Cobalt and Nickel Refining Patents: Who Leads, Where Gaps Are 2026
- Concentrated at the top. The five most active assignees hold 209 of 471 records in scope (44.4%), and the leading ten hold 61.6% — a long tail of single- and few-filing entrants fills the rest.
- Filing has cooled from its peak. Activity peaked at 33 records in 2022; from 2021's 20 records to 2024's 15, the documented three-year change is -25%, with 2025-2026 still filling in as publications lag filing.
- Refining dominates the claim map. 93.6% of the 471 records sit in C22B (metal extraction and refining) alone, while battery-adjacent H01M claims appear in only 10.0% — a gap between upstream refining and downstream battery-material integration.
Filing growth compares 2021 (20 records) with 2024 (15) — 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 471 records in scope (CR5), not by the ranked leaders only.
What this patent set covers
This landscape tracks 471 patent records published between 2015 and mid-2026 that combine hydrometallurgical refining terms — nickel refining, cobalt separation, pressure acid leaching — with process-specific language such as autoclave corrosion, mixed hydroxide precipitate and nickel sulfate crystallization. The search string is deliberately narrow: it is built to surface documents that describe an actual unit operation, not general mining or battery-materials filings that merely mention nickel or cobalt in passing.
The result skews heavily toward process metallurgy rather than end-use chemistry. Nearly all records sit in the core metal-extraction class, with smaller but consistent overlap into compounds, separation equipment and water treatment — the supporting unit operations around a leach-to-precipitate flowsheet.
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Filing trend and technology composition
Two views of the same 471 records: how filing activity has moved year on year, and which IPC subclasses the claims actually sit in.
Filing activity has passed its peak year
Filings rose from zero in 2017 to a peak of 33 records in 2022, then eased to 15 by 2024 — a -25% change over the 2021-2024 span. 2025 and 2026 figures are still incomplete because publication typically lags filing by around 18 months, so the recent-year dip should not be read as the field going quiet.
Refining claims dwarf every adjacent class
C22B (metal extraction and refining) covers 93.6% of the 471 records, far ahead of C01G compounds (23.4%), B01D separation processes (11.3%) and H01M batteries (10.0%). Because records can carry multiple IPC codes, these shares add to more than 100% — the gap between C22B and everything else is still the key signal: refining process claims are the dense ground, and battery-material integration claims remain comparatively thin.
Shares are the percentage of the 471 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Cobalt and Nickel Refining with Eureka
This page is one run against one query. Ask Eureka your own question about cobalt and nickel refining and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited and representative filings
Continuous mixed hydroxide precipitate production from laterite nickel ore
The filing describes a continuous hydrometallurgical process that uses primary-precipitated mixed hydroxide precipitate particles as crystal nuclei, controlling precipitation conditions, nuclei quantity and reaction time so that particles grow progressively larger. By managing cycle count, the proportion of returned seed crystals and the homogenization ratio with precipitants, the process targets mixed hydroxide precipitate with a narrow particle size distribution, denser particles and better settling behaviour.Filed by PT QMB New Energy Materials, published 2025-06-05 — illustrates the shift toward continuous, seeded MHP crystallization control rather than batch precipitation.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4042664A | Method for separating metal constituents from ocean floor nodules | 73 |
| 2 | US4861565A | Method of separately recovering metal values of petroleum refining catalyst | 72 |
| 3 | US20050265910A1 | Hydrometallurgical process of nickel oxide ore | 59 |
| 4 | US6261527B1 | Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores | 59 |
| 5 | US20010001650A1 | Recovery of nickel and cobalt from ore | 59 |
| 6 | US20060024224A1 | Method for nickel and cobalt recovery from laterite ores by combination of atmospheric and moderate pressure … | 47 |
| 7 | US20060002835A1 | Method for nickel and cobalt recovery from laterite ores by reaction with concentrated acid and water leaching | 45 |
| 8 | US5447552A | Process for the extraction and separation of nickel and/or cobalt | 45 |
| 9 | WO2001032943A2 | Atmospheric leach process for the recovery of nickel and cobalt from limonite and saprolite ores | 43 |
| 10 | US20090249921A1 | Process for production of nickel and cobalt using metal hydroxide, metal oxide and/or metal carbonate | 42 |
Citation counts reflect a corpus that has had years to accumulate references, so older records such as the 1970s-1980s ocean-nodule and refining-catalyst patents lead the table. Treat citation rank as a measure of historical influence on the field's vocabulary, not of current commercial relevance.
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 a filing decision
Three read-throughs from the concentration, trend and classification data above.
The core flowsheet is claimed by a small group
With the five most active assignees holding 209 of 471 records and the leading ten holding 61.6%, core pressure-leach and precipitation process claims sit close to a handful of filers. New entrants are more likely to find open ground in adjacent unit operations than in the central leach-precipitate sequence itself.
Activity has eased from its 2022 peak
Filings rose to 33 records in 2022 before easing to 15 by 2024, a documented -25% shift. Several of the most active historical filers show zero records in the latest tracked year, though the 18-month publication lag means 2025-2026 numbers are not yet a reliable read on current activity.
Battery-material integration is thin relative to refining
C22B refining claims cover 93.6% of records, but only 10.0% also touch H01M battery classes and just 3.4% touch C25C electrolytic production. The overlap between refined nickel/cobalt output and downstream battery-precursor or electrolytic-metal claims is comparatively under-filed given how much refining art already exists.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to cobalt and nickel refining, with the prior art for and against each one.
Assignee landscape
The ranking covers 100 companies across the 471 records in scope — not a top-50 or top-100 cut, but the full ranked list the dataset returns.
One filer sits well ahead of the field
The leading assignee holds 74 records, more than triple the count at fifth place (20) and well ahead of tenth place (13). That gap suggests a filer with a broad, defended process portfolio rather than one built around a single patent family.
A steep drop-off after the leader
Counts fall quickly from the leader to the next tier, then flatten — typical of a field where a small number of majors hold broad process portfolios and everyone else files narrower, more specific improvements.
Even the largest filers show no latest-year activity
Several of the most active historical assignees register zero records in the most recent tracked year, including one with a documented -100% year-on-year change. Given the ~18-month publication lag, this reads as an incomplete recent window rather than a genuine stop in R&D.
| Assignee | Recent year | YoY |
|---|---|---|
| BHP Billiton SSM Development Pty Ltd | 0 | — |
| Vale SA | 0 | — |
| Vale Inco Limited | 0 | — |
| A C N 630 589 507 Pty Ltd | 0 | — |
| BASF SE | 0 | -100% |
| Commonwealth Scientific and Industrial Research Organisation (CSIRO) | 0 | — |
| BHP MINERALS INTERNATIONAL INC | 0 | — |
| Umicore (BE) | 0 | -100% |
Where to take this
The dataset points to specific next steps depending on whether you are scoping freedom-to-operate or looking for a filing gap.
Map the leader's actual claim scope
A single assignee holds 74 of 471 records. Before filing near the core leach-precipitate sequence, pull that portfolio's independent claims to see exactly how broad the blocking coverage is.
Explore assignee portfolios in EurekaCheck the battery-integration gap
Only 10.0% of records touch H01M and 3.4% touch C25C, against 93.6% in core refining. That gap between refined output and battery-precursor or electrolytic claims is worth a focused search before assuming it is open.
Run a white-space search in EurekaTrack the post-2024 filing window
2025-2026 filings are still incomplete due to publication lag. Set an alert on the search string to catch new publications as they land rather than relying on the current partial-year counts.
Set up monitoring in EurekaCommon questions on cobalt and nickel refining patents
One assignee leads the field with 74 of the 471 records in scope, well ahead of the fifth-ranked filer at 20 and the tenth-ranked filer at 13. The top five combined hold 209 records, or 44.4% of all records in scope, and the top ten hold 61.6%. This concentration is based on the full 100-company assignee ranking the dataset returns, not a curated top-50 or top-100 cut, and it means a small number of filers control a disproportionate share of core process claims.
Filing activity peaked at 33 records in 2022 and had fallen to 15 records by 2024, a documented -25% change over that three-year span. It is not accurate to call the field currently slowing, however, because publication typically lags filing by roughly 18 months, so 2025 and 2026 counts are still incomplete and will rise as more filings publish. The safest read is that activity has cooled from its 2022 peak, with the true trajectory for the last two years not yet visible.
The overwhelming majority — 93.6% of the 471 records in scope — fall under IPC class C22B, covering metal extraction and refining processes. Smaller but meaningful overlaps appear in C01G compounds of other metals (23.4%), B01D separation processes such as filtration (11.3%), and H01M batteries and cells (10.0%). Because a single record can carry multiple IPC codes, these percentages add to more than 100%, but the gap between C22B and every other class shows that core refining process claims, not downstream battery integration, are where the bulk of the art sits.
Mixed hydroxide precipitate (MHP) is an intermediate product from laterite nickel ore processing, produced by precipitating nickel and cobalt hydroxides out of a pressure-leach solution before further refining into battery-grade materials. A representative recent filing in this dataset, published in mid-2025, claims a continuous process that uses seed crystals and controlled cycling to produce MHP with a narrower particle size distribution and better settling properties than batch methods. Filers working on MHP crystallization control should review that continuous-process approach closely, since seeded, cycle-controlled precipitation is an active claim area rather than settled art.
Based on the IPC composition, the clearest under-claimed ground sits at the boundary between core refining (C22B, 93.6% of records) and adjacent applications: electrolytic metal recovery (C25C) appears in only 3.4% of records, and battery-cell integration (H01M) in just 10.0%. Wastewater and impurity-stream valorisation (C02F, 3.8%) is similarly thin relative to the refining core. These gaps suggest that claims connecting a refined nickel or cobalt stream to a specific downstream electrolytic or battery-precursor step, or to impurity-stream reuse, are less contested than the central leach-and-precipitate sequence itself.
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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.