Technology page · data to 2026-10-15
Advanced ferrite permanent magnet patents
If your team works on this technology, the risk is building next to a competitor's claim you have not read yet, often published only in Chinese, Japanese or Korean.
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Hexagonal strontium and barium ferrites are the main rare-earth-free magnets in volume production. Filings cover La–Co substitution, sintering and powder routes, bonded ferrites and ferrite magnet shapes for motors.
In our base
- 1164 patent families (1487 publications) published from 2021-09-27 to 2026-10-15.
- 141 new families in the last twelve months, against 171 in the twelve months before.
New families by year of first publication
* 2021 counts publications from 09-27, when our base starts.
* 2026 counts publications up to 10-15 only; new publications reach our sources weeks late, Chinese ones three weeks or more.
| Year | Families |
|---|---|
| 2021 | 88 |
| 2022 | 327 |
| 2023 | 241 |
| 2024 | 237 |
| 2025 | 158 |
| 2026 (to 10-15) | 113 |
Offices
A family counts once in each office where a member has published.
| Office | Families |
|---|---|
| CN | 1051 |
| US | 57 |
| JP | 37 |
| WO | 35 |
| KR | 30 |
| EP | 17 |
| TW | 16 |
| GB | 5 |
| AU | 1 |
| CA | 1 |
| DE | 1 |
| ES | 1 |
| MA | 1 |
| MY | 1 |
| PL | 1 |
| RU | 1 |
Applicants with two or more families
Harmonised names from the source record; subsidiaries are not merged.
| Applicant | Families |
|---|---|
| Hengdian Group DMEGC Magnetics Co Ltd | 52 |
| Anhui Jinzhai Jiangjun Magnetic Ind Co Ltd | 36 |
| TDK Corp | 28 |
| Anhui Sinomag Tech Co Ltd | 27 |
| Bgrimm Magnetic Fuyang Co Ltd | 26 |
| Chongqing Lingda Magnets Tech Co Ltd | 25 |
| Hunan Aerospace Magnet & Magneto Co Ltd | 21 |
| Jinhua Cimeng Intellectual Property Services Co Ltd | 21 |
| Sinosteel New Materials Co Ltd | 21 |
| Magnet Business Shenzhen Co Ltd | 18 |
Most recent publications
The newest publication in each of the 8 most recently active families, as recorded. Families our analysts have reviewed carry a note.
Ferrite sintered magnet
WO-2026196739-A1 · published 2026-09-24 · Proterial Ltd [JP] · offices: WO
Proterial claims a sintered strontium ferrite magnet with the hexagonal crystal structure used in all hard ferrites. It adds 0.1-1.2 mass% MnO and 0.1-2.8 mass% of a rare-earth oxide that must include lanthanum. It also adds 0.06-0.7 mass% of zinc and/or nickel oxide. Lanthanum substitution is the standard route to higher-grade ferrites. The claimed additives do not include cobalt, the costly additive in today's top grades; the full text will show whether cobalt is excluded. The record gives no remanence or coercivity values, the two figures that rank a magnet grade.
Hexagonal ferrite magnetic powder for bonded magnets and its manufacturing method, and bonded magnets and their manufacturing method.
JP-7915584-B2 · published 2026-09-04 · Dowa Electronics Materials Co Ltd · offices: JP
DOWA Electronics Materials holds a Japanese grant on hexagonal ferrite powder for bonded magnets. The earlier application claims lanthanum-substituted strontium ferrite with small cobalt and zinc additions and a coercivity of at least 2000 oersted (Oe). The aim is higher remanence in bonded magnets; the grant's claims are not yet in our record. Bonded ferrite serves small motors and sensors.
Dual-purpose wiring type ferrite rotor blower
CN-122670485-A · published 2026-09-01 · applicant not recorded · offices: CN
Preparation method of Sc-substituted M-type Ba ferrite single crystal material
CN-122649092-A · published 2026-08-28 · applicant not recorded · offices: CN
Novel high-stability preparation process of doped ferrite magnetic steel
CN-122658869-A · published 2026-08-28 · Dongtai Dongbao Electromagnetic Material Tech Co Ltd · offices: CN
A Chinese application claims a route for doped ferrite magnets: additives at a second ball-milling after pre-sintering, pulsed-field pressing, graded sintering and ageing. The goal is stable magnetic properties under hot-cold cycling and long service; no values are given.
Preparation method of high magnetic energy product rare earth doped permanent magnetic ferrite
CN-122627786-A · published 2026-08-25 · Shenzhen Xinyi Magnetic Mat Co Ltd · offices: CN
CN-122627786-A claims a ferrite doped with gadolinium and lanthanum, microwave-sintered in four stages. The abstract reports remanence (the field a magnet keeps) of 472 mT and coercivity (resistance to demagnetisation) of 321 kA/m. Filer's own figures; target use is electric-vehicle motors.
Double-layer composite permanent magnetic ferrite magnetic shoe and preparation method thereof
CN-122638291-A · published 2026-08-25 · Hunan Aerospace Magnet & Magneto Co Ltd · offices: CN
A Chinese application claims an arc-shaped strontium ferrite tile sintered in one piece from two layers: a high-performance working face and a low-cost mounting face. The filer says the layers, pressed together in an orientation field, do not separate or crack. It cuts material cost; no magnetic values are given.
Multipolar tangential magnetization integral rotor punching structure and ferrite permanent magnet synchronous motor
CN-122639543-A · published 2026-08-25 · Shandong Univ · offices: CN
A Chinese application claims a rotor lamination for a ferrite motor with tangentially magnetised (spoke) magnets. Flux-isolation slots sit inside each magnet slot, with bridges between them. The filer claims near rare-earth power and torque density at much lower cost, without figures. Spoke rotors are the usual route to competitive ferrite motors.
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Other technologies
Iron nitride (Fe16N2) · Mn–Bi · Mn–Al–C · L10 FeNi / tetrataenite · RE-free motor topologies · August 2026 landscape
Publications come from the EPO Open Patent Services and Google Patents Public Data, matched against a published CPC and keyword scope and grouped by DOCDB patent family. New publications reach our sources several weeks after they are published (Chinese ones three weeks or more), so the latest weeks are incomplete.