Silicon and Ferroalloy Smelting Patents: Leaders & White Space 2026
- 40.2% concentration. The top 5 of 615 records in scope sit with a small group of assignees, while a long tail files once or twice.
- +129% filing growth. Annual filings rose from 7 in 2021 to 16 in 2024, even as the overall peak year (2017, 55 filings) sits earlier in the window.
- C01B dominates classification. 45.2% of the 615 records carry a C01B non-metallic elements & inorganic compounds class — well ahead of batteries, furnaces or alloys.
Filing growth compares 2021 (7 records) with 2024 (16) — 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 615 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This landscape draws on 615 published records filed between 2015 and 2026 that reference ferroalloy smelting, submerged arc furnace operation, or metallurgical grade silicon alongside process-level detail such as electrode paste composition, furnace burden mix, silica fume recovery, tapping practice, carbothermic reduction or slag-free operation. The scope spans both the reduction furnace hardware side of the process and the downstream materials it feeds — batteries, semiconductors and alloys all show up in the classification data because metallurgical grade silicon is an input to each.
Publication lags filing by roughly 18 months, so the most recent one to two years in any trend understate real activity. Treat 2024 as the last year with a reasonably complete picture; 2025 and 2026 are still filling in.
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Filing trend and technology composition
Two views of the same 615 records: how filing activity has moved year over year, and how those records classify across IPC subclasses.
Filing activity, 2017-2026
Filings peaked at 55 in 2017 and have not returned to that level since, but the recent trajectory is upward: 7 filings in 2021 climbed to 16 in 2024, a 129% increase over that three-year span. 2025 and 2026 figures are still incomplete due to publication lag and should not be read as a slowdown.
Technology composition by IPC subclass
C01B (non-metallic elements & inorganic compounds) appears on 45.2% of the 615 records, confirming that core silicon chemistry claims dominate the corpus. Battery-related H01M classification (14.1%) and semiconductor-related H01L classification (9.9%) both trail well behind, and furnace hardware itself (F27B, 9.3%) is a smaller share than the reduction chemistry it supports. Because records can carry multiple classes, these shares sum to more than 100% of the 615 records.
Shares are the percentage of the 615 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Silicon and Ferroalloy Smelting with Eureka
This page is one run against one query. Ask Eureka your own question about silicon and ferroalloy smelting and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
US5281739A — Process for manufacture of alkylhalosilanes
The present invention is an improvement of the Direct Process for the manufacture of alkylhalosilanes by the contact of powdered metallurgical grade silicon with an alkyl halide in the presence of a copper catalyst. The improvement reduces lot-to-lot variations in silicon conversion to desired dialkyldihalosilanes. The improvement comprises alloying 0.01 to nine weight percent copper with the silicon to be used in the process and separating slag. In a preferred embodiment of the present process, silicon-copper alloy is pulverized to a powder and mixed with additional copper and other catalysts to form a contact mass reactive with alkylhalides.Filed by Dow Corning; a foundational claim on alloying copper into metallurgical grade silicon feedstock ahead of the Direct Process.
View full record| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20140227548A1 | Nanoparticles, Compositions, Manufacture and Applications | 268 |
| 2 | US4676967A | High purity silane and silicon production | 252 |
| 3 | US20090239151A1 | Non-aqueous electrolyte secondary battery, negative electrode material, and making method | 194 |
| 4 | US4340574A | Process for the production of ultrahigh purity silane with recycle from separation columns | 162 |
| 5 | US4124410A | Silicon solar cells with low-cost substrates | 95 |
| 6 | US4193975A | Process for the production of improved refined metallurgical silicon | 93 |
| 7 | US20100266902A1 | Negative electrode material for rechargeable battery with nonaqueous electrolyte, negative electrode for rech… | 84 |
| 8 | US4575856A | Iron free self baking electrode | 68 |
| 9 | US9765271B2 | Nanoparticles, compositions, manufacture and applications | 59 |
| 10 | US4802919A | Method for processing oxidic materials in metallurgical waste | 58 |
Citation counts inside this corpus skew toward older filings and should be read as a signal of influence rather than current 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 say
Four data points that shape where to file next and who to watch.
Filing sits with a small group
The top 5 assignees account for 247 of the 615 records in scope, 40.2% of the total, while the leader alone holds 67 records. The top 10 extends that to 334 records, 54.3% of the field, after which the ranking thins into single- and double-digit filers.
Activity is rebuilding after 2017's peak
Annual filings fell well below the 2017 peak of 55 before climbing again: 7 filings in 2021 rose to 16 in 2024. That three-year growth run suggests renewed interest in the underlying process chemistry rather than a technology in decline.
Core silicon chemistry dominates
C01B classification appears on 278 of the 615 records. Downstream applications — batteries (H01M, 14.1%), semiconductors (H01L, 9.9%) and alloys (C22C, 9.8%) — are all present but secondary to the core reduction and purification chemistry.
Filing offices skew toward the US and Europe
The United States (114 records) and the European Patent Office (92) lead receiving offices, ahead of China (76), WIPO/PCT (66), India (53) and Canada (33). That spread points to a field still filed defensively across multiple major jurisdictions rather than concentrated in one.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to silicon and ferroalloy smelting, with the prior art for and against each one.
Who holds the claim space, and where it's thin
The ranked leaders combine specialty silicon chemistry producers, ferroalloy operators and furnace equipment makers. Around them sits a long tail of single-record filers, several of which are Chinese ferroalloy plants filing narrowly on their own process lines.
A single assignee leads the field
The top-ranked assignee holds 67 of the 615 records, well ahead of fifth place at 23 and tenth place at 13 — a steep drop-off that marks this as a concentrated but not monopolised field.
Co-assignee activity is limited but focused
Only 10 co-assignee pairs appear in the dataset. The strongest pairing links two silicon chemistry specialists at 9 shared records; the next strongest pairs involve a ferroalloy producer and named individual inventors at 5 records each.
Established leaders show no latest-year activity
None of the six most active named assignees show filings in the latest year of the dataset. Given the roughly 18-month publication lag, this is most likely a reporting gap rather than an actual pause, but it means recent-year leadership in the field is currently unassigned in the data.
| Assignee | Recent year | YoY |
|---|---|---|
| Dow Silicones Corporation | 0 | — |
| Elkem | 0 | — |
| Shin-Etsu Chemical Co., Ltd. | 0 | — |
| Epro Development Limited | 0 | — |
| Union Carbide Corporation | 0 | — |
| Alabama Power Company | 0 | — |
| Italghisa S.p.A. | 0 | — |
| Tata Steel Limited | 0 | — |
Where to take this
Use the landscape to narrow the next step, whether that's a freedom-to-operate check or a first-claim draft.
Check freedom to operate against the leader's 67 records
With 40.2% of the field held by the top 5 assignees, any new filing in core reduction chemistry should be checked against the leading assignee's portfolio before drafting claims.
Run a freedom-to-operate checkDraft into the under-claimed branches
Silica fume recovery, slag-free tapping and burden mix optimisation carry comparatively few records relative to the dense C01B and H05B classes — a narrower window to secure a first claim.
Explore white space with Patsnap EurekaCommon questions on this landscape
Of the 615 records in this dataset, one assignee leads with 67 records, well ahead of the fifth-ranked assignee at 23 and the tenth-ranked at 13. The top 5 assignees together hold 247 records, 40.2% of the full 615-record set, and the top 10 extend that to 334 records, or 54.3%. Beyond that point the ranking thins quickly into a long tail of assignees with only one or two records each, so the field is concentrated at the top but not dominated by a single monopoly holder.
Filing activity peaked in 2017 at 55 records and has not returned to that level since, but the more recent trend is upward rather than declining: annual filings rose from 7 in 2021 to 16 in 2024, a 129% increase over that span. Figures for 2025 and 2026 look lower only because publication typically lags actual filing by around 18 months, so those years are still incomplete in the data. Read the 2021-2024 growth as the more reliable current signal.
Core silicon and inorganic chemistry, classified under IPC subclass C01B, appears on 278 of the 615 records, or 45.2% — by far the largest single classification. Electric heating and furnace-related classifications (H05B, 12.2%; F27B, 9.3%) cover the reduction hardware side, while battery (H01M, 14.1%), semiconductor (H01L, 9.9%) and alloy (C22C, 9.8%) classifications reflect that metallurgical grade silicon feeds those downstream industries. Because a single record can carry multiple IPC classes, these percentages add up to more than 100% of the record total.
The classification data shows core reduction chemistry (C01B) and furnace heating (H05B) carrying the largest share of the 615 records, which means claim space there is comparatively occupied. Adjacent process-specific areas named in the search scope — silica fume recovery, slag-free tapping practice, electrode paste formulation and furnace burden mix optimisation — show up far less often in the classification breakdown, suggesting these operational details are less thoroughly claimed. That does not guarantee an easy grant, but it does mean less prior art sits directly on those specific process steps.
The United States receives the most filings in this dataset at 114 records, followed by the European Patent Office at 92 and China at 76. WIPO/PCT filings account for 66 records, with India at 53 and Canada at 33. This spread across major offices suggests applicants in this field tend to seek protection in multiple jurisdictions rather than concentrating on a single home market, consistent with a technology that feeds globally traded silicon and ferroalloy products.
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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.