Magnetocaloric Cooling Environmental Durability Patent Landscape 2026
- A flat filing curve, not a rising one. Filings peaked in 2020 at 4 and the 2022 midpoint sits at just 1, so durability-specific claims are not accelerating the way core magnetocaloric filing has.
- Corrosion-and-oxidation claim space is thin. C23F (corrosion & metal removal) and C25D (electroplating) each carry only 3 records against 18 in H01F, meaning most protection work still rides inside alloy and device claims rather than standing on its own.
- Filing is split three ways with no single gatekeeper. China and the United States each hold 7 of the tracked filings, with Europe and India at 3 apiece — a jurisdictional spread that leaves room for a first mover in any one office.
Top-5 share is the combined record count of the five largest assignees divided by all 25 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape isolates patent families that combine a magnetocaloric cooling term with an explicit durability claim — corrosion resistance, oxidation resistance, cyclic stability or long-term durability — inside the IPC classes covering refrigeration hardware, alloy composition and corrosion chemistry. It is a narrow cut of a broader field: the core magnetocaloric alloy and device art is far larger, and this set only surfaces the subset of that art where inventors bothered to claim environmental robustness directly rather than leaving it as an implicit property of the alloy.
Twenty-five families is a small enough set that individual assignees and single documents move the picture. Read the filing trend as directional rather than statistical, and treat the most recent year as an undercount — publication typically lags filing by around 18 months, so 2025 and 2026 filings are still arriving.
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Filing trend and technology composition
Two views of the same 25-family set: how filing has moved year over year, and which IPC subclasses carry the durability claims.
Filing trend, 2017–2026
Filings run from 2 in 2017 to a peak of 4 in 2020, drop to 1 at the 2022 midpoint, and sit at 1 in the partial 2026 year — a flat-to-declining pattern rather than the compounding growth seen in adjacent thermal-management fields.
IPC subclass distribution
H01F (18) and C22C (15) dominate, confirming that durability is claimed mostly as a property of the magnetic alloy itself; F25B (14) covers the device and system side, while corrosion-specific chemistry (C23F, C25D) and surface/heat treatment (C21D) each stay in single digits — the narrowest, least contested corners of the set.
Shares are the percentage of the 25 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Magnetocaloric Cooling Environmental Durability with Eureka
This page is one run against one query. Ask Eureka your own question about magnetocaloric cooling environmental durability and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records in this set
Sheath-integrated magnetic refrigeration member, production method for the member and magnetic refrigeration system
The invention describes a linear or thin band-like member pairing a non-ferromagnetic sheath around a magnetocaloric core, aimed at preventing degradation of the magnetic refrigeration material over time without reducing magnetocaloric effect or thermal conductivity — a structural rather than compositional route to durability.Filed by Shin-Etsu Chemical; published 2020-12-24.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20070220901A1 | Magnetic refrigeration material and magnetic refrigeration device | 110 |
| 2 | US7063754B2 | Magnetic material for magnetic refrigeration and method for producing thereof | 78 |
| 3 | US20040194855A1 | Magnetic material for magnetic refrigeration and method for producing thereof | 60 |
| 4 | US20080078476A1 | Alloy and method for producing magnetic refrigeration material particles using same | 36 |
| 5 | CN101514458A | 一种La－Fe－Si系室温磁制冷材料在水性换热介质中的缓蚀剂 | 17 |
| 6 | JP2011162811A | Rare earth-iron based alloy powder for magnetic refrigeration | 13 |
| 7 | CN103060692A | 一种高耐蚀性稀土-铁铬硅碳磁热材料及其制备方法 | 11 |
| 8 | CN110504076A | 一种高耐蚀性稀土磁制冷材料以及在制冷机中的使用方法 | 6 |
| 9 | US20200400352A1 | Sheath-integrated magnetic refrigeration member, production method for the member and magnetic refrigeration … | 4 |
| 10 | CN110504076B | 一种高耐蚀性稀土磁制冷材料以及在制冷机中的使用方法 | 3 |
Citation counts reward earlier filings by construction — the top of this table is the founding art of magnetocaloric material design, not necessarily what is being asserted today.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three readings of the same dataset, aimed at where to file, what to expect from citations, and how to treat the recent-year numbers.
Growth already flattened once
The set peaked at 4 families in 2020 and fell to 1 by the 2022 midpoint. A durability-specific claim strategy here is entering a space that has already cooled once rather than one still building momentum.
Durability is claimed as alloy, not as coating
With six times as many H01F records as C23F records, most protection strategies are embedded in the magnetic material composition itself rather than in a separate corrosion-chemistry or plating claim.
The most-cited art predates the durability framing
The highest-cited documents in this set are foundational magnetic-refrigeration-material patents from the 2000s-era filings; their citation counts reflect age and centrality to the field, not that they are the current commercial reference point for corrosion or cyclic-stability claims.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to magnetocaloric cooling environmental durability, with the prior art for and against each one.
Who is filing, and where the claim space is still open
Recent-year momentum is thin across the board — most tracked assignees show zero filings in the latest year, with Shin-Etsu the one exception at 1. That makes this a landscape of past contributors rather than an active multi-way race, and it leaves room for a new entrant to define the durability sub-claims outright.
Shin-Etsu is the only assignee still active
Shin-Etsu Chemical Co., Ltd. (Shin-Etsu Chemical) is the sole tracked assignee with a filing in the latest year, via a structural sheath-based approach to preventing material degradation over time.
No single office dominates
China and the United States each carry 7 filings, with Europe and India at 3 each and Australia and Japan at 1 apiece. That spread means clearance searches need to cover at least four offices, not one.
Established names have gone quiet
University of Science and Technology Beijing, Toshiba Corporation, Fujikura Ltd., Vacuumschmelze GmbH & Co. KG and Sumitomo Metal Mining Co., Ltd. all show zero filings in the latest tracked year, suggesting the durability angle was a past research push rather than an ongoing program for most of them.
| Assignee | Recent year | YoY |
|---|---|---|
| Shin-Etsu Chemical Co., Ltd. | 1 | — |
| University of Science and Technology Beijing | 0 | — |
| Toshiba Corporation | 0 | — |
| Fujikura Ltd. | 0 | — |
| Vacuumschmelze GmbH & Co. KG | 0 | — |
| Sumitomo Metal Mining Co., Ltd. | 0 | — |
| Université Henri Poincaré, Nancy 1 | 0 | — |
Where to take this analysis
The dataset points to a narrow, currently quiet claim space rather than a crowded one — the next step is deciding whether to file into the gaps or design around the alloy-level art that already exists.
Map the sheath and coating sub-claims in detail
Corrosion and plating IPC classes carry only 3 records each. Before filing, pull the full text of those families to see exactly how narrow or broad their protective-layer claims are.
Explore in Patsnap EurekaTrack whether Shin-Etsu's filing is a one-off or a restart
Shin-Etsu is the only assignee active in the latest year. A second filing from them within 12–18 months would signal a renewed program worth watching closely.
Explore in Patsnap EurekaFrequently asked questions
This tracked landscape contains 25 patent families that combine a magnetocaloric cooling or refrigeration term with an explicit durability claim, such as corrosion resistance, oxidation resistance, cyclic stability or long-term durability. This is a deliberately narrow cut of the much larger core magnetocaloric alloy and device art — it only captures filings where durability is claimed directly, not merely implied. Treat it as a subset landscape rather than a full picture of magnetocaloric IP.
The trend is flat to declining rather than growing. Filings peaked at 4 families in 2020, dropped to 1 by the 2022 midpoint, and remain at 1 in the partial 2026 year. Because publication typically lags filing by around 18 months, the most recent one to two years will always look thinner than they eventually turn out to be, but even accounting for that lag the growth curve here does not show the acceleration seen in some adjacent thermal-management fields.
H01F (magnets, inductors and transformers) and C22C (alloys) carry the bulk of the durability claims, with 18 and 15 records respectively, meaning most protection strategies are built into the magnetic alloy composition itself. F25B, covering refrigeration and heat pump hardware, adds another 14. The more specialised corrosion-and-coating classes — C23F for corrosion chemistry and C25D for electroplating — each hold only 3 records, marking them as the thinnest and least contested parts of the claim space.
Recent-year activity is thin across the tracked assignees. Shin-Etsu Chemical (Shin-Etsu Chemical Co., Ltd.) is the only one with a filing in the latest tracked year, via a sheath-based structural approach to preventing material degradation. Other tracked names — including University of Science and Technology Beijing, Toshiba Corporation, Fujikura Ltd., Vacuumschmelze GmbH & Co. KG and Sumitomo Metal Mining Co., Ltd. — show zero filings in the latest year, indicating this is currently a quiet field with no active multi-way race.
US20200400352A1, filed by Shin-Etsu Chemical, claims a sheath-integrated magnetic refrigeration member: a linear or thin band-like structure with a non-ferromagnetic sheath around a magnetocaloric core, designed to prevent degradation of the magnetic material over time without reducing magnetocaloric effect or thermal conductivity. It is a structural, cladding-based route to durability rather than a compositional alloy change or a surface-chemistry treatment. That leaves alloy-level corrosion resistance, chemical inhibitor approaches and electroplated coating routes as distinct design directions largely outside this claim's structural approach, though any freedom-to-operate conclusion should be checked against the specific claim language and family status.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.