Polyaluminium Chloride Coagulant Patents: Who Leads and Where the Field Is Open
Concentrated but not locked up. the top 5 assignees hold 28.7% of all 341 records in scope, and the top 10 hold 43.1% — leaving well over half the field to a long tail of single- and few-filing entrants. Filings rose from 10 in 2017 to a peak of 34 in 2020, and after settling lower, climbed again 43% from 2021 (7) to 2024 (10) — the most recent year with a reliable count. Treat 2025 and 2026 figures as still filling in rather than evidence of decline.
- 1KEMIRA OY39
- 2ORGANO CORP17
- 3LAPORTE IND LTD15
- 4KEMIRA KEMI AB14
- 5FERALCO13
See the full polyaluminium chloride coagulants 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 patent landscape
How many patents exist for polyaluminium chloride coagulants?
This dataset identifies 341 published patent families matching polyaluminium chloride, inorganic coagulant and polyferric sulfate terms combined with performance-specific language like basicity ratio, turbidity removal and residual aluminium. That figure covers filings from 2015 through mid-2026, though the most recent one to two years are undercounted because publication typically lags filing by around 18 months. It should be read as a bounded search-defined set rather than every patent ever filed on the topic.
Who are the leading patent holders in polyaluminium chloride coagulant technology?
One assignee leads clearly with 39 of the 341 records, well ahead of the fifth-place holder at 13. The top 5 assignees combined account for 28.7% of all records, and the top 10 combined account for 43.1%, meaning that even with a strong leader, more than half the field's filings sit outside the ten most active companies. This is a moderately concentrated field, not a single-company monopoly.
Is patent filing activity in this field growing or slowing down?
Filings grew 43% from 7 in 2021 to 10 in 2024, the last year with a reliable complete count. Numbers for 2025 and 2026 appear lower only because publications from those filing years are still working through the pipeline, not because underlying interest has dropped. A peak of 34 filings occurred in 2020, so activity has been uneven year to year but shows a genuine recovery through 2024.
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 Polyaluminium Chloride Coagulants 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.