This dataset of 58 patent families does not show a single dominant assignee; filing is spread across a long tail of companies, universities and individual co-filers rather than concentrated at the top. The University of Illinois board of trustees is the only tracked assignee with a filing in the most recent year, but that is a single record, not a sustained lead. Anyone assessing competitive position should look at citation weight and IPC concentration alongside raw assignee counts, since no one filer currently controls the core claim space.

Both terms appear in the search criteria defining this dataset, but they represent distinct technical routes: calcined clay cement blends thermally activated clay into clinker to cut CO2-intensive cement content, while geopolymer binders replace Portland clinker chemistry entirely with alkali-activated aluminosilicate reactions. The patent record classifies almost all activity in both routes under the same core IPC class, C04B, which means a novelty search for either route needs to search the whole class rather than a narrower geopolymer-specific code. Treat them as separate technical routes with overlapping but not identical prior art.

Patent applications are typically published around 18 months after filing, so any record from the most recent one to two years is still working its way through the publication pipeline at the time a search is run. In this dataset, the 2026 count of 4 is a partial-year figure taken from a corpus with a mid-2026 cut-off, and it will rise as later publications catch up. The correct way to read a trend chart is by its shape over the preceding years, not by the final bar's absolute height.

The classification data points to several under-claimed branches: calcined clay activation methods, geopolymer binder curing control, CO2 mineralisation of slag, low-clinker blend ratio optimisation and carbonatization process monitoring all sit in secondary IPC classes carrying only two to four records each, compared with the 58 records concentrated in the core cement class. That thinness does not guarantee an easy grant, but it does mean a claim drafted specifically around one of these process or monitoring angles faces less directly on-point prior art than a claim filed squarely in general cement composition. A proper clearance search is still required before relying on this as a filing strategy.

The five most-cited records in this corpus concern calcium carbonate compositions and blended cement, with citation counts ranging from 92 to 149 — substantially higher than typical records in the dataset. These are older filings, and their citation weight reflects long exposure in the field rather than current commercial dominance, but any new claim touching composition chemistry involving calcium carbonate or blended cement should be checked against them specifically. Newer filings on calcined clay, geopolymer or carbonatization-based supplementary cementitious material, such as the 2023 filing from HSUSTAINABILITY GMBH, build on top of this older base rather than replacing it.