Pyrometallurgy Patents: Top Companies & Filing Trends 2026
- Concentrated at the top. The five most active filers hold 32.3% of all 1,005 records in scope, and the top ten hold 40.6% — a field with real leaders but still a long tail of single- and few-filing entrants.
- Filing has cooled from its 2020 peak. Filings peaked at 123 in 2020; from 2021 to 2024, the last fully-lagged year, activity fell 28%, from 76 to 55 — a real pullback, not just publication lag.
- Metal extraction dominates, batteries are catching up. 78.7% of records sit in C22B (metal extraction & refining), but 17.2% now also touch H01M (batteries, cells & fuel cells), signalling recovery routes increasingly built around battery-metal feedstocks.
Filing growth compares 2021 (76 records) with 2024 (55) — 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 1,005 records in scope (CR5), not by the ranked leaders only.
What the pyrometallurgy patent record actually shows
Pyrometallurgy patenting sits at the intersection of ore composition, metal recovery and process residue handling — the search underpinning this page pulls together thermal metal extraction with the reagents, equipment and byproduct streams around it. Across 1,005 records published between 2015 and the 2026 cut-off, the field shows a familiar shape for extractive-metallurgy IP: a small group of filers with sustained programmes, and a much larger group filing once or twice around a specific residue stream, reagent chemistry or recovery electrode.
Because publication lags filing by roughly 18 months, the most recent one to two years in any trend understate real activity — 2024 is the last year that can be read as a complete picture, and it already shows filing pulling back from the 2020 peak rather than accelerating.
Filing trend and technology composition
The two views below cover the same 1,005 records: one tracks filing activity by year, the other breaks the corpus down by IPC subclass. Because a single record can carry several classes, the class shares add up to more than 100% of the record total — that is expected, not an error.
Filings rose to a 2020 peak, then pulled back
Filings climbed from 69 in 2017 to a peak of 123 in 2020, then eased. Over the last fully-lagged three-year window, 2021 to 2024, filings fell 28%, from 76 to 55 — a genuine cooling rather than an artefact of publication lag, since 2024 data is largely settled.
Metal extraction dominates; batteries are a growing secondary theme
C22B (metal extraction & refining) anchors the field at 78.7% of records. H01M (batteries, cells & fuel cells) reaches 17.2%, well ahead of alloys (C22C, 9.0%) and solid waste disposal (B09B, 8.8%) — evidence that recovery from battery feedstocks has become a distinct, sizeable sub-theme rather than a niche.
Shares are the percentage of the 1,005 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Pyrometallurgy Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about pyrometallurgy patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a recent representative filing
Metal compound, metal recovery electrode, and method for recovering metals from spent electrodes
Filed by Institut national de la recherche scientifique and published 2025-10-30, this filing describes an electrochemical cell that uses cyclic voltammetry to dissolve metal from a spent electrode and adsorb it onto a purpose-built metal recovery electrode, forming a composite electrode. It represents the electrochemical, battery-adjacent branch of recovery claims rather than classic thermal pyrometallurgy.Abstract trimmed for length; full claim language is available in the source record.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20160045841A1 | New and improved system for processing various chemicals and materials | 860 |
| 2 | WO2014153570A2 | New and improved system for processing various chemicals and materials | 219 |
| 3 | US5607619A | Inorganic perbromide compositions and methods of use thereof | 116 |
| 4 | US4244734A | Process for recovering metal values from materials containing arsenic | 81 |
| 5 | US4298581A | Process for recovering chromium, vanadium, molybdenum and tungsten values from a feed material | 71 |
| 6 | US20200399737A1 | Recycling li-ion batteries using green chemicals and processes | 62 |
| 7 | CN101643857A | 一种复杂铜铅锌银多金属硫化矿综合回收方法 | 60 |
| 8 | WO2018060202A1 | Improved solder and method for producing high purity lead | 53 |
| 9 | US6699302B1 | Treatment of metal sulphide concentrates by roasting and electrically stabilized open-arc furnace smelt reduc… | 50 |
| 10 | US5620585A | Inorganic perbromide compositions and methods of use thereof | 47 |
Citation counts favour older filings simply by virtue of time in circulation — treat them as a signal of influence on the field, not of current technical 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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Three patterns stand out once the record-level data is aggregated: where citation weight sits, how receiving-office choice maps to strategy, and how thin the collaborative filing layer still is.
Old system-level filings still carry the most citation weight
The most-cited record in the corpus, a system for processing various chemicals and materials, sits well above the next-highest citation counts. That gap reflects age and breadth of claim, not that thermal extraction chemistry has settled — newer, narrower recovery-electrode and reagent claims simply haven't had time to accumulate citations.
US and PCT routes lead, but Australia and India are not far behind
The United States (208) and WIPO/PCT (132) lead receiving-office counts, with Europe (117), Australia (96), India (81) and Canada (77) close behind. That spread suggests filers are protecting recovery and refining processes across multiple resource-producing jurisdictions rather than concentrating on one home market.
Joint filing is rare and clustered around a handful of relationships
Only ten co-assignee pairings appear across the whole corpus, and the strongest of them repeat just three or four times. Most pyrometallurgy patenting activity in this dataset is filed by a single assignee acting alone, which leaves partnership-based entry — licensing in a process route rather than building it from scratch — comparatively open.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to pyrometallurgy patent landscape, with the prior art for and against each one.
Who holds the ground, and where the gate is loosest
The ranked leaders in this corpus hold a real but not overwhelming share of the field: the top five account for 32.3% of all 1,005 records and the top ten for 40.6%, leaving roughly six in ten records spread across a long tail of smaller filers. Recent-year momentum among several previously active names has dropped to zero, which is consistent with the broader 2021-2024 pullback rather than a sign those programmes have wound down for good.
Top five hold a third of the field
A third of all records trace to just five assignees, spanning smelting operators, recovery-technology developers and at least one major mining group. That is enough concentration to make freedom-to-operate checks against the leaders essential, but not enough to call the field closed.
Below the top ten, filing fragments quickly
Tenth place holds 15 records against a leader at 128 — a steep drop-off that indicates most of the ranked assignees are filing occasionally around a specific reagent, residue stream or recovery route rather than running a sustained programme.
Recent-year activity has gone quiet even among established names
Several assignees that filed steadily in earlier years show zero filings in the latest tracked year, some with year-over-year declines of -100%. Given the roughly 18-month publication lag, this likely overstates the slowdown, but it is consistent with the documented 2021-2024 pullback in overall filing.
| Assignee | Recent year | YoY |
|---|---|---|
| Metallo Belgium | 0 | — |
| AURUBIS BEERSE | 0 | — |
| Innovative Technology Management Corp. | 0 | -100% |
| William Marsh Rice University | 0 | -100% |
| LI CYCLE CORP | 0 | — |
| Vale SA | 0 | — |
| Ecolab USA Inc. | 0 | — |
| National University of Singapore | 0 | -100% |
Where to take this from here
The dataset points to two practical next steps: checking a specific process route against the leaders' claim scope, and watching whether the 2021-2024 pullback continues once 2025-2026 data fully lags in.
Run a freedom-to-operate check against the top filers
With a third of all records held by five assignees, any new thermal extraction or recovery process should be checked against their specific claim scope before development spend goes further.
Explore assignee claim scope in EurekaTrack whether the filing pullback holds through 2025-2026
The 76-to-55 decline from 2021 to 2024 is real, but 2025-2026 figures are still filling in under publication lag. Re-checking the trend in six to twelve months will show whether the field is genuinely contracting or resetting after its 2020 peak.
Monitor filing trends in EurekaCommon questions about pyrometallurgy patents
The corpus ranks 100 assignees, and the top five between them hold 32.3% of all 1,005 records, with the leader alone at 128. That leaves a substantial long tail: the tenth-ranked assignee holds just 15 records, meaning most of the ranked companies file occasionally around a specific process or reagent rather than running a broad programme. Checking a candidate process against the top five is the highest-value first step for freedom-to-operate work.
Filing peaked at 123 records in 2020 and has since pulled back: from 2021 to 2024, the last year that can be read as complete once publication lag is accounted for, filings fell 28%, from 76 to 55. Figures for 2025 and 2026 are still filling in, since publication typically lags filing by around 18 months, so they should not yet be read as confirming or reversing that trend. On the evidence available, the honest description is a cooling field rather than a growing one.
Metal extraction and refining (IPC class C22B) appears in 78.7% of the 1,005 records, making it the dominant claim area by a wide margin. Batteries, cells and fuel cells (H01M) follow at 17.2%, ahead of alloys (C22C, 9.0%) and solid waste disposal (B09B, 8.8%), which points to battery-metal recovery becoming a distinct and sizeable secondary theme rather than a marginal one. Because records can carry multiple IPC classes, these percentages overlap and do not sum to 100%.
The clearest openings sit below the dominant C22B extraction claims, in areas like battery-electrode metal recovery, residue-stream reagent chemistry, and electrolytic recovery from spent electrodes — branches with real filing activity but far thinner coverage than core thermal extraction. Co-assignee filing is also rare across the corpus, with only ten pairings recorded, which suggests licensing-in or joint-development entry routes are comparatively unclaimed compared with the core process patents themselves.
The United States leads receiving offices with 208 filings, followed by the WIPO/PCT route at 132 and the European Patent Office at 117. Australia (96), India (81) and Canada (77) all show meaningful volume as well, reflecting that resource-producing jurisdictions outside the US and Europe are treated as core filing targets, not afterthoughts, for pyrometallurgy process protection.
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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.