Latent Heat Storage at High Temperature: Patents Behind the Race to Store Heat
16.2% concentration at the top. The five leading assignees hold 557 of 3,441 records in scope — a real lead, but not a lock on the field. Filings rose to a peak of 171 in 2021, then eased to 115 by 2024 — a 33% pullback over that complete span. 2025 and 2026 figures are still filling in under the roughly 18-month publication lag, so the most recent two years should not be read as a further decline.
- 1PANASONIC HOLDINGS CORP8.3%
- 2THE DOW CHEM CO2.5%
- 3TEMPRA TECH INC2.2%
- 4NOK CORP1.7%
- 5KK TOSHIBA1.5%
See the full latent heat storage at high temperature analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions
Who are the leading patent holders in latent heat storage at high temperature?
The ranked leader holds 286 records, well ahead of fifth place at 53 and tenth place at 37, so there is a clear top filer but no single company dominates the field. The top five assignees combine for 16.2% of the 3,441 records in scope, and the top ten for 22.4%, which leaves most of the filing activity spread across a long tail of smaller entrants. Several of the largest historical filers show zero filings in the latest year of this dataset, so current leadership should be checked against recent activity rather than assumed from cumulative record count alone.
Is patent filing in this space growing or slowing down?
Filings peaked at 171 in 2021 and had fallen to 115 by 2024, a 33% pullback over that complete three-year span. Publication lags filing by roughly 18 months, so 2025 and 2026 counts in this dataset are still incomplete and understate real activity; they should not be read as confirming a further decline. The honest description is a cooling from an unusually active 2021 rather than a technology in retreat.
What technology areas do these patents actually cover?
Just over half of the 3,441 records, 50.6%, touch C09K, the IPC class for materials used in miscellaneous applications, which covers the phase change material compositions themselves. F28D, heat-exchange apparatus, appears on 29.0% of records, with smaller shares in refrigeration, domestic heating, catalysis-related processes and even implant applications. Because a single record can carry several IPC classes, these shares add up to more than 100%, reflecting how often a filing bundles a material composition claim with a containment or heat-exchanger claim.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Latent Heat Storage at High Temperature covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.