Lithium Extraction Patents: Top Companies & Filing Trends 2026
- Filings grew 187% from 2021 to 2024, the last year publication data can be treated as complete, before the usual 18-month lag thins out 2025-2026.
- The top 5 assignees hold 45.7% of all 376 records, and the top 10 extend that to 60.4% — concentrated enough that new entrants need a clear design-around, not an incremental filing.
- C01D alkali-metal compound claims cover 51.1% of records, while C25C electrolytic metal production sits at just 11.2% — a gap between chemical precipitation and electrochemical recovery routes.
Filing growth compares 2021 (31 records) with 2024 (89) — 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 376 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks 376 patent families filed against direct lithium extraction (DLE), brine evaporation, and spodumene ore conversion routes, spanning filings from 2015 through the 2026 cut-off. It captures claims on lithium adsorbents, magnesium-lithium ratio management, acid roasting of ore, and downstream steps like battery-grade lithium carbonate precipitation. The search deliberately joins brine-side and ore-side vocabulary so that both extraction pathways to battery-grade lithium sit in the same view.
Because publication lags filing by roughly 18 months, the most recent one to two years in any trend chart will always look lighter than they eventually turn out to be. Read the trend and concentration figures below as a record of what has already cleared publication, not as a live feed of filing activity.
Let an AI agent run this analysis on your own technology
Pick a task. Every answer cites the patents behind it.
Filing trends and technology composition
Two views of the same 376-record set: how filing volume has moved year over year, and how those records distribute across the IPC subclasses that define the technical routes in scope.
Filing trend, 2015-2026
Filings held near zero through the mid-2010s before accelerating from 2021, reaching a peak of 89 records in 2024 — a 187% rise from 2021's 31 records over that three-year span. 2025 and 2026 figures will rise as publications continue to clear the pipeline.
Technology composition by IPC subclass
C01D (alkali-metal compounds) and C22B (metal extraction and refining) anchor the field at 51.1% and 42.0% of the 376 records respectively, with B01D separation processes close behind at 35.6%. Electrolytic routes — C25B and C25C combined — cover a smaller slice, at 21.3% and 11.2%, suggesting most claimed value still sits in chemical rather than electrochemical processing steps.
Shares are the percentage of the 376 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Lithium Extraction from Brine and Ore with Eureka
This page is one run against one query. Ask Eureka your own question about lithium extraction from brine and ore and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited prior art and a recent filing
Method and system for extracting lithium salt with improved water balance (US20260022024A1)
The application, filed by Aquatech International, claims an ion exchange softener stage that raises the monovalent-to-divalent ion ratio ahead of a lithium adsorbent stage, then recycles the resulting barren brine stream back to regenerate the softener at a monovalent-to-divalent ratio of roughly 100:1 to 1,000,000:1 — an approach aimed at closing the water balance loop that conventional evaporation-pond and single-pass adsorption processes leave open.Filed 2026-01-22 — abstract trimmed for length.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6048507A | Process for the purification of lithium carbonate | 172 |
| 2 | US20040005267A1 | Production of lithium compounds directly from lithium containing brines | 125 |
| 3 | CN102631897A | 一种制备锂吸附剂树脂的方法 | 117 |
| 4 | US6207126B1 | Recovery of lithium compounds from brines | 110 |
| 5 | US20010028871A1 | Process for the purification of lithium carbonate | 104 |
| 6 | US20030228251A1 | Production of lithium compounds directly from lithium containing brines | 83 |
| 7 | US6143260A | Method for removing magnesium from brine to yield lithium carbonate | 69 |
| 8 | WO1999029624A1 | Process for the purification of lithium carbonate | 59 |
| 9 | US20110123427A1 | Production of lithium compounds directly from lithium containing brines | 56 |
| 10 | US20060115396A1 | Production of lithium compounds directly from lithium containing brines | 56 |
Citation counts favour older filings that have had more time to accumulate citations inside this corpus — read them as a signal of influence on the field, not of current filing activity.
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.
Put your own technology through the same analysis
Eureka on the web
When you want the answer in the next five minutes.
The agent works the prompt against patents and technical literature, citing every source.
Run your analysis now →MCP server & REST API
When it has to run inside your own pipeline.
Patent search, landscape analysis and assignee resolution as MCP tools. Drop them into any agent framework, or call REST directly.
Browse MCP servers →What the numbers mean for a filing decision
Three read-throughs from the concentration, composition and citation data above, aimed at where to file and where not to.
The field has a defined leader and a long tail
The leader alone accounts for 67 of the 376 records, with the gap to fifth place (15) and tenth place (9) widening quickly. A new entrant filing a broad brine-chemistry claim is filing into occupied space; the more open ground is in the specific process integrations the leaders have not yet claimed.
Chemical precipitation still dominates over electrochemical recovery
Alkali-metal compound claims (C01D) and metal extraction/refining (C22B) cover the majority of records, while electrolytic metal production (C25C) remains comparatively thin. That imbalance points to electrochemical lithium recovery as a route with less claim density relative to its technical relevance.
Growth is real but concentrated in a short window
The jump from 31 records in 2021 to 89 in 2024 marks the field's most active period on record. Momentum by individual assignee is uneven, though — several early movers show flat or declining recent-year counts, which is consistent with a field where the volume growth is coming from newer entrants rather than incumbents scaling further.
The most-cited prior art predates the DLE boom
The two most-cited records concern lithium carbonate purification and brine-based recovery filed well before the recent filing surge. Their citation counts reflect decades of accumulated reference, not current relevance — any freedom-to-operate review still needs to check them for foundational process claims that later filings build on.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to lithium extraction from brine and ore, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranked assignee list spans 98 companies across brine chemistry, adsorbent materials and ore conversion. A handful hold a disproportionate share of records; most of the list files once or twice.
One company sets the pace on volume
The top-ranked assignee's 67 records is more than four times fifth place (15), reflecting a sustained, multi-year filing program rather than a single burst of activity.
A competitive second tier, then a steep drop
Filing counts fall quickly after the top few names, meaning the top 10's 60.4% combined share of all 376 records is held by a mix of one clear leader and several mid-sized programs rather than an even spread.
Recent-year activity is uneven across incumbents
Several established filers show sharp year-over-year declines in the latest year, alongside newer names filing for the first time — a pattern consistent with a field still attracting new entrants even as some early movers slow down.
| Assignee | Recent year | YoY |
|---|---|---|
| Lilac Solutions, Inc. | 1 | -80% |
| Xerion Advanced Battery Corp | 1 | — |
| Mangrove Water Technologies Ltd | 0 | -100% |
| Energy Exploration Technologies Inc | 0 | -100% |
| K-UTEC AG Salt Technologies | 0 | — |
| Innovator Energy LLC | 0 | — |
| ELEMENT3 A DBA OF LITHOS IND INC | 0 | -100% |
| K-UTEC AG Salt Technologies | 0 | — |
Where to take this next
The landscape data points to specific next steps depending on whether the goal is freedom-to-operate, competitive tracking or claim drafting.
Check freedom-to-operate against the leader's portfolio
With one assignee holding 67 of 376 records, any new brine-processing filing should be checked against that portfolio's claim scope before drafting.
Explore assignee portfolios in EurekaTrack the electrolytic recovery gap
C25C's 11.2% share against C01D's 51.1% suggests electrochemical lithium recovery has room for claims that are not yet crowded.
Run a white-space search in EurekaWatch 2025-2026 publications as they clear
The 2024 peak of 89 records is the last complete year; monitoring incoming publications will show whether the 2021-2024 growth rate is holding.
Set up filing alerts in EurekaCommon questions on lithium extraction patents
One assignee leads the ranked list with 67 of the 376 records in this dataset, well ahead of the fifth-place holder at 15 and tenth place at 9. The top 5 assignees combined hold 45.7% of all records, and the top 10 hold 60.4%, so filing activity is concentrated at the top with a long tail of single- or few-filing entrants below it. That concentration means a new filer's freedom-to-operate review should prioritise the leading names before the rest of the list.
Direct lithium extraction (DLE) refers to processes that pull lithium from brine without relying on multi-year evaporation ponds, typically using adsorbents, membranes or ion exchange. In this dataset, DLE-related claims sit mainly within the C01D (alkali-metal compounds), C22B (metal extraction and refining) and B01D (separation processes) subclasses, which together cover a majority of the 376 records. The representative 2026 filing from Aquatech International, covering an ion exchange softener paired with a lithium adsorbent stage, is typical of how DLE claims are structured around ion ratio control and brine recycling.
Filings rose 187% from 31 records in 2021 to 89 in 2024, the field's clearest growth window on record. 2024 is treated as the most recent complete year because patent publication typically lags filing by around 18 months, so 2025 and 2026 figures in any dataset will understate true activity until more publications clear. Based on the 2021-2024 trend, the underlying filing rate was still climbing through the most recent complete year measured.
Electrolytic metal production (C25C) covers only 11.2% of the 376 records, notably lower than the 51.1% covered by alkali-metal compound claims (C01D) and 42.0% by metal extraction and refining (C22B). That gap suggests electrochemical lithium recovery methods are comparatively under-claimed relative to chemical precipitation and evaporation-based routes. Sub-areas such as electrolytic lithium metal recovery and closed-loop brine water balance systems are worth a closer look for anyone drafting new claims.
The most-cited record in this set, on lithium carbonate purification, carries 172 citations, with several other purification and brine-recovery patents from the 1990s-2000s also cited well over 100 times. These older filings predate the recent direct lithium extraction filing surge and reflect long-accumulated influence rather than current commercial relevance. Any new filing in lithium carbonate purification or brine recovery should still be checked against these foundational patents, since their broad early claims can still constrain downstream process design.
Research Lithium Extraction from Brine and Ore in depth with Eureka
Go past this page: query the whole lithium extraction from brine and ore corpus yourself, in your own scope.
Every answer comes back with patent numbers you can open.
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.