RO Desalination Plant Scale-Up Patent Landscape
The RO desalination plant scale-up patent space is a relatively compact field dominated by membrane-separation and water-treatment specialists, with NanoH2O and Dow Global Technologies holding the leading positions. Annual filings peaked in 2019 and have since eased, signalling a field in consolidation where incremental membrane performance and system-integration patents remain the primary battleground.
NanoH2O and Dow lead a fragmented but concentrated top tier
NanoH2O Co Ltd ranks first with 16 patent records, followed closely by Dow Global Technologies LLC with 14 and VITO (Vlaamse Instelling voor Technologisch Onderzoek) with 12, establishing a clear but narrow top-three cluster in a corpus of 98 patent families.
The top five filers account for 27% of the combined total across the hundred largest filers, indicating moderate concentration: the leading trio holds a measurable advantage, but the gap to mid-tier players such as Microban Products (11 records) and Toray Advanced Materials Korea (9 records) is not insurmountable for a well-resourced entrant.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | NanoH2O Co Ltd | 16 | |
| 2 | Dow Global Technologies LLC | 14 | |
| 3 | VITO (Vlaamse Instelling voor Technologisch Onderzoek) | 12 | |
| 4 | Microban Products Co Inc | 11 | |
| 5 | Toray Advanced Materials Korea Inc | 9 | |
| 6 | IDE Water Technologies Ltd | 8 | |
| 7 | NL Chemical Technology | 7 | |
| 8 | The Research Foundation for the State University of New York | 6 | |
| 9 | Eco Technologies Inc | 6 | |
| 10 | Seebio Inc | 6 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Katz Water Tech LLC | 6 | |
| 12 | ZNano LLC | 5 | |
| 13 | Diamond Gold Investors LLC | 4 | |
| 14 | SEOUL NATIONAL UNIVERSITY R&DB FOUNDATION | 4 | |
| 15 | HYDROCARBON TECHNOLOGY & INNOVATION LLC | 4 | |
| 16 | Ecodesal | 3 | |
| 17 | Dehlsen Associates of the Pacific Ltd | 3 | |
| 18 | LG Chem Ltd | 3 | |
| 19 | Fomin Vladimir Fjodorovich | 3 | |
| 20 | KOREA UNIV RES & BUSINESS FOUND | 3 |
NanoH2O’s lead reflects its nanocomposite membrane heritage, while Dow’s comparable position underscores that incumbent membrane manufacturers remain the structural anchors of this space. The presence of IDE Water Technologies and VITO alongside chemical majors points to an ecosystem spanning materials science, systems integration, and water-engineering research.
Filing counts for 2024–2026 are subject to publication lag and should be treated as underestimates of actual inventive activity in those years. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity peaked in 2019 and the IPC mix is overwhelmingly membrane-separation focused
The annual filing trend reveals a clear 2019 peak followed by moderation, while the technology composition shows that separation-process (B01D) and water-treatment (C02F) classes together dominate the corpus, with a long tail of adjacent classes.
Annual filing trend
Filings rose sharply from 3 records in 2017 to a peak of 21 in 2019, then settled into a range of 9–15 through 2024. The 2025 and 2026 figures (4 and 2 respectively) reflect publication lag and should not be read as a further decline. The 2019 peak coincides with broad commercialisation of thin-film nanocomposite membranes.
↗ Hover for values · click a bar to ask EurekaTechnology composition
B01D (Separation processes) and C02F (Water and wastewater treatment) are the dominant classes, reflecting the membrane-chemistry and system-engineering core of the field. A smaller cluster around H01M (Batteries/fuel cells), A01N (Biocides), and C25B (Electrolytic production) signals adjacent work on energy recovery, biofouling control, and electrochemical pre-treatment — each with single-digit representation.
↗ 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.
Central tube set, spiral wound reverse osmosis mem…
Disclosed is a central tube set. The central tube set includes: a permeate tube, a peripheral wall of the permeate tube being arranged with a pure water influx hole communicating with an internal channel of the permeate tube; and a plurality of wastewater tubes arranged at intervals. The wastewater tubes are arranged around the permeate tube, a peripheral… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Reverse osmosis purification apparatus | 182 |
| 2 | Micro-and nanocomposite support structures for rev… | 150 |
| 3 | Spiral-wound membrane cartridge | 123 |
| 4 | Reverse osmosis water purifying system | 87 |
| 5 | Antimicrobial semi-permeable membranes | 76 |
| 6 | Self-Assembled Surfactant Structures | 70 |
| 7 | Reject water drain line installation system and ap… | 65 |
| 8 | Reject water drain line installation system and ap… | 60 |
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 patent structure means for R&D investment decisions
The combination of a post-peak lifecycle, moderate concentration, limited cross-sector collaboration, and US-heavy jurisdiction coverage shapes the strategic options available to new entrants and incumbents alike.
Field is in decline from a 2019 peak
The lifecycle stage is Decline, with annual filings easing back from the 2019 high of 21 records. This does not mean the underlying technology is spent — it more likely reflects consolidation of the core membrane-chemistry IP and a shift of R&D effort toward system-level engineering and operational optimisation that may not yet be fully captured in published patents. New entrants should expect a well-staked core and look for system-integration and hybrid-process white space.
Lifecycle: DeclineModerate top-tier concentration with a reachable mid-tier
The top five filers hold 27% of the hundred largest filers’ combined total, a moderate concentration level. The gap between the top three (NanoH2O 16, Dow 14, VITO 12) and the next tier (Microban 11, Toray Advanced Materials Korea 9) is narrow enough that a focused filing programme in an under-served sub-domain could reposition a challenger within two to three years. The long tail of single-digit filers suggests significant fragmentation below the top tier.
Concentration: moderateCross-institutional co-filing is rare; one academic pair identified
The only co-applicant relationship in evidence is a single joint filing between The Research Foundation for the State University of New York and Cleveland State University Research Corp. This low collaboration density is notable given the applied-engineering nature of RO scale-up; it may reflect the commercial sensitivity of process know-how or simply the early stage of university–industry partnerships in this niche. Parties seeking to accelerate capability could find open co-development opportunities with academic water-technology groups.
Collaboration: sparseUS is the primary protection market; Asia and Europe are secondary
The United States leads jurisdiction coverage, followed by South Korea, Europe (EPO), India, and China. Israel (8 records) reflects IDE Water Technologies’ home-market filings. The relatively strong South Korean presence aligns with Toray Advanced Materials Korea and LG Chem. India’s position (20 records) is noteworthy given its large-scale desalination programme, suggesting protection is being sought in key deployment markets rather than solely in innovation hubs.
Lead office: USGo 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 |
|---|---|---|
| The Research Foundation for the State University of New York | Cleveland State University Research Corp | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
NanoH2O leads on membrane materials; Dow matches on separation-process breadth
The two front-runners differ in emphasis: NanoH2O’s position is built on nanocomposite membrane innovation, while Dow’s portfolio spans the full B01D separation-process sub-class hierarchy. IDE Water Technologies is the most active new entrant among tracked applicants.
NanoH2O Co Ltd
NanoH2O leads the ranking with 16 patent records, anchored in nanocomposite membrane architecture. Its technology focus is not broken out separately in the route matrix for this entity, but its citation record — including the highly cited ‘Micro- and nanocomposite support structures’ patent — confirms a materials-science-first approach to membrane performance. Momentum data for NanoH2O is not separately flagged in the applicant-momentum dataset, suggesting its filing base was established in prior periods.
16 patent recordsIDE Water Technologies Ltd
IDE Water Technologies Ltd holds 8 patent records and is flagged as a new entrant in the recent filing period, indicating an accelerating presence. Its technology emphasis spans C02F 1 (water treatment), C25B 9, and C25B 1 (electrolytic production), pointing to a differentiated focus on electrochemical pre-treatment and brine management alongside conventional RO system design — a combination well suited to large plant scale-up challenges. This trajectory makes IDE a challenger worth monitoring closely.
8 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| IDE Water Technologies Ltd | 6 | ▲ new entrant |
| The Research Foundation for the State University of New York | 1 | ▲ new entrant |
Under-served branches adjacent to the RO scale-up core
Several IPC classes appear at low frequency relative to the dominant B01D/C02F core, representing under-served adjacent areas. Two of these have plausible technical value for large-plant scale-up and a realistic entry path given existing engineering knowledge.
C25B · Electrolytic production of compounds
With only 8 patent records and a 2% share among the hundred largest filers’ combined IPC assignments, electrochemical pre-treatment and brine valorisation (C25B) is sparsely covered despite growing commercial interest in zero-liquid-discharge and mineral-recovery integration at large RO plants. IDE Water Technologies’ focus on C25B sub-classes signals that at least one player sees this as a genuine scale-up lever. An entrant with electrochemical process expertise could file in this branch without facing a dense prior-art wall.
Search this in Eureka →E21B · Earth and rock drilling (wells)
The E21B class (wells and drilling) appears only 6 times in the corpus, suggesting that subsurface water sourcing and well-field design for large RO intake systems is an under-documented area. For large coastal or inland plants where intake engineering is a scale-limiting factor, IP in this adjacent domain could provide a defensible position. Entry would require interdisciplinary expertise spanning hydrogeology and membrane-systems engineering, but no incumbent appears to hold a blocking position here.
Search this in Eureka →How leading filers differ by technology route
Route coverage across the main technology branches in the current evidence set.
| Player | B01D 61 · Separation processes (filtration etc.) | C02F 1 · Water & wastewater treatment | B01D 71 · Separation processes (filtration etc.) | B01D 69 · Separation processes (filtration etc.) | B01D 63 · Separation processes (filtration etc.) |
|---|---|---|---|---|---|
| LG Chem Ltd | Strong · 19 | Moderate · 6 | Strong · 19 | Strong · 19 | Absent |
| Dow Global Technologies LLC | Strong · 14 | Absent | Strong · 13 | Strong · 11 | Strong · 8 |
| Microban Products Co Inc | Absent | Absent | Strong · 10 | Strong · 10 | Strong · 11 |
| Toray Advanced Materials Korea Inc | Strong · 6 | Absent | Strong · 6 | Strong · 6 | Absent |
| The Research Foundation for the State University of New York | Strong · 6 | Strong · 6 | Strong · 5 | Absent | Absent |
| ZNano LLC | Absent | Strong · 4 | Strong · 3 | Strong · 3 | Strong · 3 |
| Seebio Inc | Strong · 6 | Strong · 6 | Absent | Absent | Absent |
Frequently asked questions
NanoH2O Co Ltd leads with 16 patent records, followed by Dow Global Technologies LLC with 14 and VITO (Vlaamse Instelling voor Technologisch Onderzoek) with 12, based on the 98-family corpus analysed.
Filings rose sharply from 3 records in 2017 to a peak of 21 in 2019, then moderated to a range of 9–15 per year through 2024. The 2025 and 2026 figures are subject to publication lag and should not be interpreted as a continuing decline.
The United States is the primary protection market, followed by South Korea, Europe (EPO), India, and China. Israel also appears with 8 records, reflecting IDE Water Technologies’ home-market activity.
B01D (Separation processes, including filtration) is the largest class, followed by C02F (Water and wastewater treatment). Together they account for the vast majority of IPC assignments in the corpus.
Cross-applicant collaboration is rare. The only co-filing relationship identified is a single joint application between The Research Foundation for the State University of New York and Cleveland State University Research Corp.
C25B (Electrolytic production of compounds) and E21B (Earth and rock drilling / wells) each appear at low frequency — 8 and 6 patent records respectively — relative to the dominant membrane-separation core, making them the most accessible adjacent areas for new IP development.
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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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