2023 | 28 | 31 |
| 2024 | 23 | 38 |
| 2025 | 21 | 26 |
| 2026 | 19 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- R-T-B based permanent magnet and method for manufacturing same29 Sep 2026US 12,749,603 B2TDK Corporation
- Permeating treatment method for radially oriented sintered magnet, magnet, and composition for magnet permeation29 Sep 2026US 12,749,620 B2China Rare Earth Radimag (Shenzhen) Technology Co., Ltd.
- Anisotropic rare-earth sintered magnet and method for producing same8 Sep 2026US 12,731,709 B2Shin-Etsu Chemical Co., Ltd.
- Method for preparing Nd—Fe—B-diffused permanent magnets based on pressure gradients30 Jun 2026US 12,671,029 B1China Jiliang University
- Coating materials for diffusing into magnet of NdFeB and a method of making it16 Jun 2026US 12,658,361 B2Ningbo Jinji Strong Magnetic Material Co., Ltd.
- Near net shape fabrication of anisotropic magnet using hot roll method13 Aug 2026US 2026/0233306 A1Iowa State University Research Foundation, Inc.
- Rare earth sintered magnet, method for producing rare earth sintered magnet, rotor, and rotary machine30 Jul 2026US 2026/0221322 A1Mitsubishi Electric Corporation
- Manufacturing method of re-fe-b based sintered magnet and re-fe-b based sintered magnet manufactured through the method9 Jul 2026US 2026/0196406 A1Daegu Gyeongbuk Institute of Science and Technology
- Bonded magnet, on-vehicle main motor and oil pump comprising bonded magnet, curable composition for bonded magnet, and method for producing bonded magnet11 Jun 2026US 2026/0162859 A1Nichia Corporation
- Sintered neodymium-iron-boron magnet with high corrosion resistance and high magnetic performance, and preparation method therefor4 Jun 2026US 2026/0155283 A1Nantong Zhenghai Magnet Co., Ltd.
Most cited
By later US patents
- R-T-B sintered permanent magnet40US 6,468,365 B1Hitachi Metals, Ltd. · 2002
- Rare earth-based permanent magnet39US 5,034,146 AShin-Etsu Chemical Co., Ltd. · 1991
- Rare earth permanent magnet, making method, and permanent magnet rotary machine24US 7,559,996 B2Shin-Etsu Chemical Co., Ltd. · 2009
- Rare earth bonded magnet and rare earth-iron-boron type magnet alloy17US 5,872,501 AToda Kogyo Corporation · 1999
- Rare earth-iron system permanent magnet and process for producing the same14US 5,213,631 ASeiko Epson Corporation · 1993