Cement & Clinker Patents: Top Companies & Filing Trends 2026
- 14.5% concentration at the top. The five most active filers together account for 2,297 of the 15,796 records in scope — a leadership cluster, not a single dominant player.
- Filing has cooled from its 2022 peak. Activity peaked at 801 records in 2022; from 2021 to 2024, the last fully comparable years, filings moved from 679 to 626, an 8% pullback.
- Kiln and furnace hardware is a distinct filing lane. Furnaces and kilns (F27B) and furnace details (F27D) together sit well behind core cement chemistry (C04B, 77.3% of records), marking process equipment as a separate, thinner claim space.
Filing growth compares 2021 (679 records) with 2024 (626) — 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 15,796 records in scope (CR5), not by the ranked leaders only.
What this dataset covers
This landscape draws on 15,796 published records filed between 2015 and the 2026 data cut-off, matched on cement and clinker production together with raw material, firing temperature, hydration reaction, compressive strength and pore structure terms. The scope spans chemistry claims on the cement itself and process claims on the kilns, crushers and separation equipment used to make it, so the ranking mixes formulation specialists with heavy-equipment suppliers.
Publication lags filing by roughly 18 months, so the last one or two years in any trend understate real activity. The receiving-office split shows the United States, China, Europe and Japan as the four largest jurisdictions, with WIPO PCT and Australia filings layered on top.
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 15,796 records: how filing volume has moved year over year, and how those records split across IPC subclasses.
Filing activity, 2017–2026
Filings rose from 389 in 2017 to a peak of 801 in 2022, then eased to 626 by 2024 — an 8% decline from 2021's 679. The 2025 and 2026 figures (down to 93 for the partial current year) are still filling in under publication lag and should not be read as a continued fall.
IPC subclass composition
C04B (ceramics, cement and refractories) covers 77.3% of the 15,796 records, confirming this as a chemistry-first field. Furnace and kiln hardware (F27B, F27D) and comminution/separation equipment (B02C, B01D) form smaller, more equipment-specific bands beneath it; a record can carry more than one class, so these shares sum to over 100%.
Shares are the percentage of the 15,796 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Cement & Clinker Patent Landscape with Eureka
This page is one run against one query. Ask Eureka your own question about cement & clinker patent landscape and every answer comes back with the patent numbers behind it.
Try EurekaA representative filing and the most-cited prior art
US9868666B2 — Cement clinker production system
Filed by Mitsubishi Ube Cement Corporation, this filing claims a clinker production system that couples mineraliser dosing (separate sulfur- and fluorine-source supply), raw material crushing, kiln burning and an in-line analysis loop that samples the mixed raw material both before and after burning.Published 2018-01-16.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5346012A | Fine particle size cement compositions and methods | 408 |
| 2 | US5125455A | Primary cementing | 366 |
| 3 | US5121795A | Squeeze cementing | 358 |
| 4 | US5127473A | Repair of microannuli and cement sheath | 320 |
| 5 | US5123487A | Repairing leaks in casings | 301 |
| 6 | US5888256A | Managed composition of waste-derived fuel | 238 |
| 7 | US20090020044A1 | Hydraulic cements comprising carbonate compound compositions | 235 |
| 8 | US5086850A | Well bore drilling direction changing method | 219 |
| 9 | US4268316A | Masonry cement composition | 217 |
| 10 | US5456751A | Particulate rubber included concrete compositions | 209 |
Citation counts favour older filings simply because they have had longer to accumulate them — read this table as a map of influential prior art, not of current filing strength.
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 data means for filing strategy
Three read-throughs from the concentration, trend and composition figures above.
Leadership is clustered, not singular
The top five assignees hold 2,297 of the 15,796 records in scope, 14.5% of the field, and the top ten extend that to 22.7% with 3,592 records. That leaves a long tail of filers below the tenth-place mark of 200 records, meaning most of the space is still contestable outside a small leadership cluster.
Volume has cooled from its 2022 peak, not collapsed
Filings peaked at 801 in 2022 and settled to 626 by 2024, an 8% pullback over the 2021–2024 span. That is a normalisation from a high point, not a structural retreat, and the falling figures for 2025–2026 reflect publication lag rather than a genuine slowdown.
Chemistry claims dominate, equipment claims are thinner
C04B alone touches 77.3% of records, confirming that most activity is cement and clinker chemistry rather than hardware. Kiln and furnace subclasses (F27B at 12.9%, F27D at 7.6%) and crushing/separation subclasses (B02C, B01D) are meaningfully smaller, pointing to less-crowded ground around process equipment.
Joint filings are rare and concentrated among a few pairs
Only ten co-assignee pairs appear in the dataset, with the strongest pairings linking cement producers to affiliated engineering or heavy-industry partners. This suggests most filers protect cement and clinker inventions independently rather than through joint ventures.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to cement & clinker patent landscape, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Taiheiyo Cement Corporation | Onoda Cement Co., Ltd. | 55 |
| Sumitomo Osaka Cement Co., Ltd. | Kawasaki Heavy Industries, Ltd. | 50 |
| Heidelberg Materials AG | HCONNECT 2 GMBH | 26 |
| Taiheiyo Cement Corporation | Taiheiyo Engineering Corporation | 25 |
| Lafarge | Creusot-Loire Industrie | 22 |
| W.R. Grace & Co.-Conn. | JARDINE LESLIE A | 21 |
| Lafarge | Solidia Technologies, Inc. | 21 |
| Taiheiyo Cement Corporation | Kawasaki Heavy Industries, Ltd. | 18 |
The strongest co-assignee pairs link cement producers to affiliated engineering or equipment partners, consistent with vertically integrated filing rather than open collaboration.
Who is filing, and where the gate is loosening
The ranked leaders sit atop a long tail: 200 records is enough to reach tenth place, so a handful of well-targeted filings can move a new entrant into contention.
A clear leader, not a runaway one
The top-ranked assignee holds 510 records against a fifth-place figure of 385 and a tenth-place figure of 200, a gradual step-down rather than a cliff. That shape points to several well-matched competitors rather than one company setting the entire agenda.
Recent-year filings are down across the board
Every assignee tracked for recent-year momentum shows a year-on-year decline, from a 78% drop at the most active of them to a full stop at others. Given the roughly 18-month publication lag, this pattern is expected in the most recent year and should not be read as retreat from the field.
The US, China, Europe and Japan carry the bulk of filings
The United States receives the most filings at 3,190, ahead of China at 1,764, Europe at 1,753 and Japan at 1,575, with WIPO PCT and Australia adding further volume. A filing strategy built around only one of these offices misses a large share of where protection is actually being sought.
| Assignee | Recent year | YoY |
|---|---|---|
| Holcim Technology Ltd | 4 | -78% |
| Sika Technology AG | 1 | -91% |
| Heidelberg Materials AG | 1 | -83% |
| Sumitomo Osaka Cement Co., Ltd. | 1 | -75% |
| FLSmidth & Co. A/S | 0 | — |
| Taiheiyo Cement Corporation | 0 | -100% |
| W.R. Grace & Co.-Conn. | 0 | — |
| Mitsubishi Materials Corporation | 0 | — |
Where to take this next
The figures above establish the shape of the field; the next steps depend on whether you are clearing a filing or scouting a gap.
Check a specific claim against this landscape
Run a freedom-to-operate check against the most-cited records and the representative filing before committing engineering resources to kiln or mineraliser process changes.
Explore in Patsnap EurekaTrack the leadership cluster's next moves
Set an alert on the top-ranked assignees' recent filings to catch shifts before the 18-month publication lag fully clears.
Explore in Patsnap EurekaScope the under-claimed branches
Use the gate chips above as a starting search set to test whether a specific hydration-additive or furnace-retrofit claim is genuinely open.
Explore in Patsnap EurekaCommon questions about cement and clinker patents
The dataset ranks 100 assignees by record count, with the top-ranked holder at 510 records and a gradual decline to 200 records at tenth place. The top five together hold 2,297 records, 14.5% of the 15,796 records in scope, which means leadership is shared among several major cement producers and materials suppliers rather than concentrated in one company. Below the top ten there is a long tail of filers with far fewer records each, so competitive position outside the leadership cluster is still very open.
Filings rose steadily through the late 2010s, peaked at 801 records in 2022, and eased to 626 by 2024, an 8% decline from 2021's 679. That is a pullback from a high point rather than a collapse in interest. The lower figures shown for 2025 and 2026 reflect publication lag, since it takes roughly 18 months for a filing to appear as a published record, so those recent years should not yet be read as a genuine downturn.
Core cement and clinker chemistry, classified under C04B, appears in 77.3% of the 15,796 records, making it by far the largest technology band. Furnace and kiln equipment (F27B, F27D) and material handling steps like crushing and separation (B02C, B01D) make up smaller, more specialised bands beneath it. Because a single record can carry multiple IPC classes, these shares add up to more than 100%, which is expected and simply reflects overlapping claims.
The equipment-adjacent branches sit well below the dense C04B chemistry core: furnace detail and accessory retrofits, in-line kiln analysis loops, and mineraliser dosing controls all show comparatively thin filing density relative to core cement formulation claims. Pore-structure-targeted hydration additives and comminution energy-recovery integration are similarly under-represented. These are reasonable starting points for a novelty search precisely because they sit adjacent to a crowded core rather than inside it.
The United States receives the most filings in this dataset at 3,190 records, followed by China at 1,764, Europe (EPO) at 1,753 and Japan at 1,575. WIPO's PCT route adds 1,045 filings and Australia a further 981. A filing or clearance strategy focused on only one of these offices will miss a substantial share of where protection is actually being pursued in this field.
Research Cement & Clinker Patent Landscape in depth with Eureka
Go past this page: query the whole cement & clinker patent landscape 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.