RO Desalination Control Patent Landscape 2026
The RO desalination control field is in a growth phase, with filing activity accelerating sharply in recent years and China dominating both filings and jurisdictional coverage. Desalitech leads the applicant ranking, but the top five filers hold only 22% of the hundred largest filers’ combined output, signalling a fragmented, multi-player competitive environment.
Desalitech leads a fragmented field with no dominant bloc
Desalitech holds the top position with 14 patent records, followed by Gree Electric Appliances (Zhuhai) with 13 and Culligan International with 10. No single entity commands a decisive share, placing the field in a genuinely distributed competitive structure.
The top five filers collectively account for 22% of the hundred largest filers’ combined total — a modest concentration figure that indicates the second and third tiers are meaningfully active. The gap between leader and challenger is narrow (14 vs. 13 patent records), reinforcing the absence of an entrenched dominant bloc.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Desalitech Ltd. | 14 | |
| 2 | Gree Electric Appliances, Inc. of Zhuhai | 13 | |
| 3 | Culligan International Company | 10 | |
| 4 | Rockwater Resource LLC | 7 | |
| 5 | Haier Smart Home Co., Ltd. | 7 | |
| 6 | Foshan Shunde Midea Water Dispenser Manufacturing Co., Ltd. | 6 | |
| 7 | Midea Group Co., Ltd. | 6 | |
| 8 | Qingdao Haier Strauss Water Equipment Co., Ltd. | 6 | |
| 9 | Aqua Research LLC | 5 | |
| 10 | DOOSAN HEAVY IND & CONSTR CO LTD | 5 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Hatch Ltd. | 4 | |
| 12 | Guangdong Lizi Technology Co., Ltd. | 4 | |
| 13 | MIOX Corporation | 4 | |
| 14 | Ionics, Inc. | 4 | |
| 15 | Ebara Corporation | 3 | |
| 16 | Shanghai Jiaoying Energy Technology Co., Ltd. | 3 | |
| 17 | Purdue Research Foundation | 3 | |
| 18 | General Electric Company | 3 | |
| 19 | Zhejiang Supor Kitchen & Bath Appliances Co., Ltd. | 3 | |
| 20 | Vetco Gray Scandinavia | 3 |
The positions of Chinese consumer-appliance groups — Gree, Haier Smart Home, Midea, and associated subsidiaries — alongside specialized water-treatment firms such as Desalitech and Culligan suggest two distinct competitive communities: residential point-of-use players and industrial/utility-scale system developers.
The most recent 18–24 months of data are subject to publication lag and will undercount actual filings; treat 2025–2026 figures as provisional minimums rather than final totals. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Accelerating filings concentrated in water treatment and separation
The annual trend and technology-composition charts together reveal a field moving from slow baseline activity into rapid expansion, overwhelmingly anchored in water-treatment and membrane-separation classes.
Annual filing trend
Filings held in a narrow 8–10 band from 2017 to 2021, dropped to a single record in 2022 (likely a data artefact or classification gap), then surged to 24 in 2023, 30 in 2024, and 48 in 2025. The 2025 and 2026 bars are understated due to publication lag and should be read as lower bounds, not trend reversals.
↗ 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 large majority of classified records, confirming that membrane and process-chemistry innovation is the core of the field. G05B (control and regulating systems) is the third-ranked class, reflecting dedicated automation and control work; all other classes appear at low single-digit counts, including mechanical sub-systems such as F04B pumps and digital-processing branches such as G06F.
↗ 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.
Energy-saving seawater desalination device using p…
An energy-saving seawater desalination device using power generated in complementary cooperation of wind energy and light energy, and a control method are provided. The device comprises an electrical control cabinet, a photovoltaic power generation component, a wind power generation component, an energy storage device, an electric heater, etc. The present… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Water purification process | 208 |
| 2 | Water purifier | 169 |
| 3 | Water purifier | 154 |
| 4 | Mobile station and methods for diagnosing and mode… | 148 |
| 5 | Flow control module for RO water treatment system | 137 |
| 6 | Apparatus and method for continuous depyrogenation… | 130 |
| 7 | Apparatus and method for continuous depyrogenation… | 107 |
| 8 | Under the counter water treatment system | 80 |
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 structure means for R&D investment decisions
Four structural readings — maturity, concentration, collaboration, and geography — frame where new entrants can differentiate and where incumbents are consolidating.
Growth stage: annual filings still rising
The lifecycle evidence classifies this field as Growth, with annual filings still rising and a 112% increase recorded over the recent measurement window. The acceleration from 2023 onward indicates that the field has not yet passed its peak. Early movers who establish broad claim scope now are likely to define the freedom-to-operate boundaries that later entrants must design around.
Growth stageFragmented: top five hold only 22% of the largest filers’ total
With 22% top-five share among the hundred largest filers and a one-record gap between the leader and the second-ranked applicant, no incumbent has locked in a dominant position. This fragmentation means new entrants face a landscape of scattered blocking positions rather than a single fortress, but it also means no obvious licensing anchor exists for cross-licensing deals.
FragmentedCo-filing concentrated within corporate families
The most active co-filing pairs are Haier Smart Home with Qingdao Haier Strauss Water Equipment (6 joint records) and Midea Group with Foshan Shunde Midea Water Dispenser Manufacturing (6 joint records). A third Haier–Qingdao Haier Strauss Technology pair adds 2 more. Co-filing activity is essentially intra-group coordination rather than cross-industry alliance, leaving inter-sector collaboration — for example between control-system specialists and membrane manufacturers — largely unexplored.
Intra-group co-filingChina dominant; US and PCT channels secondary
China accounts for 138 patent records, the United States for 49, WIPO PCT for 17, and South Korea for 15. Australia (14) and Europe via EPO (9) round out the top six jurisdictions. The heavy China weighting reflects both domestic consumer-appliance filers and the country’s large desalination project pipeline. For applicants targeting US and European infrastructure projects, both jurisdictions remain relatively less contested.
China-ledGo 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 |
|---|---|---|
| Haier Smart Home Co., Ltd. | Qingdao Haier Strauss Water Equipment Co., Ltd. | 6 |
| Midea Group Co., Ltd. | Foshan Shunde Midea Water Dispenser Manufacturing Co., Ltd. | 6 |
| Haier Smart Home Co., Ltd. | Qingdao Haier Strauss Technology Co., Ltd. | 2 |
| Gree Electric Appliances, Inc. of Zhuhai | Shijiazhuang Gree Electric Appliances Small Appliances Co., Ltd. | 1 |
| Qingdao Haier Strauss Water Equipment Co., Ltd. | Qingdao Haier Strauss Technology Co., Ltd. | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Desalitech and Gree lead distinct competitive communities
The two top-ranked applicants represent different market segments and technology emphases, illustrating the field’s bifurcation between utility-scale RO system control and residential appliance-embedded control.
Desalitech
Desalitech holds the top position with 14 patent records, focused on utility and industrial-scale RO system optimization and control. No momentum trend is separately reported for Desalitech in the evidence, so trajectory is evidence pending. Their position as the sole leader above the tightly bunched second tier suggests established depth in process-level control methods.
patent records: 14Gree Electric Appliances (Zhuhai)
Gree Electric Appliances (Zhuhai) is ranked second with 13 patent records, with technology emphasis spanning C02F water treatment (13 records), B01D separation processes (5 records), and C02F 103 water treatment applications (5 records). The applicant momentum data flags Gree as a new entrant in the recent filing window, with 6 recent records — indicating that its current ranking reflects a rapid, concentrated entry rather than a long filing history.
patent records: 13| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Gree Electric Appliances, Inc. of Zhuhai | 6 | ▲ new entrant |
| Haier Smart Home Co., Ltd. | 5 | ▲ new entrant |
| Qingdao Haier Strauss Water Equipment Co., Ltd. | 5 | ▲ new entrant |
Under-served branches adjacent to the RO control core
Several IPC classes appear at low single-digit counts relative to the dominant C02F and B01D classes, suggesting areas where technical coverage is sparse; two stand out as having plausible connection to RO system performance.
G05D · Control of non-electric variables
G05D covers feedback and feedforward control of physical variables such as pressure, flow, and concentration — all critical parameters in RO system operation. With only 6 patent records classified here against 60 in the broader G05B control class, dedicated non-electric variable control for RO remains thinly covered. An entrant with control-engineering depth could target this branch to complement existing membrane and chemistry patents, particularly for adaptive pressure management under variable feed-water quality.
Search this in Eureka →F04B · Positive-displacement pumps
High-pressure positive-displacement pumps are the primary energy consumer in RO systems, yet F04B holds only 7 patent records in this corpus. Pump control — including variable-speed drive integration, pressure ripple suppression, and energy-recovery coupling — is a logical extension of RO system control but appears under-served. Entry here would require pump engineering alongside membrane-system expertise, and the sparse filing count suggests limited blocking positions to navigate.
Search this in Eureka →How leaders differ by technology route
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 9 · Water & wastewater treatment | C02F 103 · Water & wastewater treatment | B01D 65 · Separation processes (filtration etc.) |
|---|---|---|---|---|---|
| Gree Electric Appliances, Inc. of Zhuhai | Strong · 13 | Moderate · 5 | Moderate · 3 | Moderate · 5 | Moderate · 3 |
| MIOX Corporation | Strong · 6 | Strong · 6 | Strong · 6 | Absent | Strong · 6 |
| Culligan International Company | Strong · 10 | Strong · 9 | Absent | Absent | Emerging · 2 |
| Arion Water | Strong · 7 | Strong · 7 | Strong · 7 | Absent | Absent |
| Foshan Shunde Midea Water Dispenser Manufacturing Co., Ltd. | Strong · 6 | Moderate · 3 | Strong · 6 | Absent | Absent |
Frequently asked questions
The corpus contains 155 patent families in scope for RO desalination control as analyzed in this landscape.
Desalitech leads the ranking with 14 patent records, one ahead of Gree Electric Appliances (Zhuhai) with 13 and Culligan International with 10.
The lifecycle evidence classifies RO desalination control as a Growth stage field. Annual filings are still rising, with a 112% increase recorded over the recent measurement window. The 2025 bar of 48 records is a provisional lower bound due to publication lag.
China leads with 138 patent records, followed by the United States (49), WIPO PCT (17), South Korea (15), Australia (14), and Europe via EPO (9). These are record-level counts; a single family can appear in multiple jurisdictions.
C02F (water and wastewater treatment) and B01D (separation processes and filtration) are by far the most represented classes. G05B (control and regulating systems) is the third-ranked class, reflecting dedicated automation work, while all other classes appear at low single-digit counts.
Co-filing activity is concentrated within corporate groups rather than across industry sectors. The most active pairs are Haier Smart Home with Qingdao Haier Strauss Water Equipment (6 joint records) and Midea Group with Foshan Shunde Midea Water Dispenser Manufacturing (6 joint records). Inter-sector collaboration between control-system specialists and membrane manufacturers is not prominently evidenced.
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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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