It is precast concrete cured by exposing fresh concrete to carbon dioxide gas rather than relying solely on water and time. During curing, calcium compounds in the cement react with CO2 to form stable calcium carbonate minerals, which both speeds curing and permanently locks captured carbon into the finished product. The process is applied mainly in precast settings such as concrete blocks and panels, where curing conditions can be controlled in a chamber. It is distinct from carbon capture at a power plant; here the concrete itself is the sink.

The assignee ranking in this landscape covers 34 companies and institutions, with the top-ranked assignee alone holding 21 of the 59 records in scope. The five leading assignees together hold 52.5% of all records, and the ten leading assignees hold 69.5%, meaning the field is fairly concentrated at the top with a long tail of single- or double-filing organisations, including universities and regional cement producers. This is not an exhaustive list of every company working in the space, only those captured by the underlying search and classification scope.

Recorded filings rose from 4 in 2021 to 9 in 2024, a growth of 125% over that three-year span, with 2024 standing as the peak year captured so far. Because patent publication typically lags actual filing by about 18 months, the 2025 and 2026 figures in this dataset are still incomplete and will rise as more applications publish. Readers should treat the recent apparent flattening as a data artefact rather than evidence that filing activity is slowing.

C04B, the cement, ceramics and refractories classification, covers 81.4% of the 59 records, making it by far the dominant claim area — most inventive activity is framed around the chemistry of the cured product itself. Shaping and forming equipment (B28B) and structural building components (E04C) trail well behind at 15.3% and 8.5% respectively, and separation, mixing, catalysis and waste-disposal classes each sit under 7%. That gap suggests curing-equipment design and structural integration are comparatively under-claimed relative to the underlying binder chemistry.

The thinnest classification counts relative to the dominant C04B cluster point to curing-chamber CO2 dosing control, carbonation curing of steel-slag-derived binders, post-carbonation structural qualification testing, and CO2 capture-to-curing integration hubs. These branches each carry only a handful of records against the 59 in scope, which does not guarantee they are unclaimed elsewhere but does indicate less crowding within this dataset. Any first claim in these areas should still be checked against the leading assignee's existing portfolio, since broad process claims there could still reach into adjacent equipment design.