Biocides for Industrial Water Systems Patents: Top Filers 2026
Biocides for Industrial Water Systems: Patents, Leaders and Filing Trends
56.5% of all filing sits with five companies. Top 5 combined account for 590 of the 1,044 records in scope, a concentration that makes freedom-to-operate checks against a handful of portfolios more useful than a broad landscape scan. Filing climbed to 80 records in 2018 before declining; the 2021-to-2024 window alone shows a drop from 36 to 8 records, a -78% move. Because publication typically lags filing by around 18 months, the 2025 and 2026 figures are still incomplete and should not be read as confirmation the field is still shrinking at that rate.
- 1ECOLAB USA INC178
- 2KEMIRA OY153
- 3NALCO CO143
- 4CLEAN CHEM INC61
- 5A Y LABORATORIES LTD55
See the full biocides for industrial water systems analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions about this landscape
Who are the leading patent holders for industrial water system biocides?
Filing in this space is concentrated: the top five assignees together hold 590 of the 1,044 records in scope, or 56.5%. The single largest filer holds 178 records, well ahead of the fifth-place holder at 55, which marks a steep drop into the long tail. Anyone doing competitive tracking should focus first on the top five to ten names, since the top ten combined already account for 73.8% of all records.
Is patent filing for cooling water and industrial biocides growing or shrinking?
Filing peaked in 2018 at 80 records and has declined since, with the most reliable complete-year comparison showing a drop from 36 records in 2021 to 8 in 2024, a -78% change. Records from 2025 onward are still incomplete because publication typically lags actual filing by about 18 months, so the apparent recent-year drop should not be read as the field going quiet — it is partly a data-lag artefact. The safest conclusion is that the field has contracted from its 2018 peak, not that it has stopped.
What patent classes cover biocide chemistry for water treatment?
The two dominant IPC subclasses are A01N (biocides and agrochemicals), present on 57.9% of the 1,044 records, and C02F (water and wastewater treatment), present on 55.9%. Because most records carry both classes together, a chemistry claim without an accompanying water-treatment application claim is now unusual in this dataset. Secondary classes worth checking include A61L for sterilising and disinfecting applications and the D21C/D21H pulp-industry classes, each covering roughly a tenth or more of records.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Biocides for Industrial Water Systems covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.