Concrete Admixture Patents: Leaders, Trends & White Space 2026
- Filing has cooled since its 2021 peak. 140 families in 2021 fell toward 105 by the 2022 midpoint, and the partial 2026 count sits well below that — a market consolidating claim space rather than expanding it.
- China dominates the filing office count. 1,086 of the tracked records were filed in China, more than the next four offices (US, Japan, EPO, South Korea) combined.
- The largest Chinese filers went to zero last year. Several of the most active assignees, including groups with strong co-filing ties to their own subsidiaries, show 0 filings and a -100% YoY change in the latest tracked year.
Filing growth compares 2021 (140 records) with 2024 (109) — 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 2,038 records in scope (CR5), not by the ranked leaders only.
What the concrete admixture patent record shows
Concrete admixture and superplasticizer patents cluster tightly around cement chemistry rather than the polymer science that makes modern superplasticizers work. Of 2,038 tracked families, 2,026 touch IPC class C04B (ceramics, cement and refractories), while only 592 reach into C08F addition-polymer claims and fewer still into C08G condensation chemistry. That imbalance matters for anyone drafting new claims: the cement-side art is dense and well-cited, but the polymer architectures behind polycarboxylate ether (PCE) performance are comparatively thin.
Filing activity rose through the late 2010s, peaked in 2021, and has since drifted down through a flat-to-declining midpoint year. Because publication typically lags filing by around eighteen months, the most recent year understates real activity — but the multi-year decline from peak is a distinct signal, not an artefact of the lag alone.
Filing trend and technology composition
The two views below cover volume over time and the technical classes carrying that volume. Read them together: a shrinking filing curve on top of an IPC mix skewed almost entirely to one subclass tells you where the crowding is, and where it isn't.
Filings peaked in 2021, then declined
From 97 families in 2017 to a peak of 140 in 2021, the curve turns down through 2022 (105) and continues lower into the partial 2026 count — consistent with a technology area that expanded, then consolidated around incumbent formulations.
Cement chemistry dominates the IPC mix
C04B appears in all but a handful of records. C08F, the addition-polymer class that covers much PCE backbone chemistry, appears in under a third of families, and condensation polymers (C08G), polymer compositions (C08L) and mixing/shaping equipment (B28C, B28B) each account for a small minority — evidence of concentrated claim density in cement formulation and comparatively open ground in polymer architecture and processing equipment.
Shares are the percentage of the 2,038 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
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Try EurekaThe documents anchoring this landscape
Concrete admixture and production method
A method of enhancing efficiency of a batching and/or mixing process for a concrete cementitious composition, adding an admixture containing dispersant molecules that bind very rapidly with cement particles to provide a dispersing effect and initial slump that diminishes rapidly. The multi-component system layers an ultrafast dispersant for initial slump, a general water-reducing dispersant for workability, and a latent dispersant copolymer for extended performance.Filed by Construction Research & Technology GmbH, published 2015-12-03.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4961790A | Concrete admixture device and method of using same | 183 |
| 2 | US6352952B1 | Admixture and method for optimizing addition of EO/PO superplasticizer to concrete containing smectite clay-c… | 166 |
| 3 | US5614017A | Cement additives | 149 |
| 4 | US5494516A | Workable cementitious compositions | 142 |
| 5 | US5609681A | Workable cementitious compositions | 132 |
| 6 | US5224595A | Package of cement mixing material | 115 |
| 7 | US5362324A | Zero slump – loss superplasticizer | 111 |
| 8 | WO1998058887A1 | Admixture and method for optimizing addition of EO/po superplasticizer to concrete containing smectite clay-c… | 102 |
| 9 | JP1998081549A | Concrete admixture | 86 |
| 10 | US5352290A | Concrete composition | 83 |
Citation counts favour older filings inside any searched corpus — they signal influence on later drafting, not current commercial relevance.
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Three patterns stand out once volume, geography and citation data are read side by side: where claim density sits, who is still active, and which older documents still shape drafting.
Cement-side claims are nearly universal
Almost every family in this corpus touches C04B, meaning cement formulation claim space is thoroughly mapped. New filings that stay purely in cement chemistry are drafting into the densest part of the art.
China anchors the filing base
China's receiving-office count exceeds the next four offices combined, reflecting both a large domestic construction sector and dense local competition among admixture producers.
Leading assignees have gone quiet
Several of the historically most active filers, including groups with tight co-assignee relationships to their own subsidiaries, show zero filings in the latest tracked year. That does not mean exit — publication lag alone can explain part of this — but it is a marked change from the 2021 peak.
Foundational documents are decades old
The most-cited records in this corpus date to the 1990s and early 2000s. They anchor prior-art search but describe an earlier generation of admixture chemistry than current PCE-based formulations.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to concrete admixtures and superplasticizers, with the prior art for and against each one.
Assignee concentration and where the gaps sit
Filing activity concentrates among a small group of Chinese specialty-admixture producers and their subsidiaries, alongside established multinational cement and construction-chemical firms. Co-assignee pairs mostly link a parent group to a regional manufacturing subsidiary rather than joint ventures between unrelated competitors.
Parent-subsidiary filing is the norm
The strongest co-assignee relationships link a group entity to its own regional manufacturing subsidiary, a pattern consistent with centralized R&D and distributed production rather than cross-company collaboration.
A pause among the largest filers
Assignees that built the largest historical portfolios in this space show no filings in the most recent tracked year. Combined with the post-2021 downturn in overall volume, this points to a maturing rather than expanding competitive set.
Filing strategy is regionally uneven
Beyond China's dominant share, the US, Japan and Europe each carry over a hundred filings, while South Korea and India trail well behind — a gap that may reflect market size rather than technical interest.
| Assignee | Recent year | YoY |
|---|---|---|
| Kezhijie New Material Group Co., Ltd. | 0 | -100% |
| Denka Company Limited | 0 | — |
| W.R. Grace & Co. | 0 | — |
| Jiangsu Sobute New Materials Co., Ltd. | 0 | -100% |
| Mapei S.p.A. | 0 | — |
| Lafarge | 0 | — |
| Taiheiyo Cement Corporation | 0 | — |
| Silk Road C&T Co., Ltd. | 0 | — |
Where to take this analysis
The trend and composition data point to specific next questions for R&D and IP teams working in this space.
Map the polymer-side white space
With C08F and C08G coverage far below C04B, a focused search on polycarboxylate ether backbone and side-chain claims is likely to surface less-crowded ground than another cement-formulation filing.
Explore polymer claim spaceVerify the post-2021 decline isn't just publication lag
Confirm whether the drop from the 2021 peak reflects genuine reduced R&D investment or is partly an artefact of the roughly 18-month gap between filing and publication.
Check recent filing activityTrack the quiet incumbents
Several of the largest historical filers show zero activity in the latest year. Set an alert for their next filing to see whether they resume at the prior pace or have shifted strategy.
Monitor assignee activityCommon questions about concrete admixture patents
Filing activity in this corpus concentrates among Chinese specialty-admixture manufacturers and their regional subsidiaries, alongside established multinational cement and construction-chemical companies. The strongest co-assignee relationships link a parent group to its own manufacturing subsidiary rather than joint ventures between separate competitors. Several of the historically most active filers show zero activity in the most recent tracked year, so the current leaderboard may not reflect who is actively filing today.
The tracked filing count peaked at 140 families in 2021 and has drifted down since, with the 2022 midpoint at 105 and lower counts into the partial most recent year. Part of that recent-year dip is expected because publication lags filing by roughly eighteen months, so the newest year is always undercounted. But the multi-year decline from the 2021 peak, together with several top assignees showing -100% year-over-year filing, suggests genuine consolidation rather than a lag artefact alone.
Cement and refractory chemistry, IPC class C04B, appears in nearly all 2,038 tracked families, making it the densest part of the art. Addition-polymer claims (C08F) appear in under a third of records, and condensation-polymer, polymer-composition and mixing-equipment classes each cover a small minority. A new filing that competes purely on cement formulation is entering the most contested ground; polymer architecture and mixing/dosing equipment carry visibly lower density.
The IPC data shows a sharp drop-off from cement chemistry (C04B, near-universal coverage) to the polymer classes that define PCE backbone and side-chain design (C08F and C08G, covering well under a third of records). That gap suggests claims tied to specific dispersant copolymer architectures, staged or latent-release mechanisms, and shrinkage-reduction combinations are less thoroughly covered than formulation-level cement claims. Equipment classes for mixing and staged dosing (B28C, B28B) are similarly thin.
The most-cited records in this corpus date from the 1990s through early 2000s, led by a concrete admixture device and method patent and several cementitious-composition patents covering workable compositions and EO/PO superplasticizer optimization. These citation counts reflect decades of accumulated influence on later drafting, not current commercial dominance, since citation counts in any searched corpus structurally favour older filings. Modern PCE-based formulations are typically newer and less cited simply because they haven't had as long to accumulate citations.
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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.