Copper Electrorefining Patents: Top Companies & Trends 2026
Copper Electrorefining Patents: Who Leads and Where Filing Has Cooled
22.5% concentration. The top five assignees account for 214 of 950 records in scope — a concentrated core against a long tail of single- and few-filing entrants. Filings rose to a peak of 43 records in 2020, then declined; over the last fully-published three-year span the count fell from 16 in 2021 to 5 in 2024, a 69% drop. 2025 and 2026 figures are still incomplete due to publication lag and should not be read as a continuation of that decline.
- 1M & T CHEMICALS INC7.5%
- 2MITSUBISHI MATERIALS CORP4.6%
- 3OUTOKUMPU OY3.7%
- 4ASARCO LLC3.6%
- 5OUTOTEC OYJ3.2%
See the full copper electrorefining 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 on copper electrorefining patents
Who holds the most patents in copper electrorefining?
One assignee leads the ranked field with 71 of the 950 records in scope, more than double the fifth-place holder’s 30. The top five combined account for 22.5% of all records, and the top ten reach 36.5% — a concentrated core with a long tail of smaller filers across the remaining ranked companies. Anyone assessing competitive position should look at both the leader’s scope and the tighter cluster sitting just below it, since the gap from fifth to tenth place is comparatively small.
Is copper electrorefining patent filing increasing or declining?
Filing peaked at 43 records in 2020 and has fallen since, with the last fully-published three-year span showing a drop from 16 filings in 2021 to 5 in 2024, a 69% decline. That decline should not be read as the field going quiet, though: publication typically lags filing by around 18 months, so 2025 and 2026 counts are still incomplete. A fair read is that filing has cooled from its 2020 peak, not that current activity has stopped.
What technology areas dominate copper electrorefining patents?
Electrolytic metal production (IPC class C25C) covers 58.8% of the 950 records, by far the largest share, followed by electroplating and electroforming (C25D) at 31.6% and metal extraction and refining (C22B) at 18.0%. Narrower classes such as alloys, electrolytic compound production, material testing and separation processes each cover under 7% of records. Since a single record can carry multiple IPC codes, these shares add up to more than 100% of the total record count.
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 Copper Electrorefining 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.