SiC Crystal & Epitaxy Materials Patent Landscape 2026
The SiC crystal and epitaxy materials space is concentrated at the top—Resonac Corp alone holds the leading position among the hundred largest filers—yet the field is still expanding on a multi-year basis, with recent three-year filings sitting well above the prior three-year window, though annual volume eased from its 2023 peak. Activity is anchored in crystal growth (C30B) and semiconductor device (H01L) classes, with the United States as the dominant filing jurisdiction.
Resonac leads a moderately concentrated field with a strong Japanese-American core
Resonac Corp sits firmly at the top of the applicant ranking, followed by Wolfspeed Inc and Toyota Motor Corporation. The top five filers together account for 31% of the combined patent records among the hundred largest filers, signaling meaningful but not absolute concentration.
A clear tier gap separates Resonac from the rest: its count is roughly 60% larger than second-ranked Wolfspeed’s. Below the top two, the next several applicants—Toyota, Denso, and Sumitomo Electric Industries—cluster within a narrower band, forming a competitive second tier.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Resonac Corp | 769 | |
| 2 | Wolfspeed Inc | 474 | |
| 3 | Toyota Motor Corporation | 394 | |
| 4 | Denso Corp | 363 | |
| 5 | Sumitomo Electric Industries Ltd | 360 | |
| 6 | Resonac Holdings Corp | 240 | |
| 7 | Kwansei Gakuin Educational Foundation | 237 | |
| 8 | Toshiba Corporation | 229 | |
| 9 | Fuji Electric Co Ltd | 218 | |
| 10 | Mitsubishi Electric Corporation | 181 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Rohm Co Ltd | 180 | |
| 12 | Toyota Tsusho Corporation | 171 | |
| 13 | SICC Co Ltd | 153 | |
| 14 | Sharp Corporation | 131 | |
| 15 | SiCrystal GmbH | 127 | |
| 16 | NIPPON STEEL & SUMITOMO METAL CORP | 109 | |
| 17 | Nippon Steel Corporation | 104 | |
| 18 | Shin-Etsu Chemical Co Ltd | 101 | |
| 19 | Tongwei Microelectronics Co Ltd | 98 | |
| 20 | Infineon Technologies AG | 93 |
Resonac’s dominant position reflects deep investment across both bulk crystal growth and epitaxial deposition, while challengers like Wolfspeed and Toyota bring distinct emphases in device-adjacent crystal technology. This structure creates entry barriers at the core but leaves room for specialist positioning in adjacent branches.
The most recent 18–24 months of filing data are subject to publication lag and will appear more active as records are published; the apparent dip in 2024–2026 does not reflect a genuine decline in activity. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A 2023 filing peak, multi-year growth, and a crystal-growth-dominated technology mix
The annual filing trend and technology composition charts together reveal a field that peaked in 2023 on an annual basis but remains in net growth on a multi-year view, with crystal growth IP representing the dominant share of technical activity.
Annual filing trend
Filings rose steadily from 2017 through a 2023 peak, reflecting accelerating industry investment in SiC substrate and epitaxy supply chains. The 2024 count is lower than 2023, and 2025–2026 figures are substantially undercounted due to publication lag; neither should be read as a structural decline. The field’s recent three-year window still sits well above the prior three-year window, confirming net growth.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C30B (crystal growth) is the dominant IPC class by a wide margin, reflecting the material-science foundation of the field. H01L (semiconductor devices) ranks second, illustrating how crystal and epitaxy IP tightly couples to downstream device fabrication. H10P and H10D (semiconductor device variants) and C23C (coating and surface deposition) are meaningful secondary branches. Smaller classes such as C01B, C04B, B24B, and G01N point to chemistry, ceramics, polishing, and characterization activities at the periphery.
↗ 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.
SiC SUBSTRATE PRODUCTION METHOD
The present invention addresses the problem of providing a novel SiC substrate production method. The SiC substrate production method according to the present invention comprises an etching step S<b>10</b> of etching a SiC base substrate <b>10</b>, a crystal growth step S<b>20</b> of growing a SiC substrate layer <b>13</b> on the SiC base substrate… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Method of improving mechanically prepared substrat… | 1,204 |
| 2 | Pendeoepitaxial gallium nitride semiconductor laye… | 755 |
| 3 | Semi-insulating silicon carbide without vanadium d… | 589 |
| 4 | Systems and methods for epitaxially depositing fil… | 491 |
| 5 | High brightness electroluminescent device emitting… | 484 |
| 6 | Process for Preparing Graphene on a SiC Substrate … | 471 |
| 7 | Method for doping semiconductor materials | 431 |
| 8 | Susceptor designs for silicon carbide thin films | 400 |
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. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the competitive structure means for R&D investment decisions
Four structural dimensions—lifecycle stage, applicant concentration, collaborative ecosystems, and geographic spread—shape where defensible positions remain available and where incumbents are entrenched.
Growth stage, past its 2023 annual peak
The field is classified as Growth: recent three-year filings sit well above the prior three-year window, confirming multi-year expansion. However, annual volume eased from the 2023 peak, suggesting the fastest phase of ramp-up is behind the field. New entrants face a maturing but still-active patent landscape rather than a nascent one, making freedom-to-operate analysis increasingly important.
Lifecycle: GrowthTop five hold 31% of the hundred largest filers’ combined records
With Resonac Corp, Wolfspeed Inc, Toyota Motor Corporation, Denso Corp, and Sumitomo Electric Industries forming the top tier, the field is moderately concentrated but not monopolized. The gap between first and second place is significant, yet the second tier is competitive enough that challengers can realistically reach top-ten positions through focused investment in adjacent branches or device-integration IP.
Moderate concentrationKwansei Gakuin–Toyota Tsusho and Toyota–Denso are the busiest co-filing pairs
The most active collaboration pair is Kwansei Gakuin Educational Foundation and Toyota Tsusho Corp, with 153 joint filings, reflecting an academia-trading-company axis focused on crystal growth fundamentals. Toyota Motor Corporation and Denso Corp co-filed on 75 records, and Toyota and Nippon Steel & Sumitomo Metal Corp on 74, highlighting automotive supply-chain integration. Sumitomo Electric Industries appears in three separate collaboration pairs—with SiCrystal, Mitsubishi Corp, and Kansai Electric Power—indicating a hub role in the broader ecosystem.
Academia–industry linksUS leads filings; China is the fastest-rising secondary jurisdiction
The United States is the primary filing destination, followed by China and Japan. Europe (EPO) and WIPO (PCT) filings provide meaningful international coverage. The presence of China-headquartered applicants such as SICC Co Ltd, Tongwei Microelectronics, and several others in the top-100 list signals that Chinese firms are building domestic and international portfolios, making China an increasingly important jurisdiction to monitor for freedom-to-operate and competitive benchmarking.
US-led, China risingGo 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 |
|---|---|---|
| Kwansei Gakuin Educational Foundation | Toyota Tsusho Corporation | 153 |
| Toyota Motor Corporation | Denso Corp | 75 |
| Toyota Motor Corporation | NIPPON STEEL & SUMITOMO METAL CORP | 74 |
| Resonac Holdings Corp | Denso Corp | 63 |
| Denso Corp | Toyota Central R&D Labs Inc | 49 |
| Sumitomo Electric Industries Ltd | SiCrystal GmbH | 37 |
| Sumitomo Electric Industries Ltd | Mitsubishi Corporation | 37 |
| Toyota Motor Corporation | Nippon Steel Corporation | 31 |
| Denso Corp | Central Research Institute of Electric Power Industry | 30 |
| Sumitomo Electric Industries Ltd | Kansai Electric Power Co Ltd | 28 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Resonac dominates crystal growth; Wolfspeed matches on growth fundamentals with stronger device overlay
The top two applicants are both deeply anchored in C30B crystal growth IP, but differ in trajectory and device-integration emphasis. Their positions define the competitive ceiling new entrants must address.
Resonac Corp
Resonac Corp leads the ranking with 769 patent records, concentrated across C30B 29 (crystal growth), H01L 21 (semiconductor processing), and C30B 23 (vapor-phase crystal growth). Its momentum trend shows a decline of 75% in recent filings versus the prior period, which—given its scale—may reflect portfolio consolidation or a shift toward fewer, broader filings rather than genuine withdrawal. The related entity Resonac Holdings Corp adds 240 further records, reinforcing the group’s commanding position.
patent records: 769Wolfspeed Inc
Wolfspeed Inc holds 474 patent records and mirrors Resonac’s emphasis on C30B 29 and C30B 23 crystal growth, while also carrying a meaningful H01L 21 semiconductor device component. Its recent filing trend shows a 23% decline versus the prior period, but as the field’s leading US-headquartered pure-play SiC supplier, its portfolio remains strategically significant for anyone entering the North American market or licensing discussions.
patent records: 474| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Resonac Holdings Corp | 24 | ▼ -75% |
| Wolfspeed Inc | 20 | ▼ -23% |
| Toyota Motor Corporation | 19 | ▲ new entrant |
| Denso Corp | 30 | ▬ +3% |
| Sumitomo Electric Industries Ltd | 10 | ▲ new entrant |
| Toshiba Corporation | 7 | ▼ -68% |
| Kwansei Gakuin Educational Foundation | 16 | ▼ -88% |
| Fuji Electric Co Ltd | 23 | ▼ -18% |
Under-served branches adjacent to the dominant crystal-growth core
Several IPC classes sit at lower relative share within the corpus despite plausible technical linkage to SiC crystal and epitaxy; these are observations of relative sparsity that warrant evaluation before being treated as investment targets.
C23C · Coating & surface deposition
C23C covers thin-film deposition processes—CVD, PVD, ALD—that are directly relevant to SiC epitaxial layer deposition and surface passivation. Its share is relatively modest given how central deposition process engineering is to epitaxy quality. Engineers developing novel precursor chemistries, reactor designs, or low-temperature deposition routes for SiC may find this branch less contested than the C30B core, with an entry path through process-level claims rather than crystal bulk claims.
Search this in Eureka →C01B · Non-metallic elements & inorganic compounds
C01B captures synthesis and purification of silicon carbide precursor materials, high-purity silicon, and carbon sources—upstream inputs whose quality directly governs crystal defect density and doping control. With a relatively low share compared to device and crystal growth classes, this branch may be under-patented relative to its commercial importance. Applicants focused on precursor chemistry, gas-phase silicon and carbon source purity, or novel SiC powder synthesis routes could find defensible space here.
Search this in Eureka →Frequently asked questions
Resonac Corp leads the ranking with 769 patent records among the top-100 applicants, ahead of Wolfspeed Inc at 474 and Toyota Motor Corporation at 394. The related entity Resonac Holdings Corp holds an additional 240 records, reinforcing the group’s position.
The field is classified as Growth: recent three-year filings sit well above the prior three-year window, confirming net multi-year expansion. Annual volume peaked in 2023 and has eased since, but the most recent years are further understated by publication lag, so the apparent dip does not signal a genuine decline.
The United States is the leading jurisdiction, followed by China and Japan. Europe (EPO) and WIPO (PCT) provide significant international coverage. South Korea, Germany, and Taiwan are additional relevant jurisdictions, reflecting the global supply-chain importance of SiC substrates.
C30B (crystal growth) is the dominant class by a wide margin, reflecting the material-science core of the field. H01L (semiconductor devices) ranks second, followed by H10P, H10D, and C23C (coating and surface deposition). This distribution shows that IP spans from fundamental crystal growth through to device fabrication.
The most active co-filing pair is Kwansei Gakuin Educational Foundation and Toyota Tsusho Corp with 153 joint filings, followed by Toyota Motor Corporation and Denso Corp at 75, and Toyota Motor Corporation and Nippon Steel & Sumitomo Metal Corp at 74. These pairings reflect both automotive supply-chain integration and academia-industry knowledge transfer.
The C23C (coating and surface deposition) and C01B (non-metallic elements and inorganic compounds) branches show lower relative shares compared to the dominant C30B and H01L classes. These branches cover deposition process engineering and precursor chemistry respectively—areas with direct technical linkage to SiC epitaxy quality but fewer incumbent filings. Any entry decision should be preceded by a freedom-to-operate analysis, as sparsity alone does not guarantee open space.
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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.
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