Copper Flash Smelting Patents: Filing Trends and Who Holds the Claims
Concentrated at the top. The five leading assignees hold 46.2% of all 578 records in scope, and the ranked leaders extend to 63.5% at ten. Filings peaked in 2017 at 20 and have not matched that level since. Reading only the complete years, 2021 to 2024 shows filings doubling from 3 to 6, a genuine growth signal even though the headline count sits well below the 2017 peak. Treat 2025 and 2026 as incomplete given the roughly 18-month publication lag.
- 1OUTOKUMPU OY74
- 2OUTOTEC OYJ62
- 3INCO LTD56
- 4SUMITOMO METAL MINING CO LTD44
- 5OUTOTEC FINDLAND OY31
See the full copper flash smelting 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
Frequently asked questions
Who are the leading patent holders in copper flash smelting?
The dataset ranks 100 assignees by record count, and the field is concentrated at the top: the leading assignee holds 74 records, well ahead of the fifth-place holder at 31 and the tenth at 14. Together the top five hold 46.2% of all 578 records in scope, rising to 63.5% across the top ten. These are long-established smelting technology suppliers and mining companies rather than recent entrants, which is typical of a mature industrial process with a small group of technology licensors.
Is copper flash smelting patent activity growing or shrinking?
Filing peaked in 2017 at 20 records and has not returned to that level since, but that headline number is misleading on its own. Reading only complete years, filings doubled from 3 in 2021 to 6 in 2024, a real growth signal within a smaller overall volume. Publication lags filing by roughly 18 months, so 2025 and 2026 figures are still filling in and should not be read as evidence of a slowdown.
What technical areas of copper flash smelting have the least patent coverage?
Metal extraction and refining claims (IPC class C22B) appear in 87.7% of the 578 records, meaning most patenting effort goes into process chemistry rather than hardware. Burner-specific claims (F23D) cover only 5.7% of records and spraying/atomising claims (B05B) cover just 2.4%, both thin relative to how central burner design and concentrate dispersal are to the process. Concentrate burner nozzle geometry, settler design and dust circulation loops are areas where claim density is lower than the technical importance would suggest.
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 Flash Smelting 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.