Photocatalyst Design Patent Landscape 2026
The photocatalyst design field spans 7,952 patent families and has reached a mature plateau, with annual volume holding near peak levels and a clear leader—TOTO LTD—holding a commanding position built on catalytic-body and surface-treatment filings. China and Japan together dominate both filing jurisdiction and top applicant rankings, while a dense mix of universities and industrial labs signals that competitive pressure is broadly distributed across the second tier.
TOTO LTD leads a moderately concentrated field where academic institutions fill the second tier
TOTO LTD occupies the top position with 561 patent families—more than twice the nearest industrial competitor, Saint-Gobain Vitrage SA at 217 patent families—establishing a clear first-tier incumbency in photocatalytic surface and self-cleaning applications.
The top five filers account for 17% of the combined output of the hundred largest filers, indicating moderate concentration: TOTO’s lead is distinctive, but no single bloc controls the field. The second and third tiers are populated almost entirely by universities—Guilin University of Technology (208), Shaanxi University of Science and Technology (147), Zhejiang University (135), and multiple other Chinese and Japanese academic institutions—which compresses the gap between industrial and academic players.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | TOTO Ltd. | 561 | |
| 2 | Saint-Gobain Vitrage SA | 217 | |
| 3 | Guilin University of Technology | 208 | |
| 4 | SHAANXI UNIV OF SCI & TECH | 147 | |
| 5 | National Institute of Advanced Industrial Science and Technology (AIST) | 147 | |
| 6 | Centre National de la Recherche Scientifique (CNRS) | 137 | |
| 7 | Zhejiang University | 135 | |
| 8 | Shin-Etsu Chemical Co., Ltd. | 129 | |
| 9 | The University of Tokyo | 129 | |
| 10 | Wuhan University of Technology | 120 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | Fuzhou University | 119 | |
| 12 | Jiangsu University | 116 | |
| 13 | Ishihara Sangyo Kaisha, Ltd. | 102 | |
| 14 | TOSHIBA LIGHTING & TECHNOLOGY CORP | 98 | |
| 15 | Nitto Denko Corporation | 97 | |
| 16 | Shanghai Jiao Tong University | 96 | |
| 17 | Nanjing University | 94 | |
| 18 | Sumitomo Chemical Co., Ltd. | 94 | |
| 19 | Central Research Institute of Electric Power Industry | 93 | |
| 20 | Panasonic Holdings Corporation | 92 |
TOTO’s deep integration across catalytic-body design, surface coatings, and material composition subclasses gives it broad freedom-to-operate across commercial product lines. Challengers seeking differentiation will need to identify sub-domains where TOTO’s portfolio is thinner, particularly in applied end-use segments such as water treatment or sterilization.
The most recent filing years (2025–2026) are subject to publication lag and underrepresent actual activity; trend reads for those years should be treated as provisional. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing volume has plateaued near peak while catalysis core remains dominant across a broad technology mix
The annual filing trend and the IPC technology composition together reveal a field that is technically mature but still generating steady volume, with the dominant catalysis branch anchoring a wide spread of applied end-use classes.
Annual filing trend
Annual filings ran between roughly 820 and 870 patent families per year from 2017 through 2021, dipped in 2022, then recovered strongly to reach a recorded peak in 2024. The 2025 and 2026 figures are subject to publication lag and should not be read as a downturn; the overall trajectory is consistent with a mature field holding near its ceiling rather than declining.
↗ Hover for values · click a bar to ask EurekaTechnology composition
B01J (Chemical/physical processes and catalysis) is the dominant class by a wide margin, anchoring the field’s core. Secondary classes—C02F (water and wastewater treatment), B01D (separation processes), C01B (inorganic compounds), C01G (metal compounds), and A61L (sterilization and disinfection)—reflect the breadth of photocatalyst applications across environmental remediation, surface coatings, and life-science end-uses. Classes such as C09D (coatings and paints), C03C (glass), and B32B (layered products) show the continued relevance of photocatalytic surface-functionalization routes.
↗ 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.
Heterojunction photocatalyst, photocatalyst compos…
The present invention provides a heterojunction photocatalyst having higher photocatalytic activity than that of a conventional heterojunction photocatalyst. Further, the present invention provides a photocatalyst composite having the heterojunction photocatalyst on a substrate, a method for producing the heterojunction photocatalyst, and a method for… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Photocatalytic body and its production | 424 |
| 2 | Electrochromic device having a self-cleaning hydro… | 315 |
| 3 | Niobium nitride and method for producing same, nio… | 311 |
| 4 | Anti-fog element | 247 |
| 5 | Photocatalyst and its production | 231 |
| 6 | Photocatalytic body | 218 |
| 7 | Photocatalytic oxidation of organics using a porou… | 210 |
| 8 | Multi-functional material with photocalytic functi… | 197 |
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
The combination of a mature lifecycle, moderate concentration, active academic collaboration networks, and. China-Japan jurisdiction dominance shapes the risk and opportunity profile for any new entrant or incumbent extending their portfolio.
Field is at plateau maturity with annual filings holding near peak
Annual filing volume has plateaued near its peak levels, consistent with a field where foundational mechanisms are well-established and incremental optimization dominates new filings. R&D investment in core TiO2-type photocatalytic processes faces dense prior art; differentiation requires targeting underserved application branches or next-generation material compositions. The 1% recent-window growth figure confirms stability rather than expansion.
Lifecycle: MaturityModerate concentration with a single industrial leader and a crowded academic second tier
The top five filers hold 17% of the hundred largest filers’ combined output, with TOTO LTD’s 561 patent families giving it a roughly 2.6× lead over the nearest rival. Below TOTO, the ranking is populated by universities from China and Japan, creating a tier structure where academic publication volume can obscure the comparative thinness of commercial-grade, enforceable portfolios in the second tier. Industrial challengers like Shin-Etsu Chemical (129 patent families) and Nitto Denko (97 patent families) maintain focused positions without approaching TOTO’s breadth.
Concentration: ModerateCNRS and TOTO anchor the two most active co-filing networks
The Centre National de la Recherche Scientifique (CNRS) is the most prolific co-filer, with 40 joint patent families alongside Claude Bernard Lyon 1 University, 23 with IFP Energies Nouvelles, and 18 with the University of Strasbourg—forming a cohesive French public-research consortium. TOTO LTD operates its own collaboration cluster, co-filing 21 families with the Japan Technological Research Association of Artificial Photosynthetic Chemical Process, 18 with Taki Chemical, and 16 with Ishihara Sangyo Kaisha. Saint-Gobain Vitrage SA and Rhodia Chemicals share 14 joint filings. Zhejiang University and Zhejiang Tianlang Environmental Protection Technology co-filed 10 families, illustrating a university-industry transfer model active in China.
Collaboration: ActiveChina and Japan dominate filings; US and Europe are secondary protection targets
China is the leading filing jurisdiction by a wide margin, followed by Japan, with the United States, WIPO (PCT), and Europe (EPO) as secondary protection routes. India appears as a notable emerging jurisdiction. The strong China-Japan axis reflects where most applicants are headquartered and where manufacturing scale is concentrated. For companies seeking global freedom-to-operate, PCT and EPO routes are active but not dominant, suggesting that enforcement exposure outside Asia may be lower than raw family counts imply.
Geography: Asia-ledGo 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 |
|---|---|---|
| Centre National de la Recherche Scientifique (CNRS) | Claude Bernard Lyon 1 University | 40 |
| Centre National de la Recherche Scientifique (CNRS) | IFP Energies Nouvelles | 23 |
| TOTO Ltd. | Japan Technological Research Association of Artificial Photosynthetic Chemical Process | 21 |
| TOTO Ltd. | Taki Chemical Co., Ltd. | 18 |
| Centre National de la Recherche Scientifique (CNRS) | University of Strasbourg | 18 |
| TOTO Ltd. | Ishihara Sangyo Kaisha, Ltd. | 16 |
| Saint-Gobain Vitrage SA | Rhodia Chimie (Rhodia Chemicals) | 14 |
| Centre National de la Recherche Scientifique (CNRS) | French Alternative Energies and Atomic Energy Commission (CEA) | 13 |
| TOTO Ltd. | The University of Tokyo | 10 |
| Zhejiang University | Zhejiang Tianlang Environmental Protection Technology Co., Ltd. | 10 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
TOTO LTD leads by a wide margin; academic challengers define the second tier
The leader-challenger gap in photocatalyst design is primarily an industrial-versus-academic divide, with TOTO LTD holding a commercially oriented portfolio built on decades of product-linked filings, while the second tier is defined by university labs pursuing application breadth in catalysis and water treatment.
TOTO LTD
TOTO LTD holds 561 patent families, the largest portfolio in the field. Its technology emphasis is concentrated in catalytic-body and surface-catalyst subclasses (B01J 35, B01J 21, B01J 23), consistent with its commercial focus on self-cleaning, anti-fouling, and anti-microbial surface products. Recent filing momentum shows a –73% decline from its prior three-year pace, indicating that TOTO’s portfolio is maturing and new filings are selective rather than expansive—a typical posture for a market leader protecting established product lines.
families: 561Guilin University of Technology
Guilin University of Technology holds 208 patent families and is classified as a new entrant in momentum terms, reflecting a recent ramp-up in activity. Its technology emphasis spans metal-compound catalysis (B01J 23) and water-treatment applications (C02F 1), suggesting an applied research orientation toward environmental remediation rather than surface-coating end-uses. As an academic filer, its portfolio represents research priority rather than direct commercial deployment, but its filing pace makes it one of the most active institutions in the current period.
families: 208| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| TOTO Ltd. | 3 | ▼ -73% |
| Guilin University of Technology | 6 | ▲ new entrant |
| Saint-Gobain Vitrage SA | 1 | ▲ new entrant |
| Shaanxi University of Science and Technology | 31 | ▼ -43% |
| Zhejiang University | 10 | ▼ -55% |
| National Institute of Advanced Industrial Science and Technology (AIST) | 1 | ▼ -92% |
| Centre National de la Recherche Scientifique (CNRS) | 10 | ▲ new entrant |
| Wuhan University of Technology | 8 | ▼ -38% |
Under-served adjacent branches worth monitoring for entry or partnership
Several IPC classes adjacent to the dominant B01J core show meaningful filing counts relative to the total scope but represent lower shares of the overall activity, suggesting that photocatalytic principles have been partially but not exhaustively extended into these domains.
A61L · Sterilisation and Disinfection
A61L is an adjacent branch with a share that remains relatively limited compared to the core catalysis class, despite photocatalytic antimicrobial surfaces being a technically plausible and commercially relevant application area. The COVID-era demand for surface sterilization has receded but hospital-acquired infection control and HVAC disinfection remain active problem spaces. An entrant with established photocatalyst material IP could extend into this branch through application-specific claims on substrate integration and inactivation kinetics, where the prior art is less dense than in core catalysis.
Search this in Eureka →C25B · Electrolytic Production of Compounds
C25B captures photoelectrochemical and electrocatalytic compound production, including water splitting for hydrogen generation—a high-priority energy transition application. Its presence in the technology composition reflects early-stage intersection between photocatalysis and electrochemical systems, but its relative share is modest, indicating that the patent landscape here is not yet crowded. Technically, this branch requires coupling photocatalyst design with electrode architecture and electrolyte engineering, creating a multi-disciplinary entry barrier that also reduces the number of competitors currently active.
Search this in Eureka →How leading applicants differ by technology subclass emphasis
Route coverage across the main technology branches in the current evidence set.
| Player | B01J 35 · Chemical/physical processes & catalysis | B01J 23 · Chemical/physical processes & catalysis | B01J 21 · Chemical/physical processes & catalysis | B01J 37 · Chemical/physical processes & catalysis | C02F 1 · Water & wastewater treatment |
|---|---|---|---|---|---|
| TOTO Ltd. | Strong · 545 | Moderate · 242 | Strong · 279 | Moderate · 240 | Absent |
| Guilin University of Technology | Absent | Strong · 374 | Absent | Absent | Emerging · 71 |
| Shaanxi University of Science and Technology | Strong · 100 | Strong · 104 | Absent | Strong · 58 | Strong · 81 |
| Shin-Etsu Chemical Co., Ltd. | Strong · 121 | Strong · 91 | Absent | Strong · 72 | Absent |
| Saint-Gobain Vitrage SA | Strong · 226 | Absent | Moderate · 55 | Absent | Absent |
| Centre National de la Recherche Scientifique (CNRS) | Strong · 127 | Absent | Moderate · 51 | Moderate · 60 | Absent |
| The University of Tokyo | Strong · 123 | Strong · 66 | Absent | Moderate · 48 | Absent |
Frequently asked questions
The landscape in scope contains 7,952 patent families, reflecting decades of activity across materials synthesis, surface functionalization, environmental remediation, and antimicrobial applications.
TOTO LTD holds the largest portfolio with 561 patent families, more than twice the count of the next-largest industrial filer, Saint-Gobain Vitrage SA at 217 patent families. TOTO’s focus is concentrated in catalytic-body structural forms and surface-catalyst subclasses, consistent with its commercial self-cleaning and anti-fouling product lines.
The field is at a maturity plateau, with annual filings holding near their peak levels and a recent-window growth rate of 1%. This indicates that foundational mechanisms are well-established and incremental optimization, rather than breakthrough discovery, characterizes most new filings.
China is the leading filing jurisdiction by a considerable margin, followed by Japan. The United States, WIPO (PCT), and Europe (EPO) are the principal secondary protection routes. India also appears as a notable emerging jurisdiction. The strong Asia-Pacific concentration reflects where most top applicants are headquartered.
The Centre National de la Recherche Scientifique (CNRS) is the most active co-filer, with 40 joint patent families alongside Claude Bernard Lyon 1 University, 23 with IFP Energies Nouvelles, and 18 with the University of Strasbourg. TOTO LTD co-filed 21 families with the Japan Technological Research Association of Artificial Photosynthetic Chemical Process, 18 with Taki Chemical, and 16 with Ishihara Sangyo Kaisha.
A61L (sterilisation and disinfection) and C25B (electrolytic production of compounds, including photoelectrochemical hydrogen generation) are two adjacent branches with lower filing density relative to the dominant B01J catalysis core. Both have plausible technical links to photocatalyst design and represent areas where prior art is less saturated, though entry still requires purpose-built application claims and material-specific expertise.
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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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