Technology page · data to 2026-10-15
L10 FeNi (tetrataenite) magnet patents
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Tetrataenite, the ordered L10 phase of iron-nickel, occurs in meteorites and is hard to make on industrial timescales. Filings cover routes to form the ordered phase and to process it into magnets.
In our base
- 14 patent families (29 publications) published from 2021-11-19 to 2026-10-15.
- 2 new families in the last twelve months, against 3 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 | 1 |
| 2022 | 4 |
| 2023 | 2 |
| 2024 | 5 |
| 2026 (to 10-15) | 2 |
Offices
A family counts once in each office where a member has published.
| Office | Families |
|---|---|
| US | 10 |
| CN | 6 |
| WO | 6 |
| EP | 1 |
| JP | 1 |
Applicants with two or more families
Harmonised names from the source record; subsidiaries are not merged.
| Applicant | Families |
|---|---|
| Denso Corp | 12 |
| Nichia Corp | 4 |
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.
FeNi nitride
JP-2026126340-A · published 2026-08-04 · applicant not recorded · offices: CN, JP, US
Direct synthesis of L10 FeNi and other metal alloys from metal-cyano/ nitrosyl complexes
US-20260201506-A1 · published 2026-07-16 · Consiglio Nazionale Ricerche [IT] · offices: EP, US, WO
Magnetic body and magnet
WO-2026088551-A1 · published 2026-04-30 · Denso Corp; Nichia Corp · offices: WO
WO-2026088551-A1 (Denso with Nichia) claims a magnetic body of flattened L10-ordered FeNi alloy particles, with the easy axis along the flat face and an insulating coating at least 0.5 nm thick. The flake shape allows the easy axis to be aligned mechanically, and the coating addresses eddy-current loss in a finished magnet. Denso is the main industrial applicant for L10 FeNi in our data; with its alloyed-FeNi application, this shows the work moving from synthesis toward usable magnet form.
FeNi ordered alloy structural body and method for manufacturing the same
US-12614653-B2 · published 2026-04-28 · Denso Corp · offices: US, WO
L10Ordered-FeNi alloy and its prepn process
CN-117483782-B · published 2026-03-17 · Univ Zhejiang Technology · offices: CN
L10 type feni ordered alloy, permanent magnet, and method for producing l10 type feni ordered alloy
WO-2026009965-A1 · published 2026-01-08 · Denso Corp · offices: WO
WO-2026009965-A1 (Denso) claims an L10-type FeNi ordered alloy containing a group 6 or group 7 transition metal, which increases coercive force, and a method of producing it. Low coercivity is the main weakness of synthetic L10 FeNi, so alloying to raise it goes to the core problem. Denso has a second L10 FeNi application on flattened, coated particles; watch for property figures in national-phase filings.
Magnetic body, magnet, and method for manufacturing magnetic body
US-20260004959-A1 · published 2026-01-01 · Denso Corp; Nichia Corp · offices: CN, US, WO
L10Method for manufacturing FeNi ordered alloy
CN-121240943-A · published 2025-12-30 · Nichia Corp; Denso Corp · offices: CN, WO
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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.