In this dataset, the term covers pavement structures built for drainage (open-graded or porous asphalt), plus surfaces engineered for a specific function such as noise reduction, skid resistance, or winter anti-icing performance. Claims typically address either the physical layer structure — aggregate size, pore layout, drainage layers — or a functional treatment applied to that structure, such as an anti-icing gel or a noise-damping surface texture. The classification data confirms this is a road-engineering field first: over 80% of records sit in the roads-and-pavements IPC subclass, with material-science and sensing classes appearing far less often.

The ranked assignee list for this dataset includes 22 companies and institutions, headed by an organisation with 7 records. The gap to the field is not large — fifth place already holds 4 records, and by tenth place the count drops to 1 — so this is a fragmented field rather than one with an entrenched dominant filer. Filers include highway-research institutes, universities, and specialist materials or construction-technology companies, several of which recur together as co-assignees on the same filings.

The filing trend in this dataset peaked at 6 records in 2020 and has not shown a clean upward trajectory since. Because there are fewer than four complete years of data once the typical 18-month publication lag is accounted for, no reliable growth rate can be calculated from this evidence, and the most recent years should be read as undercounted rather than as a genuine slowdown. Anyone tracking this space should expect the 2024-2026 figures to rise as pending applications publish.

Relative to the dominant structural and layer-design claims, a few branches carry only one or two records each in this dataset: bio-based anti-icing formulations, pore-clogging detection and sensing, acoustic surface texturing, and binder-polymer compositions specific to porous mixes. These thin counts do not guarantee an area is unclaimed elsewhere, but they indicate the searched corpus has not concentrated claim density there, which makes them reasonable starting points for a freedom-to-operate check before drafting.

EP4159825A1 claims an anti-icing solution for open-graded or high-macro-texture asphalt pavements built from water, a freezing-point-lowering saline solute, and a bio-based gelling agent — specifically agarose and/or pectin — that reversibly shifts between liquid and gel states with temperature. It does not block anti-icing chemistry generally; it blocks this specific combination of thermo-reversible bio-based gelling agents with saline anti-freeze in a porous-pavement application. Alternative gelling chemistries, non-reversible formulations, or treatments aimed at dense (non-porous) pavements would sit outside its claim scope, though a full freedom-to-operate review should check the granted claim set rather than the abstract alone.