Copper Flash Smelting Patents: Who Leads, Where the Gaps Are 2026
- 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.
- Filing has slowed from its peak. 2017 was the high point at 20 filings; 2021-2024 still shows growth, with filings doubling from 3 to 6 over that span.
- Claims cluster in metal extraction. C22B covers 87.7% of the 578 records, while burner and fuel-feed classes each sit under 6%, pointing to where claim density thins out.
Filing growth compares 2021 (3 records) with 2024 (6) — 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 578 records in scope (CR5), not by the ranked leaders only.
What the copper flash smelting patent record shows
Copper flash smelting patenting sits almost entirely inside metal extraction and refining claims, with furnace and burner hardware treated as a secondary layer of protection rather than the primary battleground. The search captures 578 records published between 2015 and mid-2026 that reference flash smelting, matte chemistry, concentrate burners or the process controls around oxygen enrichment, matte grade, slag loss, dust circulation, settler design and sulfur capture. Filing activity peaked in 2017 and has not returned to that level since, though the 2021-2024 window shows renewed growth once the data is read on a complete-year basis.
Because publication trails filing by roughly 18 months, the 2025 and 2026 figures in any trend chart are still filling in and should not be read as a slowdown. The more reliable read is the assignee concentration: a small group of long-established smelting technology firms holds the largest single-firm shares, while a long tail of single-digit filers works around the edges of process control and furnace hardware.
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Filing trend and technology composition
Two views of the same 578-record set: how filing activity has moved year over year, and how those records break down across IPC subclasses.
Filing trend, 2017-2026
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.
IPC subclass composition
C22B (metal extraction and refining) appears in 87.7% of the 578 records, confirming that most claims are written around process chemistry rather than equipment. F27D and F27B, covering furnace details and furnace structures, sit at 23.7% and 15.9% respectively. Burner-specific claims under F23D cover only 5.7% of records, and spraying/atomising claims under B05B cover just 2.4% — both comparatively thin given how central burner and dispersal hardware is to the process.
Shares are the percentage of the 578 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Copper Flash Smelting with Eureka
This page is one run against one query. Ask Eureka your own question about copper flash smelting and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
US6761749B1 — Method for the production of blister copper in suspension reactor
The invention relates to a method of producing blister copper pyrometallurgically in a suspension reactor directly from its sulfidic concentrate. According to the method the copper sulfide concentrate is fed into a suspension reactor, into which cooled and finely ground copper matte is also fed in order to bind the heat released from the concentrate.Filed by Outokumpu, granted 2004 — a single-vessel route from concentrate to blister copper that removes a conversion step other flowsheets still require.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6238457B1 | Method for feeding and directing reaction gas and solids into a smelting furnace and a multiadjustable burner… | 59 |
| 2 | US5449395A | Apparatus and process for the production of fire-refined blister copper | 48 |
| 3 | JP1985248832A | Operating method of flash smelting furnace and concentrate burner for flash smelting furnace | 45 |
| 4 | CN101519731A | 高砷复杂金精矿多元素的提取方法 | 44 |
| 5 | US4210315A | Means for producing a suspension of a powdery substance and a reaction gas | 40 |
| 6 | WO1998014741A1 | Method for feeding and directing reaction gas and solids into a smelting furnace and a multiadjustable burner… | 39 |
| 7 | US4036636A | Pyrometallurgical process for smelting nickel and nickel-copper concentrates including slag treatment | 39 |
| 8 | CN101275185A | 一种富氧侧吹熔池熔炼粗铜的生产工艺及其专用设备 | 38 |
| 9 | US6231641B1 | Enhanced phase interaction at the interface of molten slag and blister copper, and an apparatus for promoting… | 36 |
| 10 | US4490170A | Method for forming a directional and controlled suspension spray of a pulverous material and a reaction gas | 33 |
Citation counts favour older filings simply because they have had longer to accumulate citations inside this corpus — read them as a signal of influence on the field, not of current commercial relevance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for filing strategy
Three signals from the dataset that matter more than the raw record count.
The field is held by a handful of long-standing smelting technology firms
The five leading assignees combine for 46.2% of all 578 records in scope, and that share extends to 63.5% across the ten leading assignees. This is a mature industrial process with a small set of technology licensors rather than a fragmented startup field.
Recent complete years show renewed filing activity
After the 2017 peak of 20 filings, activity dropped, but 2021 to 2024 shows filings doubling from 3 to 6. That is a real signal on complete-year data, even though the overall level remains below the 2017 high.
Process chemistry claims dominate over hardware claims
Metal extraction and refining claims (C22B) touch 87.7% of the 578 records, while furnace hardware (F27D, F27B) and burner-specific claims (F23D) cover progressively smaller shares. Claim space around burner design and fuel feeding is comparatively open.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to copper flash smelting, with the prior art for and against each one.
Who holds the claims, and where the gaps sit
The leading assignees are established smelting-technology suppliers and mining companies; recent-year filing activity from the same group has gone quiet, which is consistent with a mature, licensor-driven field rather than an active filing race.
A single assignee leads by a wide margin
The top-ranked assignee holds 74 records, well ahead of the fifth-place holder at 31 and the tenth-place holder at 14 — a steep drop-off that marks this as a concentrated field rather than an even distribution.
A broad tail of smaller filers works the margins
Beyond the leading names, the ranked leaders extend across 100 assignees, most holding only a handful of records each. These tend to cluster around specific furnace or burner refinements rather than core process chemistry.
Co-filing is limited and mostly institutional
Only ten co-assignee pairs appear in the dataset. The strongest pairing links a mining technology firm with a university, suggesting that most joint filings in this space come from applied research partnerships rather than industry consortia.
| Assignee | Recent year | YoY |
|---|---|---|
| Outokumpu Oy | 0 | — |
| Inco Ltd. | 0 | — |
| Outotec Oyj | 0 | — |
| Outotec Finland Oy | 0 | — |
| Sumitomo Metal Mining Co., Ltd. | 0 | — |
| Noranda Inc. | 0 | — |
| SMS Group GmbH | 0 | -100% |
| Kennecott Utah Copper LLC | 0 | — |
Where to take this next
The dataset points to a mature core process with thinner claim coverage on the hardware side.
Map the burner and settler white space in detail
F23D and B05B claims cover a small share of the 578 records despite burner and dispersal design being central to flash smelting performance. A focused search across these subclasses can surface specific, still-open claim territory.
Explore burner design claimsTrack the leading assignees' recent activity
Recent-year filings from the historically dominant assignees have gone quiet, which raises the question of whether new entrants or adjacent industries (steelmaking, non-metallic compound recovery) are picking up the slack.
Monitor assignee momentumWatch the 2021-2024 growth window play out
Filings doubled from 3 to 6 over that period on complete-year data. Whether that continues once 2025-2026 records finish publishing will indicate if this is a genuine re-acceleration or a short-lived uptick.
Revisit the filing trendFrequently asked questions
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.
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.
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.
US6761749B1, assigned to Outokumpu and granted in 2004, claims a method of producing blister copper directly from sulfidic concentrate in a single suspension reactor, using cooled ground copper matte to absorb the heat released by the concentrate feed. It blocks single-vessel routes that combine smelting and converting in one suspension reactor using matte as the cooling medium. Flowsheets that keep smelting and converting as separate unit operations, or that use a different cooling mechanism, sit outside its specific claim scope, though a freedom-to-operate check against the full claim set is still needed before relying on that distinction.
The historically dominant assignees in this dataset show no recorded filings in the latest year, which could mean either a genuine pause or a publication-lag gap not yet reflected in the data. Given the field's concentration, any renewed activity from the leading assignees would be significant, as would first filings from steelmaking or non-metallic compound sectors that already show secondary IPC overlap (C21C, C01B) with this dataset. Tracking recent-year momentum by assignee is the most direct way to catch a shift early.
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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.