This dataset ranks 96 companies by patent family count across 408 records. The leading assignee holds 85 records, well ahead of the fifth-place company at 20 and the tenth-place company at 12. Together the top five hold 60.0% of all 408 records and the top ten hold 78.7%, so the field is concentrated rather than fragmented, and any competitive or freedom-to-operate review should start with that small group before looking at the long tail.

Filings peaked in 2017 at 44 records and have declined since, falling 77% from 44 in 2021 to 10 in 2024, the most recent year with reliable coverage. Because publication typically lags filing by around 18 months, the 2025 and 2026 figures in the underlying data are still incomplete and should not be read as a continuation of the decline. A fair read is that the field's core chemistry has matured and is now being defended and refined rather than expanded rapidly.

The bulk of the claim activity is chemical: 72.3% of the 408 records classify under C08L (polymer compositions) and 42.2% under C08K (polymer additives), reflecting the emphasis on rejuvenators and binder modification packages. Roads-and-pavements classifications (E01C) appear in 30.6% of records and material-testing classifications (G01N) in 12.7%. Because records can carry multiple IPC classes, these percentages add up to more than 100%, and the practical takeaway is that formulation chemistry, not paving equipment or method, carries the densest prior art.

US20230365466A1, filed by Imam Abdulrahman Bin Faisal University and published 2023-11-16, describes rejuvenating reclaimed asphalt pavement by mixing it with oil sludge, an asphalt binder and aggregate at 100-200°C, then compacting the mixture. Its specific constraint is the oil sludge composition — 60-80 wt.% water, 10-30 wt.% sediments and 5-30 wt.% hydrocarbon oils. Work using a different rejuvenating agent, a different sludge composition, or a different temperature range would likely sit outside its literal claim scope, but any team using oil-sludge-based rejuvenation specifically should review the full claim set before proceeding.

The evidence points to a handful of comparatively thinner branches: stockpile variability correction methods, plant modification for high-RAP throughput, bio-based rejuvenator dosing, real-time stiffness monitoring at the plant, and cracking-resistance test protocols specific to high-RAP mixtures. These sit adjacent to the dense polymer-composition claim space (C08L at 72.3% of records) but draw on the roads-and-pavements (30.6%) and testing (12.7%) classes that show lower claim density. A first claim in these areas should tie a specific process parameter or test method to a measurable outcome rather than restating the general rejuvenation concept.