Pellet Induration Furnaces Patents: Who Leads, Trends 2026
- Filing peaked in 2021 at 10 records then fell to 0 by 2024, a -100% swing that predates the usual 18-month publication lag — later years will still fill in, but the drop-off from peak is real.
- No single assignee dominates the field. the ranked leader holds 15 families across 15 identified organisations, with most of the field filing in single digits.
- Battery-adjacent classification shows up in 11.6% of records (H01M), a signal that induration know-how is migrating toward electrode and cell thermal processing claims.
Filing growth compares 2021 (10 records) with 2024 (0) — 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.
What this patent set covers
This landscape covers 86 published records matching induration furnace, grate-kiln and straight-grate terminology combined with process-control concepts such as thermal profile, pellet compressive strength, dust carryover, preheat zone temperature, gas recirculation and refractory wear. The scope spans 2015 to the 2026-07-31 data cut-off, capturing both the mechanical furnace hardware and the process-control layer sitting on top of it.
Classification data shows the set is anchored in metallurgical processing rather than pure combustion engineering: C22B (metal extraction and refining) touches over half of records, while furnace and kiln hardware classes (F27D, F27B) and combustion classes (F23C, F23D, F23N) each cover a smaller, overlapping slice. The presence of H01M (batteries and cells) at double-digit share is the one class that does not fit the traditional ironmaking frame.
Filing trend and technology composition
Two views of the same 86-record set: the year-by-year filing count, and the IPC subclasses those records fall into. Because a single record can carry more than one classification, the subclass shares add up to well over 100% of the record total.
Filing trend, 2015-2026
Filings rose to a peak of 10 in 2021 before falling to 0 by 2024, the last year treatable as complete; 2025 and 2026 are still filling in under the usual publication lag and should not be read as a continued decline.
IPC subclass composition
C22B (metal extraction & refining) appears in 52.3% of the 86 records, well ahead of furnace-hardware classes F27D and F27B (22.1% and 19.8%) and combustion classes F23C, F23D and F23N. H01M (batteries, cells & fuel cells) reaches 11.6%, matching combustion-control class F23N.
Shares are the percentage of the 86 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Pellet Induration Furnaces with Eureka
This page is one run against one query. Ask Eureka your own question about pellet induration furnaces and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records in this set
US8571715B2 — On-line optimization of induration of wet iron ore pellets on a moving grate
Discloses a system for optimizing induration furnace operation: an interactive means to monitor and control the furnace, calibration means generating ideal set points for validation, and a processing unit that computes real-time active set points, compares them against the ideal set points, and issues an optimizing signal to the interactive means when correction is required.Filed by Tata Consultancy Services Limited, dated 2013-10-29 — this claim family sits ahead of the 2015 start of the search window but continues to draw citations through it.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6384126B1 | Binder formulation and use thereof in process for forming mineral pellets having both low and high temperatur… | 52 |
| 2 | US20110137444A1 | On-Line Optimization of Induration of Wet Iron Ore Pellets on a Moving Grate | 16 |
| 3 | WO2015018438A1 | Burner assembly and method for combustion of gaseous or liquid fuel | 15 |
| 4 | EP2330468A1 | On-line optimization of induration of wet iron ore pellets on a moving grate | 13 |
| 5 | WO1999024158A1 | Binder formulation used in forming mineral pellets | 13 |
| 6 | WO2022103893A1 | Method of iron electrode manufacture and articles and systems therefrom | 10 |
| 7 | US20120103134A1 | Process to produce manganese pellets from non-calcinated manganese ore and agglomerate obtained by this proce… | 9 |
| 8 | WO2010009527A1 | Process to produce manganese pellets from non-calcinated manganese ore and agglomerate obtained by this proce… | 9 |
| 9 | US20110143291A1 | Flue gas recirculation method and system for combustion systems | 8 |
| 10 | US20160201904A1 | Burner assembly and method for combustion of gaseous or liquid fuel | 7 |
Ranked by citation count within this searched corpus; older filings accumulate citations simply by having been public longer, so treat this as a signal of influence, not of current technical importance.
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Browse MCP servers →What the data tells a filing strategy
Three findings that shape where new claims can still land and which prior art blocks the obvious paths.
Activity peaked in 2021 and has since gone quiet
The filing growth figure of -100% between 2021 and 2024 is the steepest documented swing in the set. Because 2024 is the last year with complete publication data, this reflects a genuine pull-back in new filings rather than an artifact of the reporting lag that affects 2025-2026.
A short ranked list, no runaway leader
The ranking returns 15 organisations, with the leader holding 15 families and the fifth-place organisation holding 10. That gap between rank one and rank five is proportionally narrow compared with fields where a single filer dominates outright.
Battery-cell classification inside a furnace dataset
H01M (batteries, cells & fuel cells) covers 11.6% of the 86 records, on par with F23N combustion control. That overlap suggests induration process-control patents — temperature profiling, gas recirculation — are being drafted with claim language broad enough to also read on battery thermal processing.
Binder chemistry, not furnace hardware, holds the top citation count
The most-cited record in the set is a binder formulation patent, not a furnace design or control patent. That points to binder chemistry as a heavily referenced foundation that later furnace-control filings build on rather than compete with directly.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to pellet induration furnaces, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranked field spans mining majors, steelmakers, process-technology licensors and individual inventors. No organisation in the ranking shows growth in the most recent year — every assignee tracked for year-over-year momentum reports 0 filings in the latest year, consistent with the field-wide pull-back after 2021.
A single organisation holds the largest family count
The leading assignee's 15 families sit ahead of a fifth-place organisation at 10 and a tenth-place organisation at just 3 — a gradual taper rather than a cliff, meaning mid-ranked players still hold meaningful claim positions.
A cluster of process-technology and steel producers
Ranks two through five sit close together, consistent with a technology area shaped by licensors of grate-kiln and straight-grate process technology alongside integrated steel and iron-ore producers rather than one dominant patent holder.
Individual inventors co-file more than corporate teams
The strongest co-assignee link in the set is between two named individuals, ahead of any two corporate assignees — an indicator that some of the process-control innovation here originates from independent or academic inventors rather than in-house R&D groups.
| Assignee | Recent year | YoY |
|---|---|---|
| Luossavaara-Kiirunavaara AB (LKAB) | 0 | -100% |
| Vale SA | 0 | — |
| Tata Consultancy Services Ltd | 0 | — |
| Outotec (Finland) Oy | 0 | — |
| Form Energy Inc | 0 | — |
| Her Majesty the Queen in Right of Canada as represented by the Minister of Natural Resources Canada | 0 | — |
| PIRTLE JAMES | 0 | — |
| Tata Steel Ltd | 0 | — |
Where to take this analysis
The dataset points to open questions that a keyword search alone will not resolve.
Check freedom-to-operate on control-layer claims
Thermal profile and gas recirculation control patents sit across multiple IPC classes; a claim chart against the highest-cited records is the fastest way to see whether a new control scheme reads on existing art.
Run a claim comparisonTrack the H01M overlap
The battery-cell classification overlap is early but consistent across the set; monitoring new filings that straddle furnace control and cell thermal processing could flag a shift before it shows up in citation counts.
Set up monitoringMap the individual-inventor cluster
The strongest co-assignee pair in the set is two named individuals rather than a corporate team, worth investigating for licensing or acquisition targets outside the obvious corporate leaders.
Explore inventor networksCommon questions on pellet induration furnace patents
A pellet induration furnace hardens green iron-ore pellets through controlled heating stages, typically on a moving grate or in a grate-kiln configuration, so the pellets gain the compressive strength needed for blast furnace or direct-reduction feed. Patent activity concentrates on the process-control layer — thermal profile management, gas recirculation, dust carryover and refractory wear — rather than on the basic furnace mechanics, which are largely settled art. This dataset of 86 records reflects that split, with metal extraction and refining classification (C22B) covering over half of records alongside furnace and combustion hardware classes.
The ranking in this dataset lists 15 organisations, spanning mining companies, steel producers, process-technology licensors and individual inventors. The leading assignee holds 15 families, with the fifth-ranked organisation at 10 and the tenth at 3 — a gradual taper rather than one company holding an outsized share. No organisation tracked for recent-year momentum shows growth in the latest year, so leadership here reflects historical filing volume more than current activity.
Filing peaked at 10 records in 2021 and fell to 0 by 2024, the most recent year that can be treated as complete, giving a documented -100% swing over that span. Figures for 2025 and 2026 are still incomplete because publication typically lags filing by around 18 months, so the true trajectory for those years is not yet visible. Based on the complete data through 2024, activity has pulled back sharply from its 2021 peak.
US8571715B2 claims a system for optimizing induration furnace operation using an interactive control interface, a calibration means that generates ideal set points, and a processing unit that computes real-time set points and issues an optimizing signal when they diverge from the ideal. It is one of the most-cited records in this set, filed by Tata Consultancy Services Limited. New filings that use a different architecture for comparing real-time and target furnace parameters — for example, a machine-learning model replacing the fixed calibration means — may avoid its specific claim structure, but any close variant should be checked against it directly.
The clearest gaps sit in specific measurement and control sub-areas rather than in furnace hardware overall: preheat zone temperature modelling, gas recirculation ducting design, dust carryover capture at grate transitions, refractory wear sensing, and inline pellet compressive strength testing all show filing activity without a concentrated owner. The overlap between induration control classification and battery-cell classification (H01M, 11.6% of records) is also under-explored and worth tracking as a drafting opportunity.
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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.
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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.