RO Energy & Cost Reduction Patent Landscape 2026
The RO energy and cost reduction patent field spans 486 patent families and is led by a small cluster of specialist water-technology firms, with Fluid Equipment Development Company LLC holding the largest position. Activity peaked around 2017 and has since eased on an annual basis, signalling a maturing field where differentiated technical positioning matters more than volume.
Fluid Equipment Development Company LLC leads a moderately concentrated field
Fluid Equipment Development Company LLC ranks first among all filers, followed by Water Standard Co LLC and Veolia Water Solutions & Technologies Support SAS. The top five filers together account for 25% of the combined output of the hundred largest filers, indicating a moderate but not extreme concentration at the top.
The tier gap between the leader (50 patent records) and the fifth-ranked Toray Industries Inc (32 patent records) is meaningful but not insurmountable, suggesting that second-tier challengers retain the capacity to close the gap through focused filing campaigns.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Fluid Equipment Development Company LLC | 50 | |
| 2 | Water Standard Co LLC | 39 | |
| 3 | VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT SAS | 34 | |
| 4 | Hitachi Ltd | 33 | |
| 5 | Toray Industries Inc | 32 | |
| 6 | Battelle Memorial Institute | 28 | |
| 7 | Organo Corporation | 22 | |
| 8 | Garfield International Investments Ltd | 22 | |
| 9 | Purdue Research Foundation | 19 | |
| 10 | Nanyang Technological University | 17 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Ebara Corporation | 17 | |
| 12 | TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATI… | 17 | |
| 13 | City of Long Beach | 15 | |
| 14 | Fluence Water Israel Ltd | 14 | |
| 15 | IDE Water Technologies Ltd | 13 | |
| 16 | Synauta Inc | 13 | |
| 17 | IDE Technologies Ltd | 13 | |
| 18 | Kurita Water Industries Ltd | 12 | |
| 19 | ABB (Switzerland) AG | 12 | |
| 20 | University of South Carolina | 11 |
The leaders’ emphasis on separation processes (B01D) and water/wastewater treatment (C02F) reflects a core focus on membrane and system-level efficiency rather than upstream pump hardware or energy-recovery machinery, leaving adjacent mechanical sub-classes comparatively open.
Filing counts for 2025 and 2026 are expected to be materially under-counted due to the standard 18–24 month patent publication lag and should not be read as a sustained decline. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Annual volume has eased from its 2017 peak; water-treatment and separation classes dominate the mix
Two views of the corpus reveal a field that expanded strongly through 2017 before moderating, with a technology mix heavily anchored in water treatment and membrane separation and a long tail of mechanical and industrial sub-classes.
Annual filing trend
Filings peaked at 73 patent families in both 2017 and 2018 before stepping down. A partial recovery to 53 families was recorded in 2024, but the multi-year trajectory is flat-to-declining. The 2025 and 2026 bars are incomplete due to publication lag and should not be read as a real-time signal.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C02F (water and wastewater treatment) and B01D (separation processes including filtration) together account for the overwhelming majority of IPC records, confirming that system-level membrane efficiency is the dominant innovation axis. Mechanical sub-classes such as F04B (positive-displacement pumps), F03G, and F03B each represent only low single-digit shares, pointing to under-served areas in the hardware stack.
↗ 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.
Reverse osmosis treatment system for recovering en…
Provided is a reverse osmosis treatment system capable of simultaneously and efficiently recovering energy generated both at brine and permeate sides. The system comprises a branched portion configured to divide second to-be-treated water into third and fourth to-be-treated water; a high-pressure pump configured to pressurize the third to-be-treated water… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Water treatment process for membranes | 324 |
| 2 | Method and apparatus for high efficiency reverse o… | 244 |
| 3 | Method and apparatus for high efficiency reverse o… | 229 |
| 4 | Desalination method and apparatus utilizing nanofi… | 191 |
| 5 | Reducing aqueous boron concentrations with reverse… | 172 |
| 6 | Apparatus and method for multistage reverse osmosi… | 169 |
| 7 | Method of recovering energy from reverse osmosis w… | 164 |
| 8 | Production of purified water and high value chemic… | 132 |
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
The combination of a past-peak filing curve, moderate concentration, sparse mechanical sub-classes, and a US-centric jurisdiction map shapes where new entrants can most efficiently deploy R&D resources.
Field is in decline phase — annual volume has eased from the 2017 peak
The lifecycle stage is classified as Decline, with annual filings retreating from the 2017 high of 73 patent families. On a multi-year basis the corpus still represents a substantial body of prior art, meaning that genuinely novel contributions must clear a high inventive-step bar. New entrants should audit the citation landscape carefully before committing to incremental improvements in already-dense sub-classes.
Past-peak · Decline stageModerate top-tier concentration with an accessible challenger tier
The top five filers hold 25% of the combined output of the hundred largest filers, which is moderate rather than entrenched. The gap between the leader (50 patent records) and the fifth-place holder (32 patent records) is narrow enough that a targeted two-to-three-year filing program could shift relative positions. The remaining top-20 applicants are spread across a wide range of entity types — industrial firms, research institutes, and utilities — reducing the risk of any single player locking up a sub-field.
Moderate concentrationCo-filing activity is sparse; Ebara Research and ABB (Switzerland) are the most active co-filers
Evidence shows a single recorded co-filing pair: Ebara Research Ltd and ABB (Switzerland) AG, with four joint filings. This very low collaboration density suggests that most participants treat RO energy efficiency as a proprietary competitive advantage rather than a shared pre-competitive platform. Organizations seeking to accelerate development through partnership will find limited established consortium infrastructure and may need to initiate bilateral agreements.
Low collaboration densityUS leads filings; China and Europe are material secondary markets
The United States is the primary filing jurisdiction, followed by China and Europe (EPO). WIPO (PCT) and Australia represent significant secondary routes, consistent with large desalination project pipelines in the Middle East and Asia-Pacific. India, Israel, and Singapore also appear, reflecting water-stress-driven demand. Organizations prioritizing the Gulf and Southeast Asian markets should review their PCT and national-phase coverage in those regions.
US-centric, global footprintGo 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 |
|---|---|---|
| Ebara Research Ltd | ABB (Switzerland) AG | 4 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Specialist water-tech firms dominate; Japanese industrials hold strong positions
The top two filers are US-based specialist water-technology companies with deep expertise in membrane separation and system optimization; Japanese and French multinationals round out the top five, bringing broader industrial manufacturing capability.
Fluid Equipment Development Company LLC
The clear corpus leader with 50 patent records, concentrated heavily in B01D 61 (separation processes) and C02F 1 (water and wastewater treatment). This focus on membrane-system integration — rather than pump hardware — is consistent with the company’s engineering identity in high-efficiency RO system design. No momentum trend data is available for this applicant in the evidence set.
patent records: 50Battelle Memorial Institute
Ranked sixth with 28 patent records, Battelle’s portfolio is anchored in B01D 61 (separation processes) with a secondary emphasis on multi-step water treatment (C02F 9). Momentum data flags Battelle as a new entrant in the recent filing window, with 5 recent filings, suggesting an active and accelerating research program despite starting from a modest base. Its research-institute positioning may support cross-sector technology transfer into adjacent industrial water applications.
patent records: 28| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Battelle Memorial Institute | 5 | ▲ new entrant |
| Organo Corporation | 2 | ▲ new entrant |
Under-served mechanical and hydraulic sub-classes adjacent to the dominant membrane core
While membrane separation and water treatment sub-classes dominate the corpus, several mechanical and hydraulic IPC branches remain comparatively sparse and sit at technically plausible interfaces with RO energy recovery.
F04B · Positive-displacement pumps
This branch holds 46 patent records — a low share relative to the dominant membrane classes — despite positive-displacement pump design being central to high-pressure RO feed and energy-recovery device efficiency. The sparsity suggests that pump-level optimization for RO-specific duty cycles (variable salinity, pressure pulsation, isobaric exchange) is an area where focused IP development could differentiate a hardware supplier or system integrator. Realistic entry paths include design-around filings on impeller geometry, pressure-exchanger coupling, and variable-speed drive integration.
Search this in Eureka →F03B · Hydraulic machines & engines
With 29 patent records, F03B (hydraulic machines and engines) represents one of the thinnest mechanical sub-classes in the corpus, despite hydraulic turbine and pressure-exchanger technology being a direct enabler of brine energy recovery in large-scale SWRO plants. The low count may reflect that brine-turbine IP has historically been claimed under the dominant C02F or B01D umbrella rather than the machinery class, but it also points to a potential gap in hardware-specific claims. Entrants with turbomachinery expertise could file defensively in this branch to complement system-level membrane portfolios.
Search this in Eureka →How leading filers differ by technology sub-class emphasis
Route coverage across the main technology branches in the current evidence set.
| Player | C02F 1 · Water & wastewater treatment | B01D 61 · Separation processes (filtration etc.) | C02F 103 · Water & wastewater treatment | C02F 9 · Water & wastewater treatment | B01D 65 · Separation processes (filtration etc.) |
|---|---|---|---|---|---|
| Water Standard Co LLC | Strong · 39 | Strong · 38 | Absent | Strong · 34 | Absent |
| Fluid Equipment Development Company LLC | Strong · 29 | Strong · 49 | Moderate · 10 | Absent | Absent |
| Toray Industries Inc | Strong · 29 | Strong · 31 | Absent | Absent | Strong · 19 |
| Veolia Water Solutions & Technologies Support SAS | Strong · 32 | Strong · 33 | Moderate · 7 | Absent | Emerging · 5 |
| Hitachi Ltd | Strong · 30 | Strong · 30 | Absent | Absent | Absent |
| Organo Corporation | Strong · 22 | Strong · 19 | Absent | Moderate · 11 | Moderate · 6 |
Frequently asked questions
The corpus used for this analysis contains 486 patent families, spanning global filings primarily in the United States, China, Europe (EPO), and via WIPO PCT applications.
Fluid Equipment Development Company LLC leads with 50 patent records, ahead of Water Standard Co LLC (39) and Veolia Water Solutions & Technologies Support SAS (34).
No. The lifecycle stage is classified as Decline. Annual filings peaked at 73 families in 2017 and 2018 and have eased since. The most recent years (2025, 2026) are materially under-counted due to patent publication lag and should not be treated as a reliable current signal.
C02F (water and wastewater treatment) and B01D (separation processes, including filtration and membrane technology) dominate the IPC distribution by a wide margin, reflecting a field centered on membrane system efficiency rather than mechanical hardware.
The United States is the leading jurisdiction, followed by China and Europe (EPO). Australia, India, Israel, and Singapore are also notable secondary markets, reflecting desalination demand in water-stressed regions.
Recorded co-filing activity is very limited. The only identified co-filing pair in the evidence is Ebara Research Ltd and ABB (Switzerland) AG, with four joint filings, indicating that the field operates largely through proprietary rather than collaborative R&D.
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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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