Electrochemical Water Treatment Patent Landscape 2026
Electrochemical Water Treatment Patent Landscape in 2026
The electrochemical water treatment patent field is moderately concentrated, with Evoqua Water Technologies LLC holding a commanding lead among the hundred largest filers. Activity peaked in 2019 and has eased since, placing the field in a post-peak phase, though adjacent branches in catalysis and disinfection remain comparatively sparse.
Evoqua leads a moderately concentrated field with a clear tier gap
Evoqua Water Technologies LLC ranks first with 304 patent families, more than double the second-ranked DEKA Products LP at 149 and the third-ranked Axine Water Technologies at 131. The top five filers account for 31% of the combined total across the hundred largest applicants, signalling meaningful but not monopolistic concentration.
A distinct tier gap separates the top three from the remainder of
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 1 | Evoqua Water Technologies LLC | 304 | |
| 2 | DEKA Products LP | 149 | |
| 3 | Axine Water Technologies | 131 | |
| 4 | Industrie De Nora SpA | 65 | |
| 5 | Water Visions International Inc | 55 | |
| 6 | Konica Corporation | 51 | |
| 7 | Arvia Technology Ltd | 43 | |
| 8 | Beijing University of Technology | 42 | |
| 9 | California Institute of Technology | 38 | |
| 10 | De Nora Permelec Ltd | 32 |
| # | Applicant | Patent families | Share |
|---|---|---|---|
| 11 | Hydronovation Inc | 31 | |
| 12 | Outotec (Finland) Oy | 30 | |
| 13 | Sanyo Electric Co Ltd | 30 | |
| 14 | Powertech Water Inc | 29 | |
| 15 | TECHNION RES & DEV FOUND LTD | 29 | |
| 16 | Bioionix Inc | 28 | |
| 17 | IDE Water Technologies Ltd | 27 | |
| 18 | Hydrus Technologies | 27 | |
| 19 | Eka Chemicals AB | 27 | |
| 20 | Proterrgo Inc | 27 |
Evoqua’s position, roughly twice the nearest rival, implies substantial freedom-to-operate constraints in core C02F water treatment and B01D separation claims. Challengers such as Axine Water Technologies and DEKA Products LP have carved distinct niches — electrolytic compound production and distillation/separation respectively — that partially insulate them from direct overlap with the leader.
Filing counts for 2025 and 2026 are substantially under-represented owing to patent publication lag and should not be interpreted as a continuation of the post-2019 easing trend. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity eased from a 2019 peak; C02F dominates but adjacent branches are active
The two charts together show a field that expanded to a 2019 peak and has since contracted on an annual basis, while the technology composition reveals a dominant core in water and wastewater treatment (C02F) with meaningful secondary activity in separation processes and electrolytic compound production.
Annual filing trend
Annual filings rose from 266 in 2017 to a peak of 312 in 2019, then declined steadily to 261 in 2023 and 237 in 2024. The 2025 and 2026 figures are substantially under-counted due to publication lag and do not reflect true activity levels for those years.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C02F (water and wastewater treatment) is the dominant class by a wide margin, reflecting the direct application focus. B01D (separation processes) and C25B (electrolytic production of compounds) form a secondary tier, with B01J (chemical and physical processes and catalysis), C01B (inorganic compounds), H01M (batteries and cells), and A61L (sterilisation and disinfection) each representing smaller but non-trivial shares of activity.
↗ 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 water treatment system and method
Systems and methods for treating water are provided. In certain examples, the water to be treated is seawater. The systems and methods may utilize an electrochemical water treatment device comprising ion exchange membranes. In at least one example, the electrochemical water treatment device may be configured to perform a desalination process on seawater. In… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Non-fouling flow through capacitor system | 249 |
| 2 | Aqueous treatment apparatus utilizing precursor ma… | 234 |
| 3 | Apparatus for electrochemical treatment of water | 217 |
| 4 | Method of electrolysis employing a doped diamond a… | 211 |
| 5 | Electrochemical treatment of an aqueous solution | 158 |
| 6 | Electrochemical conversion of anhydrous hydrogen h… | 153 |
| 7 | Electrochemical treatment of effluent water | 152 |
| 8 | Pressurized vapor cycle liquid distillation | 151 |
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 post-peak lifecycle, a clear leader, and several under-served adjacent branches defines a field where incremental core-technology investment faces crowding, but selective moves into adjacent spaces carry lower prior-art density.
Post-peak field; annual volume has eased from 2019 highs
The lifecycle evidence places this field in decline, with annual filings easing back from the 2019 peak of 312 families. This pattern is consistent with core electrochemical treatment technology entering a consolidation phase. New entrants should focus on differentiated sub-technologies rather than broad C02F claims where prior-art density is highest.
Lifecycle: Post-peakModerate concentration with a dominant leader and a fragmented tail
The top five filers hold 31% of the combined total across the hundred largest applicants, with Evoqua at 304 patent families sitting well above any rival. Beyond the top three, the field fragments rapidly. This structure gives Evoqua significant blocking power in mainstream treatment methods while leaving room for niche specialists to operate without direct collision.
Top-5 share: 31%Co-filing activity is sparse but reveals strategic pairings
The most active co-filing pair is Hydrus Technologies and Envirogold Global Pty Ltd with 8 joint families, followed by Evoqua and Hydronovation Inc with 7. Evoqua also co-files with Siemens Private Limited (3 families) and Siemens Industry Inc (2 families), suggesting that larger industrial partners augment its core portfolio. Outotec (Finland) Oy and Metso Outotec Finland Oy share 5 co-filed families, reflecting a corporate restructuring lineage rather than independent collaboration.
Co-filing: limited ecosystemChina leads filings; US and Europe are the next largest markets
China is the leading filing jurisdiction, followed by the United States, Europe (EPO), WIPO (PCT), Australia, and Canada. Japan, Russia, and India also show meaningful filing volumes. The breadth of PCT and EPO filing across the top applicants suggests that commercially significant inventions are being prosecuted globally, making freedom-to-operate analysis multi-jurisdictional by necessity.
Lead office: ChinaGo 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 |
|---|---|---|
| Hydrus Technologies | Envirogold Global Pty Ltd | 8 |
| Evoqua Water Technologies LLC | Hydronovation Inc | 7 |
| Outotec (Finland) Oy | Metso Outotec Finland Oy | 5 |
| Konica Corporation | Organo Corporation | 4 |
| Evoqua Water Technologies LLC | Siemens Private Limited | 3 |
| Evoqua Water Technologies LLC | Siemens Industry Inc | 2 |
| Konica Corporation | Tokai Carbon Co Ltd | 1 |
| Hydrus Technologies | HTX SOLUTIONS LLC | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Evoqua dominates core treatment; Axine and DEKA hold distinct electrolytic niches
The two largest players differ markedly in technology emphasis: Evoqua spans treatment methods and separation broadly, while Axine Water Technologies concentrates on electrolytic compound production alongside core treatment, and DEKA Products LP anchors its portfolio in separation and distillation processes.
Evoqua Water Technologies LLC
Evoqua holds 304 patent families — the largest portfolio in the field. Its technology emphasis spans C02F water and wastewater treatment (257 records), B01D separation processes (138 records), and broader C02F applications (61 records), reflecting a broad horizontal position across core treatment. Recent momentum has contracted sharply, with a trend of -57% in the most recent filing window versus the prior period, consistent with the field-level post-peak pattern.
patent families: 304Axine Water Technologies
Axine Water Technologies ranks third with 131 patent families and differentiates from Evoqua through a stronger emphasis on C25B electrolytic production of compounds (55 and 34 records across sub-classes), alongside its core C02F position. Its recent trend of –65% reflects the same broad market deceleration, though its electrolytic chemistry focus positions it in a less saturated sub-domain than pure treatment-method claims.
patent families: 131| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Evoqua Water Technologies LLC | 38 | ▼ -57% |
| DEKA Products LP | 7 | ▼ -56% |
| Axine Water Technologies | 9 | ▼ -65% |
| Beijing University of Technology | 1 | ▼ -90% |
| Arvia Technology Ltd | 3 | ▲ new entrant |
Sparse adjacent branches in catalysis, disinfection, and battery-cell integration
Several IPC classes appear as lower-share branches relative to the dominant C02F core. These observations of relative sparsity — combined with plausible technical linkages to electrochemical water treatment — may warrant closer investigation for differentiated R&D positioning.
A61L · Sterilising & disinfecting
A61L accounts for a small share of in-scope records relative to C02F, yet disinfection by-product control and point-of-use electrochemical sterilisation are technically adjacent to core treatment methods. The sparse prior-art density in this branch, combined with growing regulatory pressure on pathogen removal in water systems, suggests a realistic entry path for applicants with electrochemical oxidant-generation know-how seeking to extend into medical and food-grade water disinfection.
Search this in Eureka →H01M · Batteries, cells & fuel cells
H01M records represent a low share of the corpus, yet flow-cell and capacitive deionisation architectures sit at the intersection of electrochemical water treatment and energy storage. The relative sparsity of H01M claims in this corpus, compared with the well-populated C02F core, indicates that the integration of energy-recovery or cell-based treatment designs remains an under-filed area. Teams with expertise in both electrode materials and water chemistry are best placed to explore this adjacency.
Search this in Eureka →How leaders differ by technology route across the IPC matrix
Strength of each leader across the main technology routes.
| Player | C02F 1 · Water & wastewater treatment | C02F 101 · Water & wastewater treatment | C02F 9 · Water & wastewater treatment | C02F 103 · Water & wastewater treatment | B01D 61 · Separation processes (filtration etc.) |
|---|---|---|---|---|---|
| Evoqua Water Technologies LLC | Strong · 257 | Emerging · 35 | Emerging · 17 | Moderate · 61 | Strong · 138 |
| Axine Water Technologies | Strong · 127 | Emerging · 11 | Absent | Absent | Emerging · 18 |
| DEKA Products LP | Strong · 107 | Absent | Absent | Absent | Absent |
| Outotec (Finland) Oy | Strong · 50 | Emerging · 10 | Moderate · 24 | Moderate · 15 | Absent |
| Industrie De Nora SpA | Strong · 64 | Moderate · 13 | Absent | Moderate · 14 | Absent |
| Beijing University of Technology | Strong · 43 | Strong · 24 | Absent | Absent | Absent |
| Hydrus Technologies | Strong · 42 | Absent | Moderate · 14 | Absent | Absent |
Frequently asked questions
The analysis covers 2,426 patent families in electrochemical water treatment.
Evoqua Water Technologies LLC leads with 304 patent families, followed by DEKA Products LP with 149 and Axine Water Technologies with 131.
China is the leading filing jurisdiction, followed by the United States and Europe (EPO). This reflects both the scale of domestic Chinese industrial activity and the strategic importance of the US and European markets to international applicants.
No. Annual filings peaked in 2019 at 312 families and have eased since. The lifecycle evidence places the field in a post-peak phase. The most recent filing years (2025, 2026) are under-counted due to publication lag and do not change this assessment.
The most-cited works cover non-fouling flow-through capacitor systems (249 citations), aqueous treatment apparatus using precursor materials (234 citations), apparatus for electrochemical treatment of water (217 citations), and methods of electrolysis employing doped diamond anodes (211 citations).
A61L (sterilising and disinfecting), H01M (batteries, cells and fuel cells), C01B (non-metallic elements and inorganic compounds), and B01J (chemical and physical processes and catalysis) each account for a small share of in-scope records relative to the dominant C02F class, making them adjacent branches worth monitoring for differentiated R&D positioning.
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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.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. PatSnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.