Aluminium Cast House Patents: Who Leads, Where the Gaps Are 2026
- 76.5% concentration. The top 5 assignees combined account for 834 of the 1,090 records in scope — a field where the leading position is dominant rather than contested.
- Filing has cooled from its peak. 2018 was the high-water year at 178 records; filings ran 162 in 2021 and 51 in 2024, a -69% move over that span, though 2025-2026 counts are still filling in.
- Casting and treatment classes dominate. C22C (alloys) and C22F (non-ferrous treatment) each cover roughly half of all records, while B22D (metal casting) sits near a fifth — the claim space is concentrated in composition and heat treatment, not casting hardware.
Filing growth compares 2021 (162 records) with 2024 (51) — 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 1,090 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Aluminium cast house operations sit at the point where molten metal is conditioned, filtered and solidified before it becomes billet, slab or ingot. This landscape tracks the patent activity around that stage: inline degassing, ceramic foam filtration, grain refiner addition, hot top and direct chill casting, and the homogenization heat treatment that follows. The search combines cast house process terms with the specific unit operations that define modern practice, rather than the broader alloy chemistry literature.
The scope spans 2015 through the 2026 data cut-off, drawing on 1,090 published records assigned to a ranked field of 100 companies. Because publication trails filing by roughly 18 months, the most recent one to two years in any trend understate real activity.
Filing trend and technology composition
Two views of the same 1,090 records: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
Filings rose to a 2018 peak, then pulled back
Annual filings climbed from 54 in 2017 to a peak of 178 in 2018, then eased through the following years — 162 in 2021 down to 51 in 2024, a -69% move over that three-year span. Treat 2025 and 2026 as still filling in rather than as evidence of a further decline, since publication lags filing by roughly 18 months.
Alloy composition and treatment classes dominate
C22C (alloys) appears on 50.5% of the 1,090 records and C22F (non-ferrous metal treatment) on 43.4%, making composition and post-cast treatment the densest claim territory. B22D (metal casting equipment and process) covers 21.7%, with B32B, C23C, B21B, C21D and C22B each present on a single-digit-to-low-teens share. A record can carry more than one class, so these shares sum to well over 100%.
Shares are the percentage of the 1,090 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Aluminium Cast House Operations with Eureka
This page is one run against one query. Ask Eureka your own question about aluminium cast house operations and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this space
US11577305B2 — System, apparatus, and method for direct chill casting venting
Provided herein is a system, apparatus, and method for venting a direct chill casting mold by venting excess casting gas and retaining oxide from atop a casting during the direct chill casting process. Methods of venting casting gas from a direct chill casting mold include: supplying the direct chill casting mold with molten metal through a transition plate; supplying a casting gas through a casting surface of the direct chill casting mold; venting the casting gas from a gas pocket in the transition plate, wherein venting the casting gas from the gas pocket in the transition plate is performed in response to a pressure of the casting gas in the gas pocket reaching a predetermined pressure.Filed by Wagstaff, Inc., granted 2023-02-14 — illustrates how mold-level gas management is still being actively claimed even as broader casting classes mature.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4157728A | Process for direct chill casting of metals | 120 |
| 2 | US20050043189A1 | Lubricant for improved surface quality of cast aluminum and method | 117 |
| 3 | US4287755A | Probes for the ultrasonic treatment or inspection of molten aluminum | 61 |
| 4 | US4277281A | Continuous filter for molten copper | 57 |
| 5 | US5415220A | Direct chill casting of aluminum-lithium alloys under salt cover | 55 |
| 6 | US3990922A | Processing aluminum alloys | 38 |
| 7 | US20070138239A1 | Method of joining heat-treatable aluminum alloy members by friction stir welding and joined product obtained … | 37 |
| 8 | US20080102404A1 | Aluminum alloy plate and support for lithographic printing plate | 36 |
| 9 | US20060219568A1 | Microstructure | 35 |
| 10 | US20190194780A1 | Aluminum alloy articles having improved bond durability and inert surface aluminum alloy articles and methods… | 32 |
Citation counts reward older filings that have had more time to accumulate references — read them as a signal of influence on the field, not of current filing activity.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns worth weighing before committing R&D or IP spend to this space.
The top of the field is dominant, not just leading
The top 5 assignees combined account for 834 of the 1,090 records in scope, and the top 10 push that to 84.2%. A single leader holds 728 records outright. New entrants are not filing into a fragmented field — they are filing around a small number of very dense portfolios.
Activity has pulled back from its 2018 peak
Filings peaked at 178 in 2018 and have since declined through 2021's 162 to 51 in 2024, a documented -69% move. That does not mean the technology is exhausted — dense filing in earlier years may simply have occupied the obvious claim space, pushing new filers toward narrower or adjacent territory.
Composition claims outweigh casting-hardware claims
C22C and C22F together cover roughly half of all records each, while B22D (the casting process/equipment class most directly tied to cast house hardware) sits at 21.7%. The heavier claim density is in alloy composition and post-cast treatment, which is where freedom-to-operate searches should concentrate first.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to aluminium cast house operations, with the prior art for and against each one.
Who is filing, and where the activity has slowed
Recent-year momentum shows even the largest assignees pulling back sharply from earlier filing rates, consistent with the field-wide decline off the 2018 peak.
One assignee holds the largest single share
The leading assignee's 728 records outweigh the combined total of the remaining ranked field several times over, concentrating both prior art risk and licensing leverage in one place.
Even the leader is filing far less than before
The top assignee shows only 2 filings in the latest year against a much higher prior run rate, a -91% year-over-year move. Several other ranked assignees show zero filings in the latest year, though publication lag means this understates true recent activity.
Cross-filing is concentrated in a handful of pairs
Ten co-assignee pairs appear in the data; the strongest links one major producer to a research institute, at 17 joint records. This points to sustained academic-industry collaboration rather than broad cross-licensing across the field.
| Assignee | Recent year | YoY |
|---|---|---|
| Novelis Inc. | 2 | -91% |
| Novelis Koblenz GmbH | 2 | 0% |
| Wagstaff, Inc. | 1 | -50% |
| Alcoa Inc. | 0 | — |
| Fujifilm Corporation | 0 | — |
| Southwire Company, LLC | 0 | — |
| Pohang Iron & Steel Co., Ltd. (POSCO) | 0 | — |
| Kobe Steel, Ltd. | 0 | — |
Where to take this next
The landscape points to next steps for both filing strategy and technical scoping.
Map freedom-to-operate against the top 10
With 84.2% of records held by ten assignees, a targeted FTO review of that group's claims in C22C and C22F will surface most of the relevant prior art before broader searching is needed.
Explore assignee claims in EurekaScope the under-claimed branches
Ceramic foam filter regeneration and inline grain refiner dosing show thinner filing density than the core casting classes, suggesting room for narrowly drafted claims rather than broad process patents.
Run a white space search in EurekaTrack post-2024 filings as they publish
Because publication lags filing by roughly 18 months, 2025-2026 activity will keep revising upward. Re-running this search periodically will show whether the pullback from the 2018 peak is a plateau or a genuine decline.
Set up monitoring in EurekaCommon questions about this landscape
One assignee holds 728 of the 1,090 records in scope, making it the clear leader by a wide margin. The top 5 assignees together account for 76.5% of all records, and the top 10 reach 84.2%. This is a field where a small number of portfolios cover most of the claim space, so any competitive or licensing analysis should start with that group rather than the long tail of single-filing entrants.
Filing peaked in 2018 at 178 records and has since declined, with 2021's 162 falling to 51 by 2024 — a documented -69% move over that three-year span. Figures for 2025 and 2026 are still incomplete because publication typically lags filing by around 18 months, so it is too early to call the recent years a continued decline rather than a data gap. Treat 2024 as the most recent year with a reasonably complete count.
Alloy composition (IPC class C22C) appears on 50.5% of the 1,090 records, and non-ferrous metal treatment (C22F) on 43.4%, making these the two densest claim areas. Metal casting process and equipment (B22D) covers 21.7% of records — meaningful, but well behind composition and treatment. Because a single record can carry multiple IPC classes, these percentages overlap rather than sum to 100%.
US11577305B2, assigned to Wagstaff, Inc. and granted in February 2023, covers a system and method for venting casting gas from a direct chill casting mold, specifically through a transition plate with a gas pocket that vents once pressure reaches a set threshold. It is a mold-level gas management mechanism, not a broad claim over direct chill casting itself. Anyone designing venting systems for DC casting molds should review its specific transition-plate and pressure-threshold limitations before assuming a workaround is needed.
Sub-areas adjacent to the dense C22C, C22F and B22D clusters show thinner filing density in this dataset, including ceramic foam filter regeneration methods, inline grain refiner dosing control, and hydrogen content sensing at the launder. These are narrower process-control and consumable-management niches rather than core alloy or casting-hardware claims. A first claim in these areas would likely need to be drafted tightly around a specific sensing, dosing or regeneration mechanism rather than the broader unit operation, given how occupied the surrounding claim space already is.
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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.