Critical-Mineral Recycling Patents: Who Leads, Where the Gaps Are 2026
- Electrolytic routes dominate the claim base. C25C electrolytic metal production and C22B extraction/refining together cover most of the 21 records in scope, so new filings are landing on already-crowded ground.
- One filer holds the largest single share. The leading assignee accounts for 16 of the ranked families against a fifth-place filer with just 1, with a long tail of single-family entrants behind it.
- Filing peaked in 2023, not 2026. Recorded activity rose to 10 filings in 2023; the partial 2026 count of 1 reflects publication lag, not a real slowdown.
What this landscape covers
This landscape tracks patent families addressing critical-mineral recovery and recycling — filings that combine language around critical or strategic metal recovery with a specific hydrometallurgical or separation route: solvent extraction, selective precipitation, leach-solution processing or membrane-based metal separation. The scope is deliberately narrow: it is not all mining or all battery-materials patents, but the intersection where a recovery claim and a named separation mechanism appear together.
Twenty-one records sit in scope as of the data cut-off, filed mainly through the United States receiving office with a secondary flow through the WIPO PCT route and smaller volumes filed directly in India and Australia. That filing pattern points to applicants seeking US protection first and using PCT to hold options open elsewhere, rather than a broad multi-jurisdiction strategy.
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Filing trend and technology composition
Two views of the same 21-record dataset: how filing activity has moved year over year, and which IPC subclasses carry the claim volume.
Filing trend, 2017–2026
Filings were negligible before 2017, built through the early 2020s and peaked at 10 in 2023. The 2026 figure of 1 is partial — publication typically lags filing by around 18 months, so recent years understate true activity until later data cuts catch up.
IPC subclass composition (share of 21 records)
C25C (electrolytic metal production) appears on 66.7% of records and C22B (metal extraction and refining) on 57.1%, making electrolytic and hydrometallurgical routes the two largest claim clusters. B01D separation processes and H01M battery/cell claims each sit at 33.3%, with C01D alkali-metal compounds and C25B electrolytic compound production trailing behind. Because a single record can carry several IPC classes, these shares add up to more than 100% of the record total — they are not mutually exclusive buckets.
Shares are the percentage of the 21 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Critical-Mineral Recycling & Recovery Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about critical-mineral recycling & recovery patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited records
WO2026111783A2 — Polyelectrolyte complexes for critical mineral recovery
A method for extracting one or more cations from a solution may include forming a polyelectrolyte complex by mixing a polycation and a polyanion. An aqueous solution including the one or more cations may be obtained. The polyelectrolyte complex and the aqueous solution may be mixed such that the one or more cations may associate with the polyelectrolyte complex. The polyelectrolyte complex including the one or more cations may be separated from the aqueous solution, and the cations extracted from it.Filed by University of Kansas, published 2026-05-28 — the most recent record in scope.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20240309528A1 | Membrane-based critical minerals purification system | 4 |
| 2 | US12012664B1 | Membrane-based alkali metal extraction system | 3 |
| 3 | US20240309520A1 | Membrane-based alkali metal salt precipitation | 3 |
| 4 | US20240309529A1 | Membrane-based ion exchange system | 3 |
| 5 | US20240309532A1 | Membrane-based alkali metal production system | 3 |
| 6 | US20240313284A1 | Energy reclamation and carbon-neutral system for critical mineral extraction | 2 |
| 7 | US20250305085A1 | Methods to recover critical minerals from aqueous solutions | 1 |
| 8 | US20250075356A1 | Membrane-based critical minerals purification system | 1 |
| 9 | US12148902B2 | Energy reclamation and carbon-neutral system for critical mineral extraction | 1 |
| 10 | US12241171B2 | Membrane-based critical minerals purification system | 1 |
Citation counts inside this corpus favour older, earlier-published records; treat them as a signal of influence rather than of current commercial importance.
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Browse MCP servers →What the numbers mean for a filing decision
Four read-outs from the dataset that matter more for strategy than the raw counts alone.
Electrolytic routes are the densest claim space
C25C and C22B together cover the majority of records in scope. A new filing that relies purely on electrolytic metal production or general extraction/refining language is landing where prior art is thickest, not where it is thinnest.
Membrane-based separation drives the citation record
Every one of the five most-cited records in this dataset is a membrane-based purification, extraction, precipitation or ion-exchange system. That concentration suggests membrane architecture is the mechanism other applicants and examiners are citing back to most.
Activity has not slowed — the data cut has
Recorded filings peaked in 2023 and the 2026 count of 1 looks like a drop-off. Given the roughly 18-month lag between filing and publication, 2025 and 2026 activity is very likely understated in this snapshot rather than genuinely reduced.
One filer dominates a short ranked list
The assignee ranking covers five companies, and the leader's 16 families dwarf the fifth-ranked filer's single family. That is a short, top-heavy list rather than a broad competitive field — most of the activity outside the leader is single-family or academic filing.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to critical-mineral recycling & recovery patent landscape, with the prior art for and against each one.
Who is filing, and where the activity is moving
The ranked list is short — five assignees in total — with momentum data showing where recent-year activity is actually concentrated.
One assignee holds most of the ranked volume
The top-ranked assignee's family count far exceeds the rest of the ranked list combined. That scale suggests a sustained, multi-generation filing programme rather than a one-off application, and its recent-year momentum is flat rather than accelerating.
A single filer carries the newest activity
Environmental & Geo Spatial Solutions (EGSS) Chennai is the only assignee in this dataset with a filing recorded in the latest year, while every other ranked assignee shows a -100% year-on-year change. That makes it the one name in the ranking with visible current-year momentum.
Co-filing is rare and academic
Only one co-assignee pairing recurs in this dataset, linking a drilling-products company with University of Kansas across two records. Outside that pairing, filings in scope are single-assignee, which limits how much can be read into collaboration patterns here.
| Assignee | Recent year | YoY |
|---|---|---|
| ENVIRONMENTAL & GEO SPATIAL SOLUTIONS (EGSS) CHENNAI | 1 | — |
| Laiden Co., Ltd. | 0 | -100% |
| Sunshine Drilling Products Company | 0 | -100% |
| University of Kansas | 0 | -100% |
| West Virginia University Board of Governors (on behalf of West Virginia University) | 0 | -100% |
Where to take this next
The landscape points to a few concrete next steps depending on what you are trying to decide.
Check the 2025–2026 trend against a fresh data cut
Because publication lags filing by roughly 18 months, the apparent 2023 peak and subsequent drop-off need re-checking once later filings publish. Re-running this search in Patsnap Eureka against an updated cut will show whether activity has genuinely slowed or simply not yet surfaced.
Re-run this search in EurekaMap the membrane-based cluster in detail
All five of the most-cited records in this dataset are membrane-based systems. A claim-by-claim comparison of those five records would clarify how much room remains around membrane architecture before filing there.
Compare membrane-cluster claimsWatch the single active recent filer
Environmental & Geo Spatial Solutions (EGSS) Chennai is the only assignee with a recorded filing in the latest year. Tracking this filer's portfolio directly may reveal a direction the rest of the ranked field has not yet moved into.
Track this assignee's filingsCommon questions on critical-mineral recycling patents
Within this 21-record dataset, one assignee leads the ranked list with 16 families, well ahead of the next four ranked assignees, the smallest of which holds a single family. This is a short, five-company ranking rather than a broad competitive field, so the leader's position is unusually dominant relative to everyone else tracked. Anyone assessing freedom to operate should look closely at that leader's claim scope before assuming the rest of the field is comparably active.
Electrolytic metal production (IPC class C25C) appears on 66.7% of the 21 records in scope, and metal extraction and refining (C22B) appears on 57.1%, making these the two densest claim clusters. Separation processes like filtration (B01D) and battery/cell claims (H01M) each sit at 33.3%. Because records can carry multiple IPC classes, these figures overlap rather than partition the dataset, but the pattern is consistent: electrolytic and hydrometallurgical mechanisms carry the bulk of current claim language.
The data shows filings rising to a peak of 10 in 2023, with a partial count of 1 in 2026. That 2026 figure should not be read as a slowdown: publication typically lags filing by around 18 months, so the most recent one to two years in any patent trend are understated until later data cuts fill in. A genuine growth-rate figure is not computable from fewer than four complete recent years, so treat the 2023 peak as the most reliable read point for now.
The densest claim clusters sit in electrolytic metal production and general extraction/refining, while narrower branches — selective precipitation of alkali-metal salts, membrane ion-exchange specifically tuned for lithium brine, and integration of leach-solution processing with wastewater treatment — show much thinner coverage in this dataset. A first claim in one of these narrower branches, tied to a specific mechanism rather than a general recovery goal, has more open ground to work with than a claim built on electrolytic production alone.
WO2026111783A2, filed by University of Kansas and published 2026-05-28, claims a method of forming a polyelectrolyte complex from a polycation and polyanion, mixing it with an aqueous solution so target cations associate with the complex, then separating and extracting those cations. That is a specific polyelectrolyte-complex mechanism, not a claim over cation recovery generally, so routes using membrane separation, solvent extraction or selective precipitation without a polyelectrolyte complex step are not obviously blocked by it. Anyone designing a competing process should still run a full claim-chart comparison rather than relying on the abstract alone.
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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.