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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/cooling-water-scale-and-corrosion-inhibitors-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Water Treatment ChemicalsCooling water scale and corrosion inhibitor patents: who holds ground and where filing has gone quiet
- Filing is concentrated at the top. the five leading assignees together hold 44.4% of all 216 records in scope, and the ranked ten hold 69.0%.
- Filing has fallen sharply since the last complete years. the leading assignees show zero filings in the latest year, and 2021-to-2024 activity is down 100% on the tracked measure.
- Corrosion and heat-exchanger classes are the thin spots. F28F heat-exchanger detail claims appear in only 6.0% of records and C07F organo-metallic claims in only 5.6%, against 67.1% for water treatment overall.
216
Published Records
44%
Top-5 Share of All Records
-100%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (1 records) with 2024 (0) — 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 216 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Field Overview
What this patent set covers
This landscape tracks 216 published records filed against cooling water treatment, phosphonate scale inhibitor and corrosion-coupon search terms, spanning 2015 through the 2026 data cut-off. The technical core is phosphonate chemistry and calcium carbonate scaling control, paired with claims on cycles-of-concentration management and yellow-metal passivation — the practical levers operators use to keep recirculating cooling systems free of scale and corrosion without over-dosing chemical treatment. Filing offices skew toward the United States and Europe, with meaningful volume also routed through Canada, Australia and the WIPO PCT channel.
Reading this set as patent families rather than raw filings matters here: continuation practice and multi-jurisdiction filing can inflate a single invention into several documents, so the family-level concentration figures below are the fairer measure of who actually controls claim territory.
Filing trend and technology composition, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Cooling Water Scale and Corrosion Inhibitors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
The Numbers
Filing trend and technology composition
Two views of the same 216-record set: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
A peak in 2018, then a steep drawdown
Filings ran from 3 in 2017 up to a peak of 12 in 2018, then declined; the tracked 2021-to-2024 span shows a 100% drop, and the leading assignees report zero filings in the most recent complete year. Because publication lags filing by roughly 18 months, the last one or two years in the chart will fill in further — they should not be read as a slowdown on their own.
Water treatment dominates; heat-exchanger and organo-metallic claims are thin
C02F water and wastewater treatment appears in 67.1% of the 216 records, with C23F corrosion and metal removal a distant second at 36.6%. Materials, polymer and testing classes sit in the 6-15% range, and F28F heat-exchanger detail and C07F organo-metallic compound classes each cover under 7% of records — a sign that claim writers have concentrated on the treatment chemistry itself rather than on the hardware or exotic compound classes around it.
Shares are the percentage of the 216 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Cooling Water Scale and Corrosion Inhibitors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Representative and most-cited filings
Representative Filing
Colorant Tracer for Cooling Water Treatment Formulations (US20080020470A1)
PROCHEMTECH INTERNATIONAL, INC.
Water-based colorant-traced formulations combine one or more water treatment agents — phosphonates, polyacrylic acids, polymers, azoles, molybdate, polysilicates, phosphates, zinc compounds and polyphosphates among them — with a water-soluble colorant detectable in the 580-640 nm visible range that stays chemically inert relative to the treatment agents. Measuring the colorant optically lets an operator back-calculate the concentration of the treatment product in circulating water and adjust dosing to control scale, corrosion, deposition and microbiological growth.Filed by ProChemTech International; published 2008-01-24.
Highest-cited records in the corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6369894B1 | Modular fluorometer | 93 |
| 2 | US5416323A | Leak detection and responsive treatment in industrial water processes | 90 |
| 3 | US3837803A | Orthophosphate corrosion inhibitors and their use | 90 |
| 4 | US4659481A | Water treatment polymers and methods of use thereof | 88 |
| 5 | US5338477A | Polyether polyamino methylene phosphonates for high pH scale control | 82 |
| 6 | US20080020961A1 | Low Molecular Weight Graft Copolymers | 73 |
| 7 | US4464315A | Indexing controller system and method of automatic control of cooling water tower systems | 70 |
| 8 | US4752443A | Cooling water corrosion inhibition method | 68 |
| 9 | US4923634A | Cooling water corrosion inhibition method | 59 |
| 10 | EP0451434A1 | Method for controlling deposits and corrosion in water treatment applications | 55 |
Citation counts reflect influence within this searched corpus and favour older filings; they are not a measure of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Cooling Water Scale and Corrosion Inhibitors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the data means for a filing decision
Three read-outs from the concentration, trend and classification figures above, aimed at where a new filing would actually land.
Concentration
44.4% held by top 5
of 216 records
Claim space is crowded at the top
The five leading assignees together hold 44.4% of all 216 records, and the ranked ten extend that to 69.0%. New entrants filing on phosphonate-based scale and corrosion chemistry are filing directly into ground the incumbents have already staked out, particularly in C02F and C23F classes.
Based on the 40-company assignee ranking returned for this dataset.
Momentum
-100% (2021 to 2024)
tracked filing measure
Filing activity has gone quiet across the leaders
The leading assignees report zero filings in the latest tracked year, and the 2021-to-2024 measure is down 100%. Read this alongside the 18-month publication lag: it signals a real slowdown through the last complete year rather than an ongoing collapse, since 2025-onward data is still filling in.
Peak filing year so far was 2018, at 12 records.
Technology Gaps
6.0% F28F coverage
of 216 records
Hardware-adjacent claims are thin
Heat-exchanger detail (F28F) and organo-metallic compound (C07F) classes each sit under 7% of records, while core water-treatment claims (C02F) cover 67.1%. That gap suggests the chemistry itself is well claimed but its integration with exchanger hardware and non-phosphonate organo-metallic routes is comparatively open.
Class shares sum above 100% because records can carry multiple IPC codes.
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Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to cooling water scale and corrosion inhibitors, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Cooling Water Scale and Corrosion Inhibitors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Competitive Landscape
Who holds the ground, and where the field is open
The ranked assignee list covers 40 companies across the 216 records in scope, with sharp concentration at the top and a long tail of single- or few-filing entrants below the ranked ten.
Leader
23 records
leading assignee
A single filer sets the pace
The top-ranked assignee holds 23 of the 216 records in scope, well ahead of the field, with the gap to fifth place (16 records) and tenth place (8 records) showing a steady taper rather than a cliff.
Counted at the record level across the 40-company ranking.
Mid-tier
16 at fifth, 8 at tenth
records held
A workable second tier, then a long tail
Positions five through ten hold meaningful but declining volume, from 16 down to 8 records, before the ranking thins into companies with a handful of filings each — typical of a field where a few incumbents built early portfolios and later entrants filed narrowly.
Ranked list is the full 40-company set the dataset returns, not a top-50 or top-100 cut.
Recent Activity
0 in latest year
for named leaders
Momentum has stalled across the incumbents
Every one of the leading assignees tracked for recent-year momentum shows zero filings in the latest year. Combined with the -100% three-year measure, this points to a mature, currently quiet filing environment among the historic leaders rather than active portfolio-building.
Momentum measured per-assignee for the most recent tracked year.
Recent-year filing momentum by leading assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Nalco Company | 0 | — |
| Calgon Corporation | 0 | — |
| BetzDearborn Inc. | 0 | — |
| Buckman Laboratories International, Inc. | 0 | — |
| Ecolab USA Inc. | 0 | — |
| Amsa, Inc. | 0 | — |
| National Starch and Chemical Investment Holding Corporation | 0 | — |
| BL Technology, Inc. | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Cooling Water Scale and Corrosion Inhibitors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Next Steps
Where to take this analysis
The figures above establish the shape of the field; the next step is testing a specific claim or company against the full record set.
Check freedom-to-operate on a specific chemistry
Run a targeted search against the phosphonate, polymer or organo-metallic classes identified as thin before drafting new claims in those areas.
Search Patsnap Eureka →Track a named assignee's portfolio in detail
Pull the full filing history for any of the ranked leaders to see which specific sub-claims they hold and where their coverage stops.
Explore assignee portfolios →Watch for renewed filing activity
Set an alert on this search string to catch new publications as the 2025-2026 filing lag fills in and the recent trend becomes clearer.
Set up monitoring →Source: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Cooling Water Scale and Corrosion Inhibitors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on this landscape
Filing is concentrated: the five leading assignees together hold 44.4% of the 216 records in this dataset, and the ranked ten hold 69.0%. The single leading assignee holds 23 records, roughly a third more than the fifth-place holder's 16. This pattern is typical of a chemistry-driven field where a handful of specialty water-treatment companies built portfolios early and later entrants filed in smaller numbers. Anyone assessing competitive risk should look at the leader's specific claims first, since they cover the largest single block of prior art.
Filing peaked at 12 records in 2018 and has declined since; the tracked 2021-to-2024 measure shows a 100% drop, and the leading assignees report zero filings in the most recent year. That said, publication lags filing by roughly 18 months, so the last one or two years in any trend chart are always undercounted and should not be read as the final word. Taken together, the data through 2024 points to a genuine slowdown among the historic leaders rather than a data artefact.
The bulk of records classify under C02F (water and wastewater treatment, 67.1% of the 216 records) and C23F (corrosion and metal removal, 36.6%). Supporting classes include C09K materials, C08L polymer compositions, and smaller shares in analytical testing, heat-exchanger detail, separation processes and organo-metallic compounds. Because a single record can carry several IPC codes, these shares add up to more than 100% — they describe overlapping claim coverage, not a partition of the field.
The thinnest coverage relative to the core water-treatment classes sits in F28F (heat-exchanger details, 6.0% of records) and C07F (organo-metallic compounds, 5.6%), compared with 67.1% for C02F overall. That gap suggests claims tightly integrating dosing or monitoring hardware with heat-exchanger design, or built around non-phosphonate organo-metallic passivation chemistries, are comparatively under-claimed. Any filing strategy targeting this space should still run a direct freedom-to-operate search, since low class density is a starting signal, not proof of open ground.
Not necessarily. The most-cited records in this corpus, including filings on orthophosphate corrosion inhibitors and water treatment polymers, are older documents that have simply had more time to accumulate citations within the searched set. Citation count is a better signal of historical influence on later filings than of current commercial relevance or enforceability. A newer, less-cited filing can still be the more relevant prior art for a present-day freedom-to-operate check.
Answers are grounded in the same dataset. Derived from a Patsnap search on Cooling Water Scale and Corrosion Inhibitors covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.