Low-Carbon Cement Patents: Top Companies & Filing Trends 2026
- Still accelerating, not maturing. filings ran from zero in 2017 to a peak of 4 in 2020, then climbed again toward 2026 rather than plateauing.
- Citation weight sits with older carbonate chemistry. US8114214B2 and US8062418B2, both on calcium carbonate methods and compositions, carry the heaviest citation counts in the corpus by a wide margin.
- Structural and separation-process integration is almost unclaimed. B01D and E04C each show just one record against 38 total families, leaving binder-to-structure integration largely open.
What this landscape covers
This landscape maps 38 patent families filed between 2015 and mid-2026 across low-carbon cement chemistry: limestone calcined clay systems, carbonate-activated binders and alkali-activated binders. The search is anchored on core cement classification C04B (cement, ceramics and refractories), with small spillovers into shaping processes, rare-earth and alkaline-earth compounds, separation processes and structural building components.
Filing activity has not settled into a steady rate: it moved from zero in 2017 to a peak of 4 families in 2020, then climbed again toward 2026 after a quiet 2022. Because publication trails filing by roughly 18 months, the true recent-year rate is understated in any trend line ending near the data cut-off.
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Filing trend and technology composition
The dataset covers 38 patent families published between 2015 and mid-2026, filtered to core low-carbon cement chemistry classes plus a handful of adjacent process classes.
Filings are still climbing, not plateauing
Filings sat at zero in 2017, rose to a peak of 4 in 2020, and the growth path from the 2022 midpoint of 0 to 2 filings by 2026 suggests the field is still in an accelerating phase rather than settling into a mature filing rate. Because publication lags filing by roughly 18 months, the most recent years understate actual filing activity.
Cement chemistry dominates; adjacent classes are thin
All 38 records touch C04B (ceramics, cement and refractories), confirming this is a tightly scoped cement-chemistry search. Only a handful of records extend into shaping processes (B29C, 3), alkaline-earth and rare-earth compounds (C01F, 3), separation processes (B01D, 1) or structural building components (E04C, 1) — those small counts are where claim space is least occupied.
Shares are the percentage of the 38 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Low-Carbon Cement Advanced Materials with Eureka
This page is one run against one query. Ask Eureka your own question about low-carbon cement advanced materials and every answer comes back with the patent numbers behind it.
Try EurekaThe records anchoring this landscape
CA2761840C — Portland limestone calcined clay cement (Aalborg Portland, 2017-08-22)
The present invention relates to a novel cement comprising Portland cement clinker and a supplementary cementitious material. The supplementary cementitious material comprises a heat treated clay material and an optionally heat treated carbonate material, wherein the clay material has been heat treated optionally together with the carbonate material in such a way that the heat treated clay material is substantially dehydroxylated while the optionally heat treated carbonate material remains substantially carbonated. This can be achieved by premixing the carbonate and clay materials before heat treating to 400-700 C, or heat treating the clay material separately to a temperature of up to 900 C.Filed by Aalborg Portland; part of the same family lineage as WO2010130511A1, the earliest limestone calcined clay filing in this corpus.
View full filing in Eureka| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US8114214B2 | Methods and compositions using calcium carbonate | 126 |
| 2 | US8062418B2 | Methods and compositions using calcium carbonate | 92 |
| 3 | WO2020146551A1 | Activation of natural pozzolan and use thereof | 26 |
| 4 | US8932400B2 | Methods and compositions using calcium carbonate | 23 |
| 5 | WO2010130511A1 | Portland limestone calcined clay cement | 21 |
| 6 | US10494298B1 | Cement-SCM compositions and methods and systems for their manufacture | 16 |
| 7 | US9212092B2 | Portland limestone calcined clay cement | 15 |
| 8 | EP2429966A1 | Portland limestone calcined clay cement | 12 |
| 9 | CN102459113A | 波特兰石灰石经煅烧的粘土水泥 | 10 |
| 10 | EP2429966B1 | Portland limestone calcined clay cement | 6 |
Ranked by citations received within this searched corpus; older filings accumulate citations naturally, so treat this as a map of influence, not of current filing activity.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Three patterns stand out once the 38 families are broken down by technology class, citation weight and filing year.
Growth has not plateaued
Filings rose from zero in 2017 to a peak of 4 in 2020, and with the 2022 midpoint back at zero followed by renewed filings toward 2026, the trend reads as accelerating rather than settling. Recent years are understated because publication lags filing by around 18 months.
Influence sits with older carbonate chemistry
The two most-cited records in the corpus both describe calcium carbonate methods and compositions, well ahead of the limestone calcined clay and pozzolan-activation families. High citation counts here reflect age and reference status within the corpus, not that this chemistry is the current filing focus.
Every record sits in core cement chemistry
All 38 families are classed under C04B, with only small spillovers into shaping (B29C, 3), rare-earth/alkaline-earth compounds (C01F, 3), separation (B01D, 1) and structural components (E04C, 1). Dense C04B coverage means binder composition claims are occupied; the adjacent classes are not.
Collaboration is limited and narrow
Only three co-assignee pairings appear in the data, and all three link the same three parties around one Aalborg Portland family. Most other filers in the recent-year momentum data, including Holcim's technology arm and academic filers, appear to be filing independently.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to low-carbon cement advanced materials, with the prior art for and against each one.
Who is filing, and where the gate sits
Filing in this dataset is led by a small group of cement producers and materials specialists, with a long tail of single-family academic and independent filers. Recent-year momentum is thin across the board, which is consistent with a field still working out its dominant chemistry.
Aalborg Portland
Holds the anchor limestone calcined clay cement family in this corpus, with claims tied to named inventors Herfort Duncan and Damtoft Jesper Sand and no recent-year filings shown in the current window.
Holcim Technology
Shows one filing in the most recent year covered, making it one of only two assignees with any recent-year activity in this dataset, alongside an academic filer.
Sri Venkateswara College of Engineering & Technology, Chittoor
The only academic institution shown with recent-year filing activity, matching Holcim Technology's single latest-year filing and suggesting research-side interest is keeping pace with industry in the newest cohort.
Calera Corporation (carbonate route)
Associated with the calcium carbonate methods and compositions family that carries the heaviest citation weight in the corpus, though it shows no recent-year filing activity in this dataset.
| Assignee | Recent year | YoY |
|---|---|---|
| Holcim Technology Ltd. | 1 | — |
| SRI VENKATESWARA COLLEGE OF ENGINEERING & TECHNOLOGY CHITTOOR | 1 | — |
| Aalborg Portland A/S | 0 | — |
| Roman Cement, LLC | 0 | — |
| Calera Corporation | 0 | — |
| Universiti Teknologi Malaysia | 0 | — |
| China Gezhouba Group Cement Co., Ltd. | 0 | — |
| HERFORT DUNCAN | 0 | — |
Where to take this analysis
The filing data points to two practical next steps for teams working in this space.
Check freedom to operate against CA2761840C
Before committing to a limestone calcined clay formulation, verify whether your process falls outside the claimed 400-700°C premix or up to 900°C separate heat-treatment windows.
Run an FTO check in EurekaTrack recent-year filers for follow-on activity
Holcim Technology and the Sri Venkateswara College of Engineering & Technology filing are the only two assignees active in the latest year; both are worth monitoring for a second filing that would confirm a sustained push.
Set up monitoring in EurekaCommon questions on low-carbon cement patents
Aalborg Portland is the clearest holder of foundational limestone calcined clay cement claims in this dataset, with both WO2010130511A1 and the related CA2761840C describing a Portland clinker blend with heat-treated clay and carbonate material. The co-assignee data ties named inventors Herfort Duncan and Damtoft Jesper Sand to this same family, indicating concentrated ownership rather than a broadly licensed technology. Anyone evaluating freedom to operate in this specific chemistry should start with this family's exact temperature and material-state limitations before assuming broader coverage.
The calcium carbonate family, led by US8114214B2 and US8062418B2, describes methods and compositions built around calcium carbonate as a reactive component and carries by far the highest citation counts in this corpus. Limestone calcined clay cement, by contrast, blends heat-treated (dehydroxylated) clay with a carbonate material that remains carbonated, and is claimed separately by Aalborg Portland. They are distinct compositional approaches that happen to share limestone-adjacent chemistry, so a product built on one does not automatically infringe the other.
Based on this dataset, the thinnest claim coverage sits outside the core C04B cement classes: only one record touches separation processes (B01D) and one touches structural building components (E04C), with shaping-of-plastics (B29C) only slightly better covered at three records. That suggests integration claims — tying a specific low-carbon binder composition to a defined structural component or manufacturing process — are less contested than the underlying binder chemistry itself. Filers looking for open ground should look at these integration points rather than trying to claim binder composition alone.
Yes, based on the filing trend in this dataset: activity was at zero in 2017, peaked at 4 filings in 2020, and shows renewed growth heading toward 2026 rather than a decline. Because patent publication typically lags actual filing by around 18 months, the last one to two years in any such trend will always look artificially low, so the true 2025-2026 filing rate is likely higher than shown. The overall trajectory across the period supports treating this as an active, not settled, filing area.
CA2761840C, assigned to Aalborg Portland, blocks cements combining Portland clinker with a supplementary cementitious material made of heat-treated clay and an optionally heat-treated carbonate material, produced either by premixing clay and carbonate before heating to 400-700°C or by heat-treating clay separately up to 900°C. It does not block SCM systems that skip the carbonate co-processing step entirely or that rely on different SCMs such as slag or fly ash. Companies developing calcined-clay cements should check their process temperatures and material combination sequence against this claim's specific parameters rather than assuming all calcined-clay work is covered.
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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.