Thermoelectric Waste Heat Recovery Patents: Leaders & Trends 2026
- Filing has cooled from its 2022 peak. 282 records in 2022 fell to 156 by 2024, a 41% drop across that three-year span, though 2025-2026 figures are still filling in under the usual publication lag.
- No single assignee dominates. The leader holds 119 records and the top 5 combined account for just 10.4% of all 4,850 records in scope — this field has a long tail, not a gatekeeper.
- Semiconductor-device classes carry the bulk of the claim activity. H01L and H10N together touch over half the records, while adjacent classes like F25B and H02J sit under 5% each — a sign of where claim space is still thin.
Filing growth compares 2021 (266 records) with 2024 (156) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 4,850 records in scope (CR5), not by the ranked leaders only.
What the dataset covers
This landscape covers 4,850 published records filed or published between 2015 and mid-2026, drawn from a search combining thermoelectric generator, module and figure-of-merit terminology with contact resistance, thermal cycling, heat exchanger coupling, segmented leg design, power density and material toxicity language. That combination captures both the core thermoelectric device art and the packaging and reliability engineering that determines whether a device survives outside a lab.
Filing offices skew heavily toward the United States, with the EPO and WIPO's PCT route also carrying substantial volume — a pattern consistent with a technology still being routed through early-stage international protection rather than settled into a handful of national markets.
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Filing trend and technology composition
Two views of the same 4,850 records: how filing activity has moved year over year, and which IPC subclasses carry the claim volume.
Filing trend, 2017-2026
Annual filings rose to a peak of 282 in 2022 before falling to 156 by 2024, a 41% decline over that span. 2025 and 2026 counts are understated by the roughly 18-month lag between filing and publication and should not be read as a continuing decline yet.
IPC subclass composition
H01L (semiconductor devices) and H10N (other electric solid-state devices) together dominate, at 31.5% and 20.8% of the 4,850 records respectively. Optical elements (G02B), batteries (H01M) and power/refrigeration classes each sit in the mid-single digits, reflecting thermoelectric integration work that is smaller in volume but touches adjacent hardware categories.
Shares are the percentage of the 4,850 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Thermoelectric Waste Heat Recovery with Eureka
This page is one run against one query. Ask Eureka your own question about thermoelectric waste heat recovery and every answer comes back with the patent numbers behind it.
Try EurekaA representative early filing
WO1994001893A2 — Thermoelectric device and method of fabrication and thermoelectric generator and vehicle
This invention provides a new thermoelectric device and related method of fabrication with a relatively high conversion efficiency. One application, a thermoelectrically propelled vehicle, utilizes thermoelectric generators that generate electricity according to the Seebeck principle. The thermoelectric generation utilizes at least two parallel layers of alternating n and p-type elements, having hot and cold junctions connecting adjacent elements, that form series electrical connections within each layer, each doped with a varying amount of cobalt so each layer realizes a different optimal thermoelectric temperature.Filed by Technobeam Corporation in 1994, this filing predates most of the dataset and establishes early claim language around multi-layer, differentially-doped thermoelectric stacks.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4074718A | Electrosurgical instrument | 1,115 |
| 2 | US20030089899A1 | Nanoscale wires and related devices | 1,061 |
| 3 | US5436653A | Method and system for recognition of broadcast segments | 795 |
| 4 | US6882051B2 | Nanowires, nanostructures and devices fabricated therefrom | 714 |
| 5 | US20020172820A1 | Methods of fabricating nanostructures and nanowires and devices fabricated therefrom | 568 |
| 6 | US4851095A | Magnetron sputtering apparatus and process | 547 |
| 7 | US5612729A | Method and system for producing a signature characterizing an audio broadcast signal | 531 |
| 8 | US20020175408A1 | Methods of fabricating nanostructures and nanowires and devices fabricated therefrom | 510 |
| 9 | US6580027B2 | Solar cells using fullerenes | 507 |
| 10 | US5120421A | Electrochemical sensor/detector system and method | 503 |
Citation counts inside a searched corpus favour older filings; treat this as a signal of influence on later art, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers say about the field
Three findings that shape how a new filing or freedom-to-operate review should be scoped in this space.
No single assignee controls the field
The leading assignee holds 119 records out of 4,850, and the top 5 combined reach only 10.4% of all records in scope. Even the top 10 combined reach just 16.3%. This is a fragmented landscape with a long tail of single- and few-filing entrants, not one dominated by a handful of blocking portfolios.
Filing activity has pulled back from its 2022 peak
After peaking at 282 records in 2022, annual filings fell to 156 by 2024, a 41% decline over that three-year window. Several of the more active historical assignees show no filings in the most recent complete year, though the usual 18-month publication lag means 2025-2026 figures should not yet be read as confirming a continued slide.
Claim density sits in semiconductor-device classes
H01L and H10N together account for the largest share of records, reflecting how much of this art is filed as semiconductor device structure rather than as systems-level heat-recovery engineering. Classes tied to heat exchanger integration and power electronics, such as F25B and H02J, each sit near 4% — comparatively open ground for systems-level claims.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to thermoelectric waste heat recovery, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranked leaders span universities, automotive thermal-management specialists and materials-focused startups, but the concentration figures show none of them controls a dominant share.
Academic assignees anchor the top of the ranking
University-affiliated assignees hold some of the largest individual portfolios in the ranking, consistent with thermoelectric materials work originating in materials-science and physics departments before moving toward device claims.
Vehicle and industrial heat-recovery specialists sit mid-ranking
Assignees focused on automotive thermal management and industrial waste-heat capture appear through the middle of the ranking rather than at the very top, reflecting a market still assembling supply chains around device suppliers.
Most filing activity sits outside the ranked leaders
With the top 10 combined reaching only 16.3% of all 4,850 records, the large majority of filings come from assignees outside the ranked leaders entirely — a signal that entry barriers around core claims remain low relative to more consolidated hardware fields.
| Assignee | Recent year | YoY |
|---|---|---|
| Brilliant Light Power Inc | 2 | — |
| Massachusetts Institute of Technology | 0 | -100% |
| The Regents of the University of California | 0 | -100% |
| The Trustees of Princeton University | 0 | — |
| BSST LLC | 0 | — |
| Face International Corp | 0 | -100% |
| Alphabet Energy Inc | 0 | — |
| A123 Systems LLC | 0 | — |
Where to take this
The concentration and composition figures point to specific next steps depending on whether the goal is freedom-to-operate or new filing strategy.
Screen the under-claimed branches first
Segmented leg reliability and heat exchanger coupling carry comparatively thin filing volume next to the semiconductor-device core, making them a faster first pass for novelty screening.
Explore white space in EurekaWatch for the 2025-2026 correction
Because publication lags filing by around 18 months, the apparent 2024 low is not yet confirmed as a trend bottom; a fresh pull once 2025 fully publishes will show whether filing has stabilised or continued down.
Track filing trends in EurekaCommon questions about this landscape
The leading assignee in this dataset holds 119 of the 4,850 records in scope, with the field fragmented well beyond that. The top 5 assignees combined account for only 10.4% of all records, and the top 10 combined reach 16.3%. That means no single company or institution controls a blocking share of the art, and freedom-to-operate work needs to look well past the largest few portfolios.
Filing rose to a peak of 282 records in 2022, then declined to 156 by 2024, a drop of 41% over that three-year span. However, publication typically lags filing by roughly 18 months, so the lower counts recorded for 2025 and 2026 are still filling in and should not yet be read as confirmation of a continuing slowdown. A clearer read on the current trajectory will only be available once those years fully publish.
The largest concentration sits in H01L (semiconductor devices), covering 31.5% of the 4,850 records, followed by H10N (other electric solid-state devices) at 20.8%. Smaller but still notable shares appear in G02B, H01M, H02N, H10D, H02J and F25B, each in the 4-7% range. Because records can carry multiple IPC classes, these shares add up to more than 100% of the record total, which is expected.
WO1994001893A2, filed by Technobeam Corporation in 1994, describes a thermoelectric device using parallel layers of alternating n- and p-type elements with differential cobalt doping so each layer targets a different optimal operating temperature, applied to a thermoelectrically propelled vehicle. It predates the great majority of records in this dataset and represents early claim language around multi-layer, temperature-graded thermoelectric stacks. Its practical relevance today depends on jurisdictional status and expiry, which should be checked directly rather than assumed from its age.
Classes tied to systems-level integration, such as heat exchanger coupling (F25B territory) and power supply integration (H02J), each sit at only about 4% of the 4,850 records, well below the semiconductor-device core. Segmented leg design, thermal-cycling reliability at the leg-contact interface, and low-toxicity material substitution also show comparatively thin direct claim coverage relative to filing volume in core device structure. These are reasonable starting points for a novelty screen ahead of a new filing.
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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.