Thermoelectric Materials Patent Landscape 2026
Thermoelectric Materials Patent Landscape in 2026
The thermoelectric materials patent space is concentrated among a small group of Japanese and Korean industrial players, with LG Innotek leading the corpus of 6,530 patent families. The field peaked in 2017 and has since declined materially, though the most recent years reflect publication lag rather than the full picture of recent activity.
LG Innotek leads a concentrated field dominated by Asian industrials
LG Innotek holds the top position in patent records among the top hundred filers, followed closely by Toyota Motor Corporation and LG Chem. The top five filers collectively account for twenty percent of the combined total across the hundred largest filers, signalling moderate-to-high concentration at the apex of the field.
A clear two-tier structure is visible: LG Innotek, Toyota, LG Chem, and Panasonic Intellectual Property Management form a first tier each with several hundred patent records, while the remainder of the top twenty cluster in a narrower band from roughly 160 to 400 records. The gap between the leader and the mid-pack is substantial but not insurmountable.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | LG Innotek Co., Ltd. | 761 | |
| 2 | Toyota Motor Corporation | 622 | |
| 3 | LG Chem, Ltd. | 581 | |
| 4 | Panasonic Intellectual Property Management Co., Ltd. | 457 | |
| 5 | Yamaha Corporation | 392 | |
| 6 | National Institute of Advanced Industrial Science and Technology (AIST) | 385 | |
| 7 | Mitsubishi Materials Corporation | 337 | |
| 8 | Lintec Corporation | 316 | |
| 9 | Hyundai Motor Company | 310 | |
| 10 | Samsung Electronics Co., Ltd. | 306 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Panasonic Holdings Corporation | 291 | |
| 12 | Toshiba Corporation | 291 | |
| 13 | KELK Ltd. | 278 | |
| 14 | Denso Corporation | 251 | |
| 15 | Kyocera Corporation | 243 | |
| 16 | Fujifilm Corporation | 236 | |
| 17 | Sumitomo Chemical Co., Ltd. | 236 | |
| 18 | Commissariat à l’Énergie Atomique et aux Énergies Alternatives (CEA) | 203 | |
| 19 | Gentherm Incorporated | 177 | |
| 20 | The Boeing Company | 163 |
The leaders’ positions reflect vertically integrated strategies — consumer electronics, automotive OEMs, and materials specialists are all represented — suggesting thermoelectric activity is pursued as an enabling component of larger product platforms rather than as a standalone technology.
Data for the most recent 18–24 months is subject to publication lag and will understate actual filing activity; trend interpretations near the end of the series should be treated with caution. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filings have declined from a 2017 peak; device-level IPC classes dominate the mix
The two charts below frame where thermoelectric materials activity has been heading and which technical sub-domains attract the most attention. Together they reveal a maturing, device-oriented field with meaningful adjacent branches in alloy science and power conversion.
Annual filing trend
Filing volume peaked in 2017 and has contracted sharply across the full window; the multi-year decline reflects a real reduction in new entries rather than publication lag for the 2017–2021 range, while counts from 2023 onward are still accumulating and should not be taken as final. Engineers entering the space now face a field with a large, well-cited prior-art base and reduced near-term competitive pressure from new filers.
↗ Hover for values · click a bar to ask EurekaTechnology composition
H10N (other electric solid-state devices) and H01L (semiconductor devices) together account for the overwhelming majority of classified records, confirming that the field is device-architecture-oriented rather than purely materials-science-oriented. Secondary branches — H02N (electric machines), F25B (refrigeration and heat pumps), C22C (alloys), and C01B (inorganic compounds) — represent meaningful but lower-density adjacent domains where differentiated positions may be more accessible.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Thermoelectric generator apparatus with high therm…
A thermoelectric generator apparatus disposed on a high-temperature surface of an object (as a heat source), at least includes a heat concentrator, a thermoelectric module and a cold-side heat sink. The heat concentrator has a top surface and a bottom surface contacting a high-temperature surface of the object, and an area of the bottom surface is smaller… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Nanowires, nanostructures and devices fabricated t… | 714 |
| 2 | Remote power recharge for electronic equipment | 706 |
| 3 | Methods of fabricating nanostructures and nanowire… | 567 |
| 4 | Remote power recharge for electronic equipment | 543 |
| 5 | Methods of fabricating nanostructures and nanowire… | 510 |
| 6 | Thermocouples | 478 |
| 7 | Process device with improved power generation | 477 |
| 8 | Methods of fabricating nanostructures and nanowire… | 399 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents.
What the patent structure means for R&D investment decisions
The combination of a declining filing trend, high concentration, active industry-university collaboration, and a US-led jurisdictional footprint shapes the strategic calculus for any new or incumbent player.
Field is in decline from a 2017 peak
The lifecycle evidence classifies thermoelectric materials as a declining field: annual volume peaked in 2017 and has eased back substantially since. For R&D planners this means a dense prior-art landscape, reduced white space in the core device architecture classes, and an environment where incremental improvements face stiff freedom-to-operate challenges. Investment in truly differentiated sub-domains — particularly materials chemistry and emerging application verticals — is more likely to yield protectable positions than device-level competition with incumbents.
Lifecycle: DeclineTop five hold one-fifth of the hundred largest filers’ combined activity
The top five filers account for twenty percent of the combined patent records across the hundred largest filers, indicating that a small group of vertically integrated companies has built substantial defensive positions. LG Innotek, Toyota, LG Chem, Panasonic Intellectual Property Management, and Yamaha form the leading cohort. New entrants should map freedom-to-operate carefully against these portfolios, particularly in the H10N and H01L device architecture classes where density is highest.
High concentrationHyundai–Kia is the most active co-filing pair; Samsung pursues university links
The most prolific co-filing relationship is between Hyundai Motor Company and Kia Corporation, with 114 jointly filed records, reflecting tight automotive-group coordination. Toyota Motor Corporation and Atsumi Tech Co. collaborate on 34 records. Samsung Electronics is the most networked external collaborator, co-filing with Sungkyunkwan University (23 records), Yonsei University (9 records), and Samsung SDI (18 records). BASF’s 11-record collaboration with Michigan State University signals a materials-chemistry angle worth monitoring. These partnerships map the fastest paths to new capability for organisations without in-house materials expertise.
Ecosystem collaborationUnited States leads filing destinations; Japan, Korea, China, and EPO form the core ring
The United States is the most frequently designated jurisdiction, followed by Europe (EPO), WIPO (PCT), China, Japan, and South Korea. The PCT route’s third-place position confirms broad international protection strategies by leading filers. China’s fourth-place ranking indicates growing strategic importance, while the United Kingdom, Canada, and Australia form a secondary ring. R&D teams planning new filings should prioritise US, EPO, and PCT as the baseline protection triplet, with China coverage increasingly essential for manufacturing-oriented claims.
US-led geographyGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Hyundai Motor Company | Kia Corporation | 114 |
| Toyota Motor Corporation | Atsumi Tech Co., Ltd. | 34 |
| Samsung Electronics Co., Ltd. | 成均馆大学校产学协力团 | 23 |
| Hyundai Motor Company | 延世大学校产学协力团 | 21 |
| Samsung Electronics Co., Ltd. | Samsung SDI Co., Ltd. | 18 |
| Samsung Electronics Co., Ltd. | The Regents of the University of California | 16 |
| BASF SE | Michigan State University | 11 |
| National Institute of Advanced Industrial Science and Technology (AIST) | TES New Energy Co., Ltd. | 10 |
| Toyota Motor Corporation | Nagoya University | 9 |
| Samsung Electronics Co., Ltd. | 延世大学校产学协力团 | 9 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
LG Innotek and Toyota anchor the field from device architecture and automotive angles
The two largest filers represent contrasting emphases: LG Innotek concentrates on solid-state device architecture, while Toyota extends into automotive waste-heat recovery. Both have seen reduced recent filing rates, creating a window for challengers with differentiated technology positions.
LG Innotek
LG Innotek leads the corpus with 761 patent records. Its technology emphasis is concentrated in H10N solid-state device architecture (480 records) and H01L semiconductor devices (384 records), with a smaller position in F25B refrigeration and heat pumps (30 records). Recent filing trend shows a sharp contraction (▼ -80% vs. prior three-year period), suggesting the company has largely consolidated its core portfolio rather than expanding it. Freedom-to-operate analysis in the H10N10 and H01L35 sub-classes should treat LG Innotek as the primary prior-art reference point.
761 patent recordsPanasonic Intellectual Property Management
Panasonic Intellectual Property Management Co., Ltd. ranks fourth with 457 patent records and is the only top-tier filer showing a positive recent trajectory (▲ +13% vs. prior period), making it the most active incremental builder among leading incumbents. Its focus spans H10N solid-state devices (272 records), H01L semiconductor devices (232 records), and H02N electric machines (73 records) — the H02N position is relatively distinctive among the top tier and suggests an interest in generator and energy-harvesting applications beyond pure refrigeration or sensing.
457 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| LG Innotek Co., Ltd. | 51 | ▼ -80% |
| Panasonic Intellectual Property Management Co., Ltd. | 87 | ▲ +13% |
| Mitsubishi Materials Corporation | 15 | ▼ -80% |
| Samsung Electronics Co., Ltd. | 8 | ▼ -73% |
| Hyundai Motor Company | 3 | ▼ -93% |
| National Institute of Advanced Industrial Science and Technology (AIST) | 6 | ▼ -67% |
Under-served branches in power generation machinery and alloy engineering
Relative to the dominant device-architecture classes, several adjacent IPC branches show materially lower filing density. Two in particular combine sparse current coverage with clear technical relevance and a realistic entry path for a focused applicant.
H02N · Electric machines and direct-conversion generators
H02N covers direct energy-conversion machines, including thermomagnetic and thermoelectric generators in a system context beyond the device level. With 2,143 patent records against the much larger H10N and H01L bases, this branch is relatively sparse for its technical adjacency. The entry path is realistic for applicants with system integration expertise: claims can be positioned around generator modules, control architectures, and efficiency management rather than the underlying semiconductor material, which is already heavily covered. Panasonic IP Management and Mitsubishi Materials have the strongest existing positions here, leaving room for automotive and industrial entrants.
Search this in Eureka →C22C · Thermoelectric alloy compositions
C22C (alloys) records 1,135 patent records — roughly six percent of the density of the dominant H10N class. Given that alloy composition is a primary lever for improving the thermoelectric figure of merit (ZT), the relative sparsity here is notable. The branch is technically adjacent but requires materials-chemistry capability rather than semiconductor process know-how, which may explain the lower incumbent density from device-oriented players. BASF’s collaboration with Michigan State University and LG Chem’s C01B inorganic compounds activity signal that materials-chemistry organisations are beginning to move into this space; early positioning in novel half-Heusler, skutterudite, or chalcogenide alloy compositions could yield defensible claims.
Search this in Eureka →How leading applicants differ by technology sub-domain
Strength of each leader across the main technology routes.
| Player | H10N 10 · Other electric solid-state devices | H01L 35 · Semiconductor devices | H02N 11 · Electric machines (other) | F25B 21 · Refrigeration & heat pumps | H01L 23 · Semiconductor devices |
|---|---|---|---|---|---|
| LG Innotek Co., Ltd. | Strong · 480 | Strong · 384 | Absent | Emerging · 30 | Absent |
| LG Chem, Ltd. | Strong · 386 | Strong · 336 | Absent | Absent | Absent |
| Panasonic Intellectual Property Management Co., Ltd. | Strong · 272 | Strong · 232 | Moderate · 73 | Absent | Absent |
| Mitsubishi Materials Corporation | Strong · 235 | Strong · 236 | Moderate · 72 | Absent | Emerging · 22 |
| Samsung Electronics Co., Ltd. | Strong · 243 | Strong · 204 | Absent | Emerging · 17 | Absent |
| Toyota Motor Corporation | Strong · 161 | Strong · 233 | Moderate · 56 | Absent | Absent |
| Hyundai Motor Company | Strong · 222 | Strong · 206 | Absent | Absent | Absent |
Frequently asked questions
The corpus analysed here covers 6,530 patent families in scope globally.
LG Innotek Co., Ltd. leads with 761 patent records among the top-100 filers, ahead of Toyota Motor Corporation (622 records) and LG Chem (581 records).
No. The lifecycle evidence classifies the field as in decline. Annual filing volume peaked in 2017 and has contracted substantially since. The most recent years (2023 onwards) are subject to publication lag and will show higher final counts, but the 2017–2022 contraction is considered reliable.
The United States is the most frequently designated jurisdiction, followed by Europe (EPO), WIPO (PCT), China, Japan, and South Korea. A US + EPO + PCT filing strategy covers the largest share of active protection activity; China is increasingly important for manufacturing-oriented claims.
Hyundai Motor Company and Kia Corporation are the most active co-filing pair (114 jointly filed records), reflecting automotive-group coordination. Samsung Electronics is the most externally networked filer, collaborating with Sungkyunkwan University, Yonsei University, and Samsung SDI. BASF and Michigan State University have an 11-record collaboration in materials chemistry.
H02N (electric machines and direct-conversion generator systems) and C22C (thermoelectric alloy compositions) are relatively sparse compared to the dominant H10N and H01L device classes. C22C in particular may suit applicants with materials-chemistry expertise, as the incumbent device-oriented players have lower density there.
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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.