Heat Exchanger Patents: Top Companies & Filing Trends 2026
Heat exchanger patents: who leads filing, how concentrated the field is, and where claim space is still open
9.0% of the field. The five most active filers together account for 27,751 of 308,784 records in scope — a real lead, but not a lockout. Annual filings climbed to a peak of 1,045 in 2022, then eased to 882 by 2024 — a 15% pullback from the 2021 figure of 1,037 over that three-year span. Figures for 2025 and 2026 are still incomplete because publication lags filing by roughly 18 months; they should not be read as a further decline yet.
- 1DAIKIN INDUSTRIES LTD2.7%
- 2MITSUBISHI ELECTRIC CORP2.6%
- 3LG ELECTRONICS INC1.5%
- 4PANASONIC HOLDINGS CORP1.1%
- 5CARRIER CORP1.1%
See the full heat exchangers patent landscape 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 about the heat exchanger patent landscape
Who holds the most heat exchanger patents?
The assignee ranking in this dataset covers 100 companies drawn from consumer HVAC, automotive, industrial refrigeration and power-generation sectors. The leading assignee holds 8,286 records, well ahead of the fifth-place holder at 3,248 and the tenth-place holder at 2,168, indicating a clear leader rather than a tightly bunched group at the top. Even so, the top 10 combined account for only 13.3% of all 308,784 records in scope, so the majority of filing activity sits outside the leadership tier.
Is the heat exchanger patent field growing or shrinking?
Filings peaked at 1,045 in 2022 and eased to 882 by 2024, a 15% decline from the 2021 figure of 1,037 over that three-year span. That is a genuine cooling trend measured on complete years. Figures for 2025 and 2026 are still incomplete because publication typically lags filing by around 18 months, so the field should not yet be described as declining based on the most recent partial years.
Which heat exchanger sub-technologies have the most patent activity?
F25B, covering refrigeration and heat pumps, and F28D, covering heat-exchange apparatus, are the two most heavily claimed IPC subclasses in this corpus, each above 1% of the 308,784 records in scope. Steam and thermal power plant claims (F01K) and heat-exchanger detail claims (F28F) follow closely behind. Because a single filing can carry multiple IPC codes, these subclass shares overlap rather than summing to a whole.
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 Heat Exchangers Patent Landscape covering 2015–2026, data cut-off 2026-08-31. 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.