Laboratory Water Purification Patents: Top Companies & Trends 2026
- 44.2% concentration at the top. The five leading assignees hold 183 of 414 records in scope — a field where a handful of filers occupy nearly half the claim space.
- Filing has fallen sharply from its peak. Activity peaked at 25 records in 2021 and dropped to 2 by 2024, a 92% decline — though 2025-2026 figures are still filling in given publication lag.
- Separation and treatment claims dominate the IPC mix. C02F water treatment appears in 62.8% of records and B01D separation in 28.5%, while sterilising (A61L) and cleaning (B08B) sit under 5% each.
Filing growth compares 2021 (25 records) with 2024 (2) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 414 records in scope (CR5), not by the ranked leaders only.
What this field covers
Laboratory water purification patenting spans the hardware that produces ultrapure water — cartridges, membranes, resistivity and organic-carbon monitoring — and the validation logic that proves a system is fit for analytical use. The search scope pulls 414 published records filed or published between 2015 and mid-2026 that combine core purification terms with a monitoring or control mechanism: resistivity tracking, bacterial control, cartridge lifetime, point-of-use delivery, or analytical validation. That pairing matters: a cartridge patent without a monitoring or validation claim sits outside this set, which is why the technology composition below is weighted so heavily toward C02F water treatment and B01D separation rather than generic filtration.
The assignee ranking, filing trend and IPC breakdown that follow are all drawn from this same 414-record set. Because publication trails filing by roughly 18 months, the most recent one to two years understate real filing activity and should be read as provisional rather than a genuine slowdown.
Filing trends and technology composition
Two views of the same 414-record set: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
Filing trend: a sharp pull-back from the 2021 peak
Filings rose to a peak of 25 records in 2021, then fell to 2 by 2024 — a 92% drop over that span. 2017 opened the window at 13. Treat 2025 and 2026 as incomplete; publication lag means those years will still fill in.
Technology composition: treatment and separation lead
C02F (water and wastewater treatment) touches 62.8% of the 414 records and B01D (separation processes) 28.5%, with B01J (chemical/physical processes) at 15.0% and G01N (analytical testing) at 8.9%. A61L (sterilising) and B08B (cleaning) each sit near 4%, marking them as smaller but distinct filing lanes. Records can carry multiple IPC classes, so these figures sum to more than 100% of the record total.
Shares are the percentage of the 414 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Laboratory Water Purification with Eureka
This page is one run against one query. Ask Eureka your own question about laboratory water purification and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this set
US20050098506A1 — Water purification cartridge
The water purification cartridge treats water with a halogen liberated from halogenated hydantoinyl resins and polymers, enabling safe, low-cost purification of non-potable water at the low flow rates typical of gravity-feed systems. It removes bacteria, viruses and some protozoans without external power or added chemical exposure risk, making it suited to gravity-fed, low-pressure point-of-use designs.Filed by Vanson Halosource, this record anchors the halogen-resin cartridge approach that recurs across the co-assignee cluster in this dataset.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5925255A | Method and apparatus for high efficiency reverse osmosis operation | 244 |
| 2 | US6537456B2 | Method and apparatus for high efficiency reverse osmosis operation | 229 |
| 3 | US5531900A | Modification of polyvinylidene fluoride membrane and method of filtering | 159 |
| 4 | US6068770A | Disposable separation module with quick connect capability | 133 |
| 5 | US5302356A | Ultrapure water treatment system | 133 |
| 6 | US5518624A | Ultra pure water filtration | 109 |
| 7 | US6524447B1 | Apparatus and method for photocatalytic purification and disinfection of water and ultrapure water | 102 |
| 8 | US20070175196A1 | Drinking water filtration device | 92 |
| 9 | US5645727A | On-line ozonation in ultra pure water membrane filtration | 85 |
| 10 | US7390343B2 | Drinking water filtration device | 81 |
Citation counts reward older, widely-referenced filings — read them as a signal of influence on later filers, not as evidence of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three findings that change how a filer should read this field, beyond the raw counts.
The field is top-heavy but not closed
The five leading assignees account for 44.2% of all 414 records, and the leader alone holds 57 records — well ahead of fifth place at 16. That leaves a long tail of single- and few-filing entrants holding the remaining share, which is where a targeted claim can still land without colliding with a dominant portfolio.
Recent-year filings are down across every tracked leader
Every one of the major assignees shows zero filings in the latest tracked year, and the overall trend fell 92% from its 2021 peak of 25 to 2 in 2024. This reads less as retreat from the technology than as a maturing claim space combined with publication lag still catching up on 2025-2026 activity.
Treatment and separation crowd out sterilising and cleaning claims
C02F water treatment and B01D separation together dominate the IPC mix, while A61L sterilising and B08B cleaning each sit near 4% of records. That gap suggests disinfection and cleaning-cycle mechanisms tied to purification cartridges are comparatively under-claimed relative to the core treatment hardware.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to laboratory water purification, with the prior art for and against each one.
Who is filing, and where the openings sit
A ranked field of 100 assignees, with clear concentration at the top and a long tail beneath it.
One filer well ahead of the pack
The top-ranked assignee holds 57 records against 16 at fifth place and 9 at tenth — a steep drop-off that marks a genuine leader rather than a tightly bunched group.
US filing dominates, PCT and EPO follow
The United States receives the largest share of filings at 133, ahead of the EPO at 52 and WIPO/PCT at 43. India's 39 filings and Australia's 19 point to meaningful filing activity outside the traditional US-Europe axis.
Collaboration is limited and concentrated in one cluster
Only 10 co-assignee pairs appear in the dataset, and the strongest recurring pairing links a single corporate assignee to named individual inventors across several records — a pattern typical of an inventor-driven portfolio rather than broad joint filing.
| Assignee | Recent year | YoY |
|---|---|---|
| Merck Patent GmbH | 0 | — |
| Evoqua Water Technologies LLC | 0 | -100% |
| MUKHOPADHYAY DEBASISH | 0 | — |
| Siemens Water Technologies Corp. | 0 | — |
| Halosource, Inc. | 0 | — |
| Kurita Water Industries Ltd. | 0 | — |
| VWS UK | 0 | — |
| Evonik Operations GmbH | 0 | — |
Where to take this analysis
The concentration and white-space patterns above are a starting point, not a full clearance search.
Map claims against the under-claimed branches
Run the specific sub-areas flagged above — sterilisation cycles, low-flow organic carbon monitoring, resistivity-linked lifetime signalling — against the full claim text of the leading portfolios before committing a filing strategy.
Explore in Patsnap EurekaTrack the leader's recent filing behaviour
Zero recent-year filings across every major assignee could mean a pause, a pivot to trade secret, or a lag in published data. Confirm which before reading it as a market signal.
Explore in Patsnap EurekaCheck family scope, not just document counts
414 published records sit behind 414 families in this ranking, so continuation filing is not inflating the leader's count here — but always confirm family structure before comparing portfolios across jurisdictions.
Explore in Patsnap EurekaCommon questions on this landscape
The dataset ranks 100 assignees by record count, with the leading filer holding 57 of 414 records and the top five combined accounting for 183 records, or 44.2% of the field. That concentration drops off quickly: fifth place holds 16 records and tenth place 9, meaning the rest of the ranking is a long tail of smaller filers. This is a ranked field, not a top-50 or top-100 list in the traditional sense — it is simply everything the data endpoint returns.
Filing peaked at 25 records in 2021 and fell to 2 by 2024, a 92% decline over that three-year span. However, publication lags filing by roughly 18 months, so 2025 and 2026 figures in this dataset are still incomplete and should not be read as confirmation of a continuing slowdown. The honest read is that the field cooled markedly after 2021, with the most recent trend still an open question.
Water and wastewater treatment (IPC class C02F) appears in 62.8% of the 414 records, and separation processes such as filtration (B01D) in 28.5%. Chemical and physical treatment processes (B01J) and analytical testing (G01N) follow at 15.0% and 8.9% respectively. Sterilising and disinfecting claims (A61L) and general cleaning claims (B08B) each sit near 4%, marking them as comparatively thin areas relative to the core treatment and separation hardware.
US20050098506A1, assigned to Vanson Halosource, claims a water purification cartridge that releases a halogen from halogenated hydantoinyl resins and polymers to disinfect non-potable water at very low flow rates and pressures below about 1 psig, without external power. It targets gravity-feed and low-pressure point-of-use systems and removes bacteria, viruses and some protozoans. Anyone designing a chemical-release disinfection cartridge for low-pressure, low-power point-of-use applications should review this filing's claim scope before finalising a design.
The clearest gaps sit in branches adjacent to the dominant C02F and B01D claim clusters: sterilisation cycles integrated into cartridge design, bacterial control validation specifically at the point of use, organic carbon monitoring tuned for low flow rates, and resistivity-linked cartridge lifetime signalling. These areas show meaningfully lower filing density than the core treatment and separation classes, which suggests room for a well-drafted first claim rather than a crowded prior-art landscape. Confirming this requires checking the specific claim language of the leading assignees' portfolios, not just the IPC-level counts.
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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.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.