This dataset ranks 100 assignees by patent family count across 295 records in scope, and the top-ranked assignee alone holds 40 records — well ahead of the fifth-ranked assignee at 14. The five leading assignees together account for 45.1% of all 295 records, and the leading ten account for 65.4%, which means a relatively small group of specialist wood-treatment companies controls most of the documented claim space. Anyone entering this field should expect to negotiate around, or design around, claims held by that leading group rather than a fragmented long tail.

Filing activity peaked at 34 records in 2020 and has since plateaued: 2021 and 2024, the last two years this dataset treats as complete, both recorded 9 filings, for 0% growth across that span. Filings from 2025 onward will rise somewhat as publication catches up, since publication typically lags filing by roughly 18 months, but the flat 2021–2024 trend is not itself an artefact of that lag. Treat the field as stable rather than expanding at present.

The dominant class is B27K, wood preservation, which appears in 72.9% of the 295 records in scope. Polymer compositions (C08L, 17.6%) and layered products and laminates (B32B, 10.8%) are the next most common, followed by a cluster of narrower classes — natural macromolecule derivatives, drying, catalysis, particle/fibre board and polymer processing — each appearing in roughly 7% to 10% of records. Because a single record can carry several IPC classes, these shares add up to more than 100% of the record total.

CA2533114C, assigned to Stora Enso, covers treating thermally modified wood with a hydrophobic sizing agent reactive with cellulose — specifically alkyl ketene dimers and alkenyl succinic acid anhydrides — to reduce water absorption after thermal modification. It is a process claim tied to a specific chemistry (AKD/ASA sizing agents) applied after thermal modification, not a claim over thermal modification itself. Anyone using a different class of hydrophobic treatment, or applying sizing at a different stage of the wood-modification process, sits outside the literal scope of this particular filing, though a full clearance review should check the claims text directly rather than relying on the abstract.

The clearest gaps sit in classes with low density relative to the dominant B27K wood-preservation class: particle and fibre board applications (B27N, 7.1% of records), polymer processing routes for modified wood (C08J, 7.1%), and drying-cycle technology (F26B, 9.8%) are all thinly claimed compared to the 72.9% density in core preservation chemistry. Furfurylation catalyst recovery and bio-based sizing agents for thermally modified wood are narrower technical routes that also appear underrepresented relative to the acetylation and thermal-modification core. These are reasonable starting points for a freedom-to-operate search, though thin density in a public dataset is not the same as confirmed freedom to operate.