RO Techno-Economic Patent Landscape 2026
The reverse-osmosis techno-economic patent field is in a Growth stage: the recent three-year window sits well above the prior three-year window, with the United States as the dominant filing jurisdiction. Activity is moderately concentrated, with Garfield International Investments leading by volume and an active co-filing partnership between Trustees of Tufts College and Zwitterco Inc. emerging as the field’s most prominent collaborative axis.
Garfield International Investments leads a moderately concentrated field
Garfield International Investments holds the top position in the applicant ranking, followed by University of South Carolina and a tie between Zwitterco Inc. and Trustees of Tufts College. The top five filers account for 32% of the combined output of the hundred largest filers, indicating moderate rather than extreme concentration.
A visible tier gap separates the top two applicants — Garfield International Investments and University of South Carolina — from the rest of the ranked field. Below those two, activity disperses across a broad mix of universities, start-ups, and industrial players, none commanding a dominant position on its own.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Garfield International Investments Ltd. | 27 | |
| 2 | University of South Carolina | 23 | |
| 3 | Zwitterco Inc. | 15 | |
| 4 | Trustees of Tufts College | 15 | |
| 5 | Nanyang Technological University | 10 | |
| 6 | The Boeing Company | 10 | |
| 7 | EET Corp. | 8 | |
| 8 | Aquatech International LLC | 8 | |
| 9 | Tritech Water Technologies Pte Ltd. | 7 | |
| 10 | ABB Research Ltd. | 6 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Riad A. Al Samadi | 5 | |
| 12 | Bio-Lab Inc. | 5 | |
| 13 | Purdue Research Foundation | 5 | |
| 14 | Shenzhen Boru Environmental Technology Co. Ltd. | 5 | |
| 15 | University of Connecticut | 5 | |
| 16 | Resolute Marine Energy Inc. | 4 | |
| 17 | Istanbul Technical University | 4 | |
| 18 | Saehan Industries Co. Ltd. | 4 | |
| 19 | Masar Technologies Inc. | 4 | |
| 20 | Board of Regents, The University of Texas System | 4 |
The positions of Garfield International Investments and University of South Carolina imply sustained, multi-year commitment to RO process and membrane technology, giving them citation depth and prior-art breadth that later entrants will need to design around. The emergence of Zwitterco Inc. and Trustees of Tufts College as new entrants with identical recent-period counts signals an incoming challenge to that incumbency.
The most recent 18–24 months of filing data are subject to publication lag and will appear under-counted until applications clear examination; figures for 2025–2026 should be interpreted as partial. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Multi-year growth driven by separation and water-treatment classes, with a 2023 activity spike
The filing trend and technology composition charts together show where and how RO techno-economic innovation has accelerated, and which IPC branches dominate versus which remain sparsely populated.
Annual filing trend
Annual filings rose from 8 records in 2017 to a peak of 24 in 2023, then eased to 10 in 2024 and 8 in 2025 — consistent with the Growth lifecycle stage where multi-year volume is up 38% but annual output has moderated from the 2023 peak. The 2025–2026 bars are further understated by publication lag and should not be read as a real decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
B01D (separation processes including filtration) and C02F (water and wastewater treatment) together account for the large majority of classified records, confirming the field’s core in membrane separation and process engineering. All other IPC classes each represent a small fraction of activity, with polymer chemistry (C08F) and catalysis/process chemistry (B01J) as the most populated adjacent branches.
↗ 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.
Seawater desalination system implementing reverse …
Disclosed is a seawater desalination system implementing reverse osmosis. The seawater desalination system comprises: one or more pumps for pressurizing seawater to provide pressurized seawater; one or more reverse-osmosis membranes for discharging fresh water and concentrate water from the pressurized seawater; one or more pressure-regulating devices… (excerpt from the patent abstract)
Open this patent in Eureka →| # | Patent | Citations |
|---|---|---|
| 1 | Water treatment process for membranes | 324 |
| 2 | Water desalination process and apparatus | 195 |
| 3 | Reducing aqueous boron concentrations with reverse… | 172 |
| 4 | Permeable membranes having high flux-density and l… | 166 |
| 5 | Production of purified water and high value chemic… | 132 |
| 6 | Production of purified water and high value chemic… | 126 |
| 7 | Membrane cleaning process | 100 |
| 8 | Integrated electro-pressure membrane deionization … | 93 |
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 field structure means for R&D investment decisions
Four structural features — lifecycle stage, concentration pattern, collaboration ecosystem, and geographic reach — collectively define where risk and opportunity sit for a new or existing participant in RO techno-economic technology.
Growth stage, past its 2023 activity peak on an annual basis
The field is classified as Growth: the recent three-year filing window sits 38% above the prior three-year window, confirming genuine multi-year expansion. Annual volume peaked in 2023 at 24 records and has eased since, though publication lag means 2024–2025 figures are still incomplete. For R&D teams, this suggests a window where claim space is not yet fully occupied but competitive pressure is building.
Lifecycle: GrowthModerate concentration with a clear two-player lead tier
The top five filers hold 32% of the combined output of the hundred largest filers, a moderate share that indicates no single entity has locked up the field. A two-player lead tier — Garfield International Investments and University of South Carolina — is separated from the pack, but the remaining ranked applicants are closely bunched, leaving room for focused entrants to establish defensible positions in adjacent sub-domains.
Top-5 share: 32%Tufts College and Zwitterco Inc. form the field’s only documented co-filing pair
The sole confirmed co-applicant relationship in the evidence is between Trustees of Tufts College and Zwitterco Inc., which jointly filed 15 patent records — matching each party’s individual ranked total and indicating their entire recent portfolio is co-owned. This university–start-up pairing, focused on membrane polymer chemistry (B01D 71 and C08F 265), represents a tightly integrated technology transfer channel rather than a broad open-innovation network.
Co-filer pair: Tufts / ZwittercoUS-anchored filing with broad international validation via PCT and EPO
The United States is the leading filing jurisdiction, followed by WIPO PCT and Europe (EPO), indicating that lead applicants are pursuing international protection rather than limiting exposure to a single market. Substantial filing activity in India and China also points to commercially strategic coverage of high-growth water-stress regions. Singapore and Israel appear as secondary hubs, consistent with their roles as water-technology innovation centers.
Lead office: United StatesGo 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 |
|---|---|---|
| Trustees of Tufts College | Zwitterco Inc. | 15 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Garfield International Investments and University of South Carolina lead; Tufts/Zwitterco emerge as a unified new entrant
The top two ranked applicants reflect contrasting profiles — a private investment-linked entity with a process-and-maintenance emphasis versus a research university with a separation-science focus — while the Tufts–Zwitterco partnership enters as a single coordinated bloc targeting advanced membrane polymer design.
Garfield International Investments
Garfield International Investments leads the ranking with 27 patent records. Its technology emphasis spans water and wastewater treatment (C02F 1), membrane separation processes (B01D 61), and membrane maintenance (B01D 65), indicating a broad systems-level position covering both RO process design and membrane operational economics. No momentum data was available for this applicant in the evidence.
Records: 27Trustees of Tufts College & Zwitterco Inc.
Trustees of Tufts College and Zwitterco Inc. each hold 15 patent records and are classified as new entrants, meaning all of their counted activity falls in the recent period. Their shared technology focus on membrane polymer chemistry (B01D 71 and C08F 265 — zwitterionic addition polymers) is narrower than incumbents’ but technically differentiated, targeting antifouling membrane materials rather than process-level optimization.
Records: 15 each| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Trustees of Tufts College | 15 | ▲ new entrant |
| Zwitterco Inc. | 15 | ▲ new entrant |
Under-served branches adjacent to the dominant separation and water-treatment core
Several IPC classes appear at low counts relative to the B01D and C02F core, representing areas where prior art is sparse. These are observations of relative sparsity; only those with clear technical relevance and a realistic entry path are highlighted as warranting closer attention.
C08F · Addition polymers (vinyl/zwitterionic chemistry)
With 15 patent records, C08F is the largest of the sparse adjacent branches and is technically adjacent to the dominant membrane separation core. Zwitterionic polymer membranes with tunable antifouling properties represent a plausible entry vector; the Tufts–Zwitterco co-filing cluster already occupies part of this space, but their narrow focus leaves adjacent polymer architectures relatively open. Teams with polymer synthesis capability could establish defensible positions here before the branch densifies.
Search this in Eureka →B01J · Chemical/physical processes & catalysis
B01J carries only 9 patent records in this corpus, indicating that catalytic and reactive pretreatment processes — scale inhibition, oxidative fouling control, or catalytic brine management — remain sparsely protected in the RO techno-economic context. This branch has plausible technical value because pretreatment chemistry directly affects RO system economics (energy, membrane replacement, brine disposal). The sparse prior art suggests a realistic entry path for applicants combining catalysis expertise with RO process knowledge.
Search this in Eureka →How leading applicants 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 | C02F 9 · Water & wastewater treatment | B01D 65 · Separation processes (filtration etc.) | C02F 103 · Water & wastewater treatment |
|---|---|---|---|---|---|
| Garfield International Investments Ltd. | Strong · 19 | Strong · 21 | Absent | Strong · 18 | Absent |
| University of South Carolina | Strong · 26 | Moderate · 13 | Moderate · 11 | Absent | Absent |
| Nanyang Technological University | Strong · 12 | Strong · 11 | Absent | Moderate · 4 | Moderate · 4 |
| Aquatech International LLC | Strong · 5 | Strong · 7 | Absent | Strong · 7 | Absent |
| ABB Research Ltd. | Strong · 8 | Strong · 6 | Absent | Moderate · 2 | Absent |
| Masar Technologies Inc. | Strong · 4 | Strong · 4 | Absent | Absent | Strong · 4 |
| EET Corp. | Strong · 8 | Absent | Absent | Absent | Absent |
Frequently asked questions
The corpus covers 97 patent families in scope. This total forms the basis for lifecycle and trend analysis; applicant rankings are reported in patent records, which can differ because a family may have multiple national filings.
Garfield International Investments leads the ranking with 27 patent records. University of South Carolina follows with 23 records, and Zwitterco Inc. and Trustees of Tufts College each hold 15 records.
The field is classified as Growth. Recent three-year filing volume is 38% above the prior three-year window. Annual filings peaked in 2023 at 24 records and have eased since, but the most recent years are understated by publication lag, so the moderation should not be read as a real decline.
The United States is the leading jurisdiction, followed by WIPO PCT and Europe (EPO). India and China also show substantial filing activity, consistent with strategic coverage of water-stressed, high-growth markets. Singapore and Israel appear as secondary hubs.
Trustees of Tufts College and Zwitterco Inc. co-filed all 15 of their jointly held patent records, making them the sole documented co-applicant pair in the corpus. Their shared focus on zwitterionic polymer membranes (B01D 71 and C08F 265) represents a university–start-up technology transfer model targeting antifouling membrane materials, technically distinct from the process-level emphasis of leading incumbents.
The two most prominent under-served adjacent branches are C08F (addition polymers, 15 records) and B01J (chemical/physical processes and catalysis, 9 records). C08F is being entered by the Tufts–Zwitterco pair but remains largely open beyond their narrow zwitterionic focus. B01J, covering catalytic pretreatment and reactive brine management, has the fewest records relative to its technical relevance to RO system economics.
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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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