RO Energy Efficiency Patent Landscape 2026
Fluid Equipment Development Company LLC holds a commanding lead in RO energy efficiency patenting, and the field has eased back from its 2018 peak on a multi-year basis. Activity is concentrated among a small group of water-technology specialists and industrial conglomerates, with the United States as the dominant filing jurisdiction.
Fluid Equipment Development Company leads a moderately concentrated field
Fluid Equipment Development Company LLC sits at the top of the applicant ranking with 104 patent records, nearly double the count of the second-ranked Ebara Corp at 51. The top five filers—Fluid Equipment Development Company LLC, Ebara Corp, Hitachi Ltd, Veolia Water Solutions & Technologies Support SAS, and IDE Water Tech Ltd—together account for 29% of the combined total across the hundred largest filers.
That 29% top-five share indicates moderate, not extreme, concentration: a single dominant player exists, but a dense second tier of water-treatment specialists, Japanese industrial groups, and research institutes competes actively within roughly 20–55 patent records each.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Fluid Equipment Development Company LLC | 104 | |
| 2 | Ebara Corporation | 51 | |
| 3 | Hitachi Ltd | 48 | |
| 4 | VEOLIA WATER SOLUTIONS & TECHNOLOGIES SUPPORT SAS | 46 | |
| 5 | IDE Water Technologies Ltd | 45 | |
| 6 | Water Standard Co LLC | 41 | |
| 7 | Toray Industries Inc | 34 | |
| 8 | Battelle Memorial Institute | 29 | |
| 9 | Desalitech | 28 | |
| 10 | General Electric Co | 27 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Nanyang Technological University | 18 | |
| 12 | IDE Technologies Ltd | 18 | |
| 13 | Gradiant Corporation | 17 | |
| 14 | Kurita Water Industries Ltd | 17 | |
| 15 | City of Long Beach | 16 | |
| 16 | Oneka Technologies | 16 | |
| 17 | Mitsubishi Heavy Industries Ltd | 16 | |
| 18 | Porifera Inc | 16 | |
| 19 | Clean H2O Technologies LLC | 12 | |
| 20 | BL Technology Inc | 12 |
Fluid Equipment Development Company LLC’s position reflects deep specialization in positive-displacement pump and membrane-separation architectures central to energy recovery in RO systems. Challengers such as Ebara Corp, Hitachi Ltd, and Veolia hold broadly similar technology profiles, signaling that incremental differentiation on system integration and process optimization is the main competitive axis.
Filing counts for 2024–2026 are subject to publication lag and will rise as pending applications are published; apparent softness in those years should not be read as a confirmed contraction. 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 2018 peak; membrane separation dominates the technology mix
The filing trend chart tracks annual activity from 2017 onward, while the technology-composition chart reveals which IPC branches claim the largest share of the corpus. Together they show a maturing field whose core innovation axes are well-established.
Annual filing trend
Annual filings peaked at 97 records in 2018 and have eased materially since, consistent with a field entering a decline stage. The apparent troughs in 2022–2023 and low 2025–2026 counts reflect both genuine volume reduction and publication lag for recently filed applications; the latter years should be treated as under-counted pending further publication.
↗ Hover for values · click a bar to ask EurekaTechnology composition
B01D (separation processes, including membrane filtration) and C02F (water and wastewater treatment) together account for the overwhelming majority of classified records, confirming that membrane-process engineering is the core innovation domain. F04B (positive-displacement pumps) is the third-ranked branch and the most active adjacent hardware class, pointing to energy-recovery device design as a secondary focus. Branches such as F03B (hydraulic machines), F03G (miscellaneous motors), and B01J (chemical/physical processes) are present but sparse, marking them as lower-activity adjacent areas.
↗ 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.
Membrane seawater desalination pressurization and …
A membrane seawater desalination pressurization and energy recovery integrated method. Piston rods of single-rod piston-type seawater cylinders are connected with single-rod piston-type hydraulic cylinders to form two or more than two working combined bodies which operate alternately. In a process that the hydraulic cylinders drive the seawater cylinders to… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Maritime power plant system with processes for pro… | 360 |
| 2 | Desalination method and apparatus utilizing nanofi… | 191 |
| 3 | Apparatus and method for multistage reverse osmosi… | 169 |
| 4 | Method of recovering energy from reverse osmosis w… | 164 |
| 5 | Reverse osmosis method and apparatus | 160 |
| 6 | Reverse osmosis with free rotor booster pump | 126 |
| 7 | Rotary shaft driven reverse osmosis method and app… | 124 |
| 8 | Reverse osmosis desalination apparatus and method | 120 |
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 declining filing rate, a clear leader, and a dense challenger tier shapes where new entrants can find defensible ground and where incumbents face the most competition.
Field in decline after a 2018 peak
The lifecycle evidence classifies RO energy efficiency as in decline, with annual filings easing back from the 2018 peak of 97 records. The multi-year corpus of 599 patent families represents a substantial accumulated knowledge base, suggesting that foundational architecture claims are largely staked. New entrants should target incremental system-integration improvements or novel energy-recovery topologies rather than core membrane-separation claims.
Lifecycle: DeclineOne dominant player, dense challenger tier
Fluid Equipment Development Company LLC’s 104-record lead over second-ranked Ebara Corp at 51 creates a clear hierarchy, but the top-five share of 29% among the hundred largest filers indicates that no single player controls the field. The challenger tier—Hitachi Ltd, Veolia Water Solutions & Technologies Support SAS, IDE Water Tech Ltd, Water Standard Co LLC, and Toray Industries Inc—maintains enough volume to contest incremental innovation areas. New entrants face high overlap risk in core membrane-process claims but have more room in hardware-adjacent branches.
Concentration: ModerateLimited co-filing; GE and BL Technology the most active pair
The most active co-filing relationship is between General Electric Co and BL Technology Inc, with four jointly filed records. IDE Water Tech Ltd and IDE Technologies Ltd appear as a secondary pair with three joint records, likely reflecting a corporate family relationship rather than an independent partnership. Co-filing activity overall is sparse, suggesting that cross-organizational R&D alliances have not been a primary commercialization strategy in this space.
Collaboration: SparseUS-centric with meaningful coverage in China, Europe, and via PCT
The United States is the lead filing jurisdiction with 340 patent records, followed by China at 167, EPO at 162, and WIPO PCT at 153. Australia and Israel also show notable coverage, reflecting deployment markets for large-scale desalination. The breadth of PCT and EPO filings indicates that leading applicants seek international protection, but the US-to-China gap suggests that China-specific claims are a secondary rather than primary strategic target for most incumbents—a potential opening for China-based challengers.
Lead jurisdiction: 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 |
|---|---|---|
| General Electric Co | BL Technology Inc | 4 |
| IDE Water Technologies Ltd | IDE Technologies Ltd | 3 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Fluid Equipment Development Company leads; Battelle Memorial Institute enters as a new challenger
The top two players by momentum illustrate contrasting trajectories: the field leader is contracting sharply in recent output, while a research-institute challenger has emerged with fresh filings. Both are concentrated in the same core IPC branches, making technology differentiation a matter of depth rather than direction.
Fluid Equipment Development Company LLC
With 104 patent records, Fluid Equipment Development Company LLC holds more than twice the count of its nearest rival. Its portfolio is concentrated in B01D 61 (membrane separation processes) and C02F 1 (water treatment), with secondary coverage in C02F 103. Recent filing momentum has declined sharply (recent trend: -84% vs prior period), suggesting the company has moved past peak prosecution activity and is consolidating an established position rather than expanding its claim footprint.
patent records: 104Battelle Memorial Institute
Battelle Memorial Institute holds 29 patent records, placing it eighth in the overall ranking, with its portfolio focused on B01D 61 (membrane separation) and C02F 9 and C02F 1 (multi-stage and general water treatment). Its momentum status is listed as a new entrant in the recent window, indicating it has established a filing presence in this domain only recently. Coming from a large-scale government research base, Battelle’s entry may signal increased public-sector interest in RO efficiency for water-security applications.
patent records: 29| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Fluid Equipment Development Company LLC | 3 | ▼ -84% |
| Battelle Memorial Institute | 5 | ▲ new entrant |
Under-served adjacent branches in pump hardware and hydraulic energy recovery
Several IPC branches adjacent to the dominant membrane-separation core show relatively low patent counts, marking them as areas where the claim landscape is less crowded. These observations are based on relative sparsity within this corpus and do not constitute validated commercial opportunities without further freedom-to-operate analysis.
F03B · Hydraulic machines & engines
F03B covers turbines and hydraulic engines directly relevant to pressure-exchanger and turbocharger-style energy recovery devices—components that sit at the heart of high-efficiency RO systems. With only 35 patent records in this branch, the claim density is low relative to the B01D and C02F core. Engineers developing novel hydraulic energy-recovery architectures or variable-geometry pressure exchangers may find less crowded ground here, though a thorough freedom-to-operate search against the F04B positive-displacement pump cluster (172 records) would be a necessary first step.
Search this in Eureka →F03G · Spring/weight & miscellaneous motors
F03G (miscellaneous motors including wave and osmotic energy) contains only 29 patent records in this corpus, making it one of the sparser hardware branches. Its relevance to RO energy efficiency lies in wave-energy-powered desalination systems and osmotic pressure-driven actuators, both of which are technically plausible routes to off-grid or low-carbon RO operation. The low count reflects early-stage development rather than maturity; applicants such as Oneka Tech (16 records in the overall ranking) are among the few active in this space, suggesting limited but growing interest.
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 103 · Water & wastewater treatment | B01D 65 · Separation processes (filtration etc.) | B01D 63 · Separation processes (filtration etc.) |
|---|---|---|---|---|---|
| Fluid Equipment Development Company LLC | Strong · 102 | Strong · 69 | Emerging · 14 | Absent | Absent |
| IDE Water Technologies Ltd | Strong · 38 | Strong · 38 | Strong · 32 | Absent | Absent |
| Ebara Corporation | Strong · 50 | Strong · 44 | Emerging · 9 | Absent | Absent |
| Veolia Water Solutions & Technologies Support SAS | Strong · 46 | Strong · 38 | Emerging · 6 | Moderate · 13 | Absent |
| Hitachi Ltd | Strong · 44 | Strong · 42 | Absent | Absent | Absent |
| Water Standard Co LLC | Strong · 41 | Strong · 40 | Absent | Absent | Absent |
| Toray Industries Inc | Strong · 34 | Strong · 27 | Absent | Moderate · 12 | Absent |
Frequently asked questions
The corpus covers 599 patent families in scope globally. The United States is the lead filing jurisdiction with 340 patent records, followed by China at 167 and EPO at 162.
Fluid Equipment Development Company LLC leads with 104 patent records, nearly double the count of second-ranked Ebara Corp at 51. The top five applicants together account for 29% of the combined total across the hundred largest filers.
No. The field is classified in a decline stage, with annual filings easing back from a peak of 97 records in 2018. The most recent years (2024–2026) show low counts that also reflect publication lag and should be treated as under-counted.
B01D (separation processes, including membrane filtration) and C02F (water and wastewater treatment) account for the largest share of classified records. F04B (positive-displacement pumps) is the third-ranked branch, reflecting the importance of energy-recovery pump devices.
The United States leads at 340 patent records, followed by China at 167, EPO at 162, and WIPO PCT at 153. Australia and Israel also show notable coverage, consistent with large-scale desalination deployment markets.
F03B (hydraulic machines and engines, 35 records) and F03G (miscellaneous motors including wave energy, 29 records) are among the sparsest branches adjacent to the dominant membrane-separation core. B01F (mixing and stirring, 40 records) and B01J (chemical and physical processes, 23 records) are similarly sparse. These observations reflect relative claim density and require freedom-to-operate analysis before drawing investment conclusions.
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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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