Fluidized Bed Iron Ore Reduction Patents: Who Leads 2026
- One assignee dominates the founding art. The leading filer holds 58 records against a fifth-place count of 5, a gap that points to a small circle of process originators rather than a broad competitive field.
- Filing peaked in 2022, not the present. Activity built from zero in 2017 to 8 records in its peak year, and the 2026 count is a single partial-year filing still working through publication lag.
- Claims sit almost entirely in one IPC subclass. 93.9% of the 98 records in scope carry a C21B classification, with furnace hardware (F27B, F27D) and extraction chemistry (C22B) forming the secondary layers.
What the fluidized bed reduction patent record actually shows
Fluidized bed reduction of iron ore fines sits at the intersection of ironmaking and gas-solid process engineering: patents in this set combine claims on sticking and defluidization control, gas-solid contact and residence time, and pressurized operation of fine ore feed. The scope covers 98 published records from 2015 through the 2026 cut-off, spanning founding plant patents from the 1990s that are still the most-cited prior art in the field alongside recent filings on smelting-reduction integration.
The record set is small and old-heavy: a handful of assignees built the core plant and process claims decades ago, and later filers have mostly worked around or extended those positions rather than opening new ground. Reading the assignee concentration next to the IPC composition tells a reader where the occupied territory sits and where a fresh claim might still land.
Let an AI agent run this analysis on your own technology
Pick a task. Every answer cites the patents behind it.
Filing trend and technology composition
Two views of the same 98-record set: when filings happened, and which IPC subclasses they carry. Because a single record can carry several classes, the technology shares add up to more than 100% of the record total.
A peak in 2022, then a cooling filing trend
Filings rose from zero in 2017 to a peak of 8 in 2022, then eased off. The single record published so far in 2026 understates real filing activity for that year, since publication typically lags filing by around 18 months.
C21B carries almost the entire field
93.9% of the 98 records classify under C21B (iron production, blast furnace route), with F27B furnace/kiln hardware at 30.6% and C22B extraction chemistry at 29.6% forming the next layer. Smaller pockets in B01J catalysis and C10G hydrocarbon processing suggest occasional cross-over claims rather than a distinct sub-field.
Shares are the percentage of the 98 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Fluidized Bed Iron Ore Reduction with Eureka
This page is one run against one query. Ask Eureka your own question about fluidized bed iron ore reduction and every answer comes back with the patent numbers behind it.
Try EurekaThe founding art still shapes freedom to operate
US20250163525A1 — Method of reducing iron ore powder (JFE Steel Corporation, 2025-05-22)
The filing couples a fluidized bed reduction furnace with a downstream smelting reduction furnace, using separate first and second reducing gases across the two stages. It claims routing of fluidized bed top gas as part of a scheme aimed at cutting CO2 emissions while holding stable operation through condition fluctuations.Abstract condensed from the published filing; claim scope should be checked against the granted document.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5082251A | Plant and process for fluidized bed reduction of ore | 158 |
| 2 | US5192486A | Plant and process for fluidized bed reduction of ore | 74 |
| 3 | WO2003056039A1 | An apparatus and method for recycling dust and sludge containing iron in ironmaking process using coal and fi… | 40 |
| 4 | US5674308A | Spouted bed circulating fluidized bed direct reduction system and method | 40 |
| 5 | US5762681A | Fluidized bed type reduction apparatus for iron ores and method for reducing iron ores using the apparatus | 30 |
| 6 | US4334920A | Integrated process for thermal cracking of heavy oil and reduction of iron ores | 25 |
| 7 | US6585798B2 | Fluidized bed reactor for preventing the fine iron ore from sticking therein and method thereof | 21 |
| 8 | WO2001046478A2 | A fluidized bed reactor for preventing the fine iron ore from sticking therein and method therefor | 12 |
| 9 | US5897829A | Apparatus for reducing fine iron ore | 12 |
| 10 | US3276858A | Method for carrying out gas-solids reactions | 12 |
Citation counts favour older filings simply because they have had longer to accumulate citations inside this corpus — read them as a signal of influence on later designs, not as a ranking of current importance.
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 patterns worth acting on before drafting a new application in this space.
A small group of originators still holds the core plant art
The leading assignee's record count is more than ten times the fifth-place count. Combined with a strongest co-assignee pair count of 54 between two related entities, the evidence points to a tightly held cluster around the original plant and process patents rather than a fragmented field.
Activity has already passed its high point
Filings climbed from zero in 2017 to a peak of 8 in 2022 and have not returned to that level since. With growth not computable from the years remaining after publication lag, the safest reading is that the field's most active drafting period has already occurred.
Almost every record touches the same core class
C21B (blast-furnace-route iron production) appears in 93.9% of the 98 records in scope. Furnace hardware under F27B and F27D, and extraction chemistry under C22B, form secondary bands rather than independent territory — a new filing that avoids C21B language entirely is filing outside where the art actually sits.
Australia leads office-level filing counts
Australia's 20 filings lead the receiving-office count, ahead of the United States at 14 and the EPO at 13, with Canada and Japan each at 10. This spread suggests applicants have pursued protection across resource-producing and industrial markets rather than concentrating on a single jurisdiction.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to fluidized bed iron ore reduction, with the prior art for and against each one.
Who is filing, and where the momentum sits now
The assignee ranking covers 32 companies built from patent-family counts, not raw document counts, so continuation filings and multi-jurisdiction duplicates do not inflate any single position.
The founding plant-patent holder
The top-ranked assignee's count sits far above the rest of the ranking, consistent with its position behind the most-cited historical plant and process patents in this set. Its strongest co-assignee relationships account for two of the three highest-count pairs in the dataset.
A recent filing while established leaders go quiet
Nippon Steel is the only assignee among the tracked group with a filing recorded in the latest year; the leading historical assignees, including the top-ranked filer and its closest collaborators, show zero filings in that same year. That does not mean their programmes have stopped, since publication lag delays visibility of the newest work.
Filing has run through joint arrangements, not solo programmes
Ten co-assignee pairs appear in the dataset, with the three strongest all linking the top-ranked assignee to its closest institutional and industrial partners. A new entrant should expect that any freedom-to-operate search in this space will surface joint-owned families, not single-owner ones.
| Assignee | Recent year | YoY |
|---|---|---|
| Nippon Steel Corporation | 1 | — |
| POSCO | 0 | — |
| Research Institute of Industrial Science & Technology (RIST) | 0 | — |
| Voest Alpine AG | 0 | — |
| KIM HANG GOO | 0 | — |
| Kobe Steel, Ltd. | 0 | — |
| LEE IL OCK | 0 | — |
| JFE Steel Corporation | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, white-space drafting, or tracking a named competitor.
Check freedom-to-operate against the founding plant patents
The most-cited records in this set, several from the 1990s, still shape what later filings can claim around fluidized bed plant configuration and gas-solid contact. Any new filing should be checked against these before drafting.
Run a citation check in EurekaDraft into the under-claimed branches
Residence time distribution modelling and pressurized fine-ore feed systems carry lighter filing density than the core C21B claims. A first-mover claim there has more room than one filed directly against the dense core.
Explore white space in EurekaTrack the assignees still filing
With most historical leaders showing zero filings in the latest tracked year and Nippon Steel the exception, watching who resumes filing next is a leading indicator of where the field moves.
Set up assignee tracking in EurekaFrequently asked questions
A single assignee holds 58 records in this 98-record dataset, far ahead of the fifth-ranked filer's 5, indicating that the founding plant and process patents sit with one company and its closest institutional partners. The strongest co-assignee pairs in the data link that leader to two related entities, with pair counts of 54, 35 and 34. Newer entrants, including Nippon Steel with a filing in the most recent tracked year, are adding to the record but have not displaced the concentration at the top.
Filing rose from zero records in 2017 to a peak of 8 in 2022, and has not returned to that level in the years since. A precise growth rate cannot be stated because too few complete years remain once the roughly 18-month publication lag is accounted for. The practical takeaway is that the field's busiest drafting period has likely already passed, though the most recent years remain understated in any count.
C21B, the iron production and blast-furnace class, appears in 93.9% of the 98 records in scope and should anchor any search or classification review. F27B (furnaces and kilns) and C22B (metal extraction and refining) follow at 30.6% and 29.6% respectively, covering the hardware and downstream chemistry side of the same filings. Because records can carry multiple classes, these percentages overlap rather than sum to a whole field.
The dataset shows heavy concentration in blast-furnace-route iron production claims (C21B) and comparatively light coverage in specific process-control sub-areas, including sticking and defluidization sensor control, residence time distribution modelling, and pressurized fine-ore feed systems. These sit adjacent to the dense core rather than outside it, which means a workable first claim there still needs to be drafted narrowly around the specific control or feed mechanism rather than the general fluidized bed configuration. Checking the most-cited historical patents first is still necessary before drafting into any of these branches.
Australia leads with 20 filings in this dataset, ahead of the United States at 14 and the European Patent Office at 13. Canada and Japan each show 10, with Austria (AT) at 8. The spread across resource-producing and major industrial markets suggests applicants are protecting both the ore-processing regions and the equipment-manufacturing markets rather than filing narrowly in one jurisdiction.
Research Fluidized Bed Iron Ore Reduction in depth with Eureka
Go past this page: query the whole fluidized bed iron ore reduction 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.