RO Desalination Water-Quality Monitoring Patent Landscape
The RO desalination water-quality monitoring patent space is in a growth stage, with a 260% rise in filings over the recent window and China accounting for the largest share of jurisdictional activity. A.O. Smith holds the clear lead position, while the field remains fragmented beyond the top tier, leaving multiple technology branches thinly covered.
A.O. Smith leads a fragmented, fast-growing field
A. O. Smith ranks first with 7 patent records, placing it well ahead of the next tier. Huadian Longkou Power Generation and ABB Research each hold 2 patent records, with the remainder of ranked applicants at 1 patent record apiece.
The top five filers account for 22% of the combined total across the hundred largest filers, indicating a low-concentration structure where no single entity dominates. The field is populated largely by a long tail of single-filing applicants spanning utilities, engineering firms, academic institutions, and individual inventors.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | A.O. Smith Corporation | 7 | |
| 2 | Huadian Longkou Power Generation Co., Ltd. | 2 | |
| 3 | ABB Research Ltd. | 2 | |
| 4 | Riad A. Al Samadi | 1 | |
| 5 | Sri Sivasubramaniya Nadar College of Engineering | 1 | |
| 6 | Sichuan Shuisiyuan Environmental Technology Co., Ltd. | 1 | |
| 7 | V.V.S. Kesavarao | 1 | |
| 8 | Xintai Tianyuan Drinking Water Co., Ltd. | 1 | |
| 9 | National Energy Group Science and Technology Research Institute Co., Ltd. Wuhan Branch | 1 | |
| 10 | Jiangsu Nuclear Power Corporation | 1 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | K. Karthick | 1 | |
| 12 | C. Kiritharan | 1 | |
| 13 | Dalian Maritime University | 1 | |
| 14 | Culligan International Company | 1 | |
| 15 | S. Sasikaran | 1 | |
| 16 | Zhejiang Zhongxin Digital Technology Co., Ltd. | 1 | |
| 17 | Huaneng Taiyuan Dongshan Gas Turbine Thermal Power Co., Ltd. | 1 | |
| 18 | Guangdong Power Grid Co., Ltd. Dongguan Power Supply Bureau | 1 | |
| 19 | Chandigarh University | 1 | |
| 20 | HUATIAN NANJING ENG & TECH CORP MCC | 1 |
A. O. Smith’s lead reflects a deliberate portfolio strategy spanning water treatment, material analysis, and ship auxiliary systems. Beyond that, the field’s fragmentation signals that no challenger has yet assembled a defensible position comparable to the leader’s breadth.
The most recent 18–24 months of filings are likely under-counted due to publication lag; the true recent-period activity is therefore higher than reported figures suggest. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Accelerating filings and a treatment-dominant technology mix
Two charts frame the field’s momentum and composition: annual filing volume from 2017 to 2026, and the distribution of patents across IPC technology classes.
Annual filing trend
Activity was low and sporadic from 2017 through 2022 (0–3 filings per year), then accelerated sharply in 2023–2025, with 5, 12, and 13 filings respectively. The 2026 figure of 2 reflects early-year data and publication lag, not a slowdown; the 260% recent-window growth rate confirms the underlying trajectory is upward.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C02F (Water and wastewater treatment) is the dominant class, followed by G01N (Material analysis and testing) and B01D (Separation processes including filtration). Several adjacent classes — G05D, G06N, G06Q, B63J, and B67D — appear at very low counts, pointing to thinly covered branches where monitoring logic, AI integration, and point-of-use dispensing intersect with RO systems.
↗ 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.
Electrochemical analysis device for reagentless de…
A system and method for treating water containing at least one contaminant. The system and method include a water treatment module such as a reverse osmosis unit. An electrochemical contaminant detection system is positioned in the waste water stream of the water treatment module. The contaminant detection system includes a contaminant sensor and a water… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Recycled irrigation water treatment system includi… | 18 |
| 2 | Recycled irrigation water treatment system includi… | 9 |
| 3 | Method and system for optimizing membrane cleaning… | 8 |
| 4 | Water quality monitoring device for water purifyin… | 7 |
| 5 | 一种地下水氨氮复合污染修复装置及方法 | 6 |
| 6 | Electrochemical analysis device for reagentless de… | 6 |
| 7 | Systems, compositions and methods for providing sa… | 5 |
| 8 | Recycled irrigation water treatment system with re… | 5 |
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 positioning
Four structural observations — maturity stage, concentration, collaboration patterns, and geography — shape where new entrants and incumbents should focus effort.
Growth stage with rising annual volume
Annual filings are still rising; the lifecycle evidence places this field firmly in the Growth stage, with a 260% increase recorded over the recent window and no sign of deceleration. Because publication lag understates the most recent years, the true filing pace is likely higher still. Teams entering now face a field that is establishing its dominant designs rather than defending them.
Growth stageLow concentration beyond A.O. Smith
The top five filers hold just 22% of the combined total among the hundred largest filers, and every applicant below the top two slots holds a single patent record. This dispersed structure means incumbents have not yet erected broad blocking positions, and focused filing in defined sub-areas can achieve meaningful relative coverage. The window for establishing a defensible portfolio at reasonable cost remains open.
Low concentrationNo co-applicant pairs identified in the corpus
The collaboration evidence is currently pending — no co-applicant filings appear in the dataset. This absence may reflect the early-stage and fragmented nature of the field, where organizations are filing independently rather than through joint development agreements. It also suggests that formal R&D alliances or consortium filings have not yet emerged as a structural feature of this space.
No co-filing detectedChina dominant; India and the US are secondary offices
China accounts for 27 patent records at the jurisdictional level, with the United States at 12 and India at 11. Australia and Japan each appear once. This distribution reflects both the scale of Chinese water-treatment infrastructure investment and active academic filing in India. Teams seeking global freedom-to-operate should prioritize China and the US as the primary examination jurisdictions.
China-led filingGo 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.
Co-filing pairs, ranked by the number of jointly-filed patent families.
A.O. Smith leads; new entrants from Chinese power utilities
A. O. Smith holds the top position by a wide margin. The momentum data shows four new entrants in the most recent filing window, all from. China, suggesting that industrial operators are beginning to file independently rather than relying on equipment vendors.
A.O. Smith
A.O. Smith holds 7 patent records, the largest portfolio in the corpus. Its technology emphasis spans water and wastewater treatment (C02F), material analysis and testing (G01N), and ship auxiliary systems (B63J), indicating a cross-sector deployment strategy that extends beyond residential purification into marine applications. No momentum trend is provided for A.O. Smith in the recent-window data, suggesting its position was established over a broader historical period.
7 patent recordsHuadian Longkou Power Generation
Huadian Longkou Power Generation holds 2 patent records and is flagged as a new entrant in the most recent filing window. Its focus sits entirely within B01D separation processes, reflecting an industrial power-plant context where RO membrane management and water-quality monitoring are operationally critical. The new-entrant designation signals a deliberate IP build-out rather than incidental filing.
2 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Huadian Longkou Power Generation Co., Ltd. | 2 | ▲ new entrant |
| Shaanxi Ande Technology Industrial Co., Ltd. | 1 | ▲ new entrant |
| Xi’an Thermal Power Research Institute Co., Ltd. | 1 | ▲ new entrant |
| Suzhou Hanhai Intelligent Control Technology Co., Ltd. | 1 | ▲ new entrant |
Under-served branches adjacent to the dominant treatment core
Several IPC classes appear at very low counts relative to the dominant C02F and G01N branches. These represent areas of relative sparsity that may carry technical value for teams working at the intersection of RO monitoring and adjacent system layers.
G06N · AI-based computing models
G06N holds just 2 patent records in the corpus, representing 2% of IPC-level activity. Given that AI-driven anomaly detection and predictive membrane-fouling models are technically plausible extensions of water-quality monitoring, this branch is under-served relative to its potential role. An entry path exists through combining existing G01N sensing disclosures with machine-learning inference layers, areas where the current prior art is thin enough to support differentiated claims.
Search this in Eureka →G05D · Control of non-electric variables
G05D appears only twice in the corpus, despite closed-loop control of permeate quality, pressure, and pH being central to operational RO system performance. This sparsity is notable because control logic sits directly in the value chain between sensor data (G01N) and membrane management (B01D). Teams with existing process-control expertise could file here with relatively limited freedom-to-operate risk, provided they link monitoring outputs to actuation decisions in the claims.
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 | C02F 9 · Water & wastewater treatment | G01N 33 · Material analysis & testing | B01D 61 · Separation processes (filtration etc.) | C02F 103 · Water & wastewater treatment |
|---|---|---|---|---|---|
| A.O. Smith Corporation | Strong · 7 | Moderate · 2 | Strong · 4 | Absent | Moderate · 2 |
| Huadian Longkou Power Generation Co., Ltd. | Strong · 2 | Strong · 2 | Absent | Strong · 2 | Strong · 2 |
| ABB Research Ltd. | Strong · 3 | Absent | Absent | Absent | Absent |
| A. Nandhakumar | Strong · 1 | Absent | Strong · 1 | Strong · 1 | Absent |
| C. Kiritharan | Strong · 1 | Absent | Strong · 1 | Strong · 1 | Absent |
| Riad A. Al Samadi | Strong · 1 | Absent | Absent | Strong · 1 | Absent |
Frequently asked questions
The evidence covers 42 patent families in scope globally. This is a relatively small corpus, reflecting either the early-stage nature of the field or the specificity of the monitoring sub-domain within the broader RO desalination space.
A.O. Smith leads with 7 patent records, well ahead of the next-ranked applicants Huadian Longkou Power Generation and ABB Research Ltd, which each hold 2 patent records.
China accounts for 27 patent records at the jurisdictional level, making it the dominant office. The United States follows with 12 and India with 11. Australia and Japan each appear once.
The field is assessed as being in a Growth stage. Annual filings have risen sharply from low single digits before 2023 to 5, 12, and 13 in 2023, 2024, and 2025 respectively, representing 260% growth over the recent window. The 2026 figure is understated due to publication lag.
C02F (Water and wastewater treatment) dominates with 47 patent records at the IPC level, followed by G01N (Material analysis and testing) at 21 and B01D (Separation processes) at 18. The most thinly covered adjacent branches include G05D (Control of non-electric variables) and G06N (AI-based computing models), each with only 2 patent records.
No co-applicant filing pairs are identified in the current evidence. The field appears to be composed entirely of independent filings, with no consortium or joint-development patent activity detected at this time.
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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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