Photocatalytic Air Purification Patent Landscape 2026
Carrier Corp leads a moderately concentrated field of 1,944 patent families, with the top five filers holding 23% of the hundred largest filers’ combined output. Annual filing volume peaked in 2020 and has since eased, signaling a field moving past its growth phase and into selective, application-specific investment.
Carrier Corp leads a tiered field with a clear gap to challengers
Carrier Corp holds the top position with 99 patent families, nearly double the output of second-ranked Tronox LLC at 49 families, establishing a clear lead over the rest of the field.
The top five applicants — Carrier Corp, Tronox LLC, DBG Group Investments LLC, Seoul Viosys Co Ltd, and TOTO Ltd — together account for 23% of the hundred largest filers’ combined total, indicating moderate concentration with meaningful activity distributed across a broader set of players.
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Carrier Corporation | 99 | |
| 2 | Tronox LLC | 49 | |
| 3 | DBG Group Investments LLC | 41 | |
| 4 | Seoul Viosys Co Ltd | 31 | |
| 5 | TOTO Ltd | 26 | |
| 6 | LG Hausys Ltd | 21 | |
| 7 | Molekule Group Inc | 19 | |
| 8 | Colorobbia Consulting Srl | 19 | |
| 9 | Dyson Technology Ltd | 18 | |
| 10 | Signify Holding BV | 17 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | Samsung Electronics Co Ltd | 17 | |
| 12 | Centre National de la Recherche Scientifique (CNRS) | 16 | |
| 13 | AM Technology Ltd | 16 | |
| 14 | University of Central Florida | 15 | |
| 15 | COUNCIL OF SCI & IND RES | 15 | |
| 16 | ArcelorMittal France SA | 14 | |
| 17 | Akida Holdings LLC | 14 | |
| 18 | South China University of Technology | 13 | |
| 19 | Aerus Medical LLC | 13 | |
| 20 | Chengdu New Keli Chemical Science Co Ltd | 12 |
Carrier Corp’s lead, grounded in separation processes and sterilization, reflects a strategy of integrating photocatalysis into HVAC and air-handling systems, while challengers like Tronox LLC and TOTO Ltd emphasize catalytic material science, suggesting that the ecosystem spans both device and material layers.
Patent records from the most recent 18–24 months are subject to publication lag and likely undercount actual filing activity; interpret 2024–2026 figures as provisional. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A 2020 filing peak followed by easing volume, anchored in separation and catalysis technology
Annual filing trend and technology composition together reveal a field that expanded rapidly through 2020 and has since contracted, while remaining technically broad across filtration, catalysis, and disinfection branches.
Annual filing trend
Filings climbed from 216 in 2017 to a peak of 339 in 2020, then declined steadily through 2022–2024. The 2025–2026 bars reflect publication lag and should be treated as provisional, not as confirmation of a further real decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
Separation processes (B01D) and chemical/physical catalysis (B01J) dominate the branch mix, with sterilization and disinfection (A61L) forming a strong third cluster. Air conditioning integration (F24F) and water treatment adjacency (C02F) represent lower but notable shares, pointing to cross-domain application of the core photocatalytic mechanism.
↗ 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.
Adsorptive photo-catalytic oxidation air purificat…
An air purification system formed from an adsorptive photocatalytic oxidation device and a method of regenerating the oxidation device is disclosed. The air purification system may be configured to be installed within an air duct of a central air handling system. The air purification system may also include an ultraviolet light emitted by the ultraviolet… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Air cleaner | 266 |
| 2 | Photocatalytic air disinfection | 263 |
| 3 | Photocatalyst-binder compositions | 259 |
| 4 | Photocatalytic oxidation of organics using a porou… | 210 |
| 5 | Method and apparatus for destroying organic compou… | 180 |
| 6 | Air purification devices | 149 |
| 7 | Apparatus for photocatalytic fluid purification | 148 |
| 8 | Electrostatic photocatalytic air disinfection | 145 |
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 post-peak lifecycle, moderate concentration, and broad IPC spread shapes where incremental investment is likely to yield differentiated positioning versus where established players already hold dense coverage.
Field is in decline from its 2020 peak
The lifecycle stage is assessed as Decline, with annual filings easing back from the 2020 peak of 339 families. This indicates the core photocatalytic air purification concept is technically mature, and new filings are increasingly focused on incremental refinements or niche applications rather than foundational invention. R&D investment should target differentiated sub-domains rather than broad platform claims.
Post-peak · 2020 apexModerate concentration with a pronounced leader gap
Carrier Corp’s 99-family lead over Tronox LLC’s 49 families creates a two-to-one gap at the top, but the field broadens quickly: rankings six through twenty are held by companies with 13–21 patent families each, including LG Hausys, Molekule Group, Colorobbia Consulting, Dyson Technology, and Signify Holding. This structure suggests the field is contestable in specialized sub-domains even if the top position is well-defended.
Moderate concentrationSparse co-filing with two identified partnerships
The evidence shows two co-applicant pairs: Tronox LLC and Cristal USA with six joint filings, and TOTO Ltd and Daiichi Kigenso Kagaku-Kogyo with three joint filings. Both pairings link a photocatalyst formulator with a titanium dioxide or rare-earth materials supplier, suggesting that material-device integration is the primary collaboration driver. Co-filing activity overall is limited, indicating that the ecosystem is not yet deeply networked.
Sparse co-filingChina dominates filing volume; US and EPO are secondary
China is the leading filing jurisdiction with 1,652 patent records, far ahead of the United States at 583 and Europe (EPO) at 312. WIPO PCT filings stand at 222, and India and South Korea each register 130. The China concentration suggests strong domestic production and commercialization intent, while relatively modest PCT activity implies that global protection strategies remain selective rather than comprehensive.
China-dominantGo 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 |
|---|---|---|
| Tronox LLC | Cristal USA Inc | 6 |
| TOTO Ltd | Daiichi Kigenso Kagaku-Kogyo Co Ltd | 3 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Carrier Corp leads in system integration; DBG Group and Seoul Viosys are new entrants gaining ground
The top two applicants differ substantially in technical emphasis: Carrier Corp anchors activity in air-handling system integration while Tronox LLC focuses on catalytic material science. Among challengers, DBG Group Investments and Seoul Viosys are identified as new entrants in the recent period.
Carrier Corp
Carrier Corp holds 99 patent families, the largest portfolio in the field. Its technology emphasis spans separation processes (B01D 53), sterilization and disinfection (A61L 9), and photocatalytic material structures (B01J 35), reflecting an integrated HVAC-plus-purification strategy. Momentum data was not available for Carrier Corp in the recent-period comparison.
patent families: 99DBG Group Investments LLC
DBG Group Investments LLC holds 41 patent families and is identified as a new entrant in recent filing periods, signaling accelerating commitment to the field. Its technology focus is weighted toward sterilization and disinfection (A61L 9) and separation processes (B01D 53), with a secondary position in general sterilization methods (A61L 2), suggesting a healthcare-adjacent air purification positioning.
patent families: 41| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| DBG Group Investments LLC | 4 | ▲ new entrant |
| Seoul Viosys Co Ltd | 2 | ▲ new entrant |
| Molekule Group Inc | 2 | ▼ -82% |
| Colorobbia Consulting Srl | 2 | ▼ -88% |
Under-served routes in HVAC integration, water treatment, and functional coatings
Several IPC branches sit at the intersection of photocatalysis and adjacent application domains with lower filing density relative to the core branches, representing areas where incremental investment could encounter less established prior art.
F24F · Air conditioning & ventilation integration
F24F accounts for a relatively modest share of records compared to the dominant B01D and B01J branches, despite the logical fit between HVAC air handling and photocatalytic purification modules. Carrier Corp’s portfolio partially addresses this overlap, but the broader applicant set is sparse here. Engineers developing embedded photocatalytic reactor modules for ducted HVAC systems could find differentiated claim space, particularly for residential and commercial building applications.
Search this in Eureka →C09D · Functional photocatalytic coatings
Coatings, paints, and inks (C09D) represent a lower-density branch, with TOTO Ltd and Tronox LLC among the few players with material overlap into this area. Photocatalytic surface coatings — where the purification function is embedded in an architectural or consumer product surface rather than a standalone device — remain underexplored relative to core reactor-based approaches. Entry via collaboration with a coatings formulator or through material doping strategies could yield protectable positions.
Search this in Eureka →How leading applicants differ by technology route emphasis
Route coverage across the main technology branches in the current evidence set.
| Player | B01D 53 · Separation processes (filtration etc.) | B01J 35 · Chemical/physical processes & catalysis | A61L 9 · Sterilising & disinfecting | B01J 21 · Chemical/physical processes & catalysis | B01J 37 · Chemical/physical processes & catalysis |
|---|---|---|---|---|---|
| Carrier Corporation | Strong · 81 | Strong · 45 | Strong · 49 | Moderate · 33 | Moderate · 29 |
| Tronox LLC | Moderate · 11 | Strong · 23 | Absent | Strong · 13 | Moderate · 7 |
| DBG Group Investments LLC | Strong · 17 | Absent | Strong · 33 | Absent | Absent |
| Seoul Viosys Co Ltd | Absent | Strong · 15 | Strong · 26 | Absent | Moderate · 7 |
| Cristal USA Inc | Strong · 13 | Strong · 21 | Absent | Strong · 13 | Absent |
| TOTO Ltd | Absent | Strong · 24 | Absent | Strong · 13 | Moderate · 8 |
| LG Hausys Ltd | Absent | Strong · 18 | Absent | Strong · 12 | Strong · 10 |
Frequently asked questions
The evidence covers 1,944 patent families in scope across this technology area on a global basis.
Carrier Corp is the leading filer with 99 patent families, nearly double the output of second-ranked Tronox LLC at 49 patent families.
China is the dominant filing jurisdiction with 1,652 patent records, well ahead of the United States at 583 and Europe (EPO) at 312.
Annual filing volume peaked in 2020 at 339 families and has eased since, consistent with the field’s assessed Decline lifecycle stage. Recent-year figures (2024–2026) are subject to publication lag and are provisional.
Separation processes (B01D) and chemical/physical catalysis (B01J) are the dominant branches, followed by sterilization and disinfection (A61L). Air conditioning and ventilation (F24F) and water treatment (C02F) form notable but lower-density adjacent clusters.
The evidence identifies two co-applicant pairs: Tronox LLC and Cristal USA with six joint filings, and TOTO Ltd and Daiichi Kigenso Kagaku-Kogyo with three joint filings. Both pairings connect photocatalyst developers with materials suppliers, but overall co-filing activity is limited.
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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.
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