Pelletizing Patents: Who Leads, Where the Gaps Are 2026
- Filing activity nearly tripled, rising from 17 records in 2021 to 43 in 2024, the last year with complete publication coverage.
- The field is moderately concentrated, with the top 5 assignees holding 32.2% of all 733 records and the top 10 holding 48.3%.
- Metal extraction dominates the classification mix, C22B appears on 60.6% of records, while battery-adjacent C09K and H01M classes each sit under 8%.
Filing growth compares 2021 (17 records) with 2024 (43) — 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 733 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Pelletizing and green ball formation patents cover the agglomeration of fine iron ore into pellets suitable for blast furnace or direct-reduction feed: binder chemistry (bentonite and organic alternatives), moisture and drop-number control, balling disc and drum mechanics, and seed formation. The scope spans 733 published records filed between 2015 and mid-2026, drawn from a search string anchored on core pelletizing terms crossed with binder and process-control terms.
Because publication lags filing by roughly 18 months, the 2025 and 2026 figures in any trend understate real activity; 2024 is the most recent year that can be read as complete.
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Filing trends and technology composition
Two views of the same 733 records: how filing volume has moved year over year, and which IPC subclasses the underlying inventions sit in.
Filing trend, 2017-2026
Volume rose from 11 records in 2017 to a peak of 43 in 2024, including a +153% climb from 2021 (17) to 2024 (43). 2025 and 2026 figures are still filling in due to publication lag and should not be read as a slowdown.
IPC subclass distribution
C22B (metal extraction & refining) covers 60.6% of the 733 records, far ahead of C04B (ceramics, cement & refractories) at 19.2% and B01J (chemical/physical processes & catalysis) at 16.1%. Because records can carry multiple IPC codes, these shares sum to more than 100% of the record total.
Shares are the percentage of the 733 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Pelletizing and Green Ball Formation with Eureka
This page is one run against one query. Ask Eureka your own question about pelletizing and green ball formation and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
Material for Coating Iron Ore Pelletizing Disks and Drums and a Constructive Arrangement for Pelletizing Disks and Drums
The invention is directed to a material for coating iron ore pelletizing disks and drums and a constructive arrangement for pelletizing disks and drums that is comprised of a mixture of binders with ores of the group consisting of iron, manganese or others, with fluxes also provided. The disk or drum bottom is coated with a cold cure coating material, vegetal oils, minerals and/or gel-forming products to form a bottom layer, and polyethylene plates can be incorporated to aid separation of fines from pellets.Filed by Vale S.A., published 2008-06-19.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6344271B1 | Materials and products using nanostructured non-stoichiometric substances | 408 |
| 2 | US6572672B2 | Nanotechnology for biomedical products | 240 |
| 3 | US6849109B2 | Inorganic dopants, inks and related nanotechnology | 131 |
| 4 | US20160308244A1 | Lithium-oxide garnet batch composition and solid electrolyte membrane thereof | 118 |
| 5 | US6713176B2 | Processing and manufacturing methods enabled using non-stoichiometric nanomaterials | 117 |
| 6 | US6830822B2 | Inorganic colors and related nanotechnology | 115 |
| 7 | US20120227968A1 | Proppant Particles Formed From Slurry Droplets and Method of Use | 113 |
| 8 | US6573212B2 | Method of making shaped activated carbon | 112 |
| 9 | US6569518B2 | Nanotechnology for electrochemical and energy devices | 111 |
| 10 | US6562495B2 | Nanoscale catalyst compositions from complex and non-stoichiometric compositions | 109 |
Citation counts favour older filings inside any searched corpus; they signal historical influence, not current commercial weight.
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 decisions
Read together, the concentration figures and the classification mix point to a field where the core mechanical and binder claims are well occupied, while adjacent process-control and battery-feed applications remain comparatively open.
A moderate leader, not a monopoly
The leading assignee holds 63 records against a fifth-place figure of 35 and a tenth-place figure of 21 – a real gap at the top but a long tail below it, since the top 10 combined only reach 48.3% of all records in scope.
Momentum is recent and steep
Filing volume nearly tripled across the three years leading into 2024, the last year with complete publication coverage, indicating the underlying process chemistry and disk/drum mechanics are still being actively re-claimed rather than settled.
Metal extraction claims dominate
C22B (metal extraction & refining) appears far more often than C04B or B01J, confirming that most inventions are framed as ore-processing improvements rather than as generic binder or ceramics chemistry.
Filing is spread across major offices
The United States leads with 185 records, followed by Europe, India, Canada, Australia and WIPO PCT filings, showing this is a globally contested process technology rather than one confined to a single steel-producing region.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to pelletizing and green ball formation, with the prior art for and against each one.
Who is filing, and where the field is still open
The ranked leaders concentrate around integrated miners, steelmakers and specialty chemical suppliers, with a long tail of single- or few-filing entrants behind them.
A mining major sets the pace
The leading assignee's filing volume is nearly double the fifth-place figure of 35, concentrated on disk and drum coating, binder mixtures and pelletizing plant mechanics.
Binder chemistry is a shared research track
Several of the strongest co-assignee pairs in this dataset link a specialty chemicals group with its own international arm, pointing to binder formulation as an area developed jointly across corporate entities rather than filed solo.
Recent-year activity has cooled among historic leaders
Several of the highest-ranked assignees by cumulative count show zero filings in the most recent year tracked, consistent with publication lag but also suggesting a possible opening for newer entrants to claim ground the incumbents have not recently contested.
| Assignee | Recent year | YoY |
|---|---|---|
| Carbo Ceramics Inc | 0 | -100% |
| Vale S.A. | 0 | — |
| Akzo Nobel N.V. | 0 | — |
| Kobe Steel, Ltd. | 0 | — |
| Tata Steel Ltd. | 0 | — |
| NANOPRODUCTS CORP | 0 | — |
| S.P.C.M. SA | 0 | — |
| Union Carbide Corporation | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio benchmarking, or spotting where to file next.
Map the top assignees' active claim sets
Pull the full claim scope behind the leading assignees' disk, drum and binder filings before drafting in that space.
Explore assignee portfolios in EurekaCheck the under-claimed branches
Run a focused search across moisture-control sensing and organic binder substitutes to confirm how thin the prior art really is.
Run a white space search in EurekaTrack 2025-2026 publications as they land
Because of publication lag, re-check filing counts for the most recent two years once more records surface.
Set up a monitoring alert in EurekaCommon questions about pelletizing patents
This dataset contains 733 published patent records filed between 2015 and mid-2026 that match core pelletizing terms crossed with binder and process-control terms such as bentonite binder, moisture control and drop number. The true figure for the field as a whole will be larger, since any search string sets a boundary rather than capturing every adjacent filing. Because families are the fairer counting unit, this total is expressed as patent families in the assignee ranking rather than raw document counts.
One assignee leads the ranked list with 63 records, well ahead of the fifth-ranked assignee at 35 and the tenth at 21. The top 5 assignees combined hold 32.2% of all 733 records in scope, and the top 10 combined hold 48.3%, meaning more than half of all filings sit outside the ten most active companies. That long tail includes universities, national steel producers and specialty chemical suppliers filing in smaller volumes.
Filing volume grew sharply in recent years, rising from 17 records in 2021 to 43 in 2024, a +153% increase, with 2024 standing as the peak year and the last year with complete publication coverage. Counts shown for 2025 and 2026 will look lower, but that reflects the roughly 18-month lag between filing and publication rather than an actual drop in activity. Anyone reading the trend chart should treat the final one to two years as still filling in.
Bentonite binder remains the reference point that most alternative binder claims are written against, and organic binder substitutes appear repeatedly across the dataset's classification mix, particularly under C04B and B01J. The strongest co-assignee links in this dataset connect specialty chemicals groups working jointly across affiliated entities, suggesting binder formulation is often developed as a shared research track rather than filed by a single company alone. Moisture control and drop-number test methods frequently appear alongside binder claims rather than as standalone filings.
The classification data shows heavy concentration in C22B metal extraction claims (60.6% of records) and comparatively thin coverage in battery-adjacent classes like H01M (7.4%) and C09K (7.8%), despite growing interest in pellet feed for direct-reduction and battery-grade applications. Sub-areas such as moisture-control sensing integrated into balling discs, automated drop-number testing, and seed formation specifically for direct-reduction feed appear less densely claimed than the core disk and drum coating art. Confirming this requires a targeted freedom-to-operate search rather than relying on classification density 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.