In this dataset the two terms are treated as closely related dewatering outcomes rather than distinct legal categories, both defined by the underflow density and yield stress achieved at the thickener. Claims typically distinguish them by the degree of dewatering and the resulting rheology, with paste tailings sitting at a higher yield stress and lower water content than thickened tailings. Filings tend to claim the process and control method — flocculant dosage, rake torque, underflow density — rather than the tailings product itself, which is why search strings combining both terms alongside process variables return a coherent single field rather than two separate ones.

The assignee ranking covers 42 companies, with filing activity concentrated sharply at the top: the leading assignee holds 29 of the 184 records in scope, more than double the fifth-placed filer's 13. The top five assignees combined account for 48.9% of all records, and the top ten account for 77.7%, meaning most of the remaining 32 companies in the ranking hold only a handful of filings each. Most of the leading filers are oil sands operators and specialty chemicals companies, reflecting the field's roots in oil sands tailings management.

Filing peaked in 2019 at 11 records and has since flattened rather than continued growing: the count held at 2 filings in both 2021 and 2024, a 0% change over that three-year span. That is consistent with a mature filing base rather than an emerging one, though the very latest years (2025–2026) are understated because publication typically lags filing by roughly 18 months. Anyone assessing momentum should treat the last one to two years in any chart as provisional rather than a sign of decline.

Water and wastewater treatment (IPC class C02F) is the largest single class, appearing in 45.7% of the 184 records in scope, followed by separation processes including filtration (B01D) at 36.4%. Hydrocarbon oils and refining (C10G) appears in 26.6% of records, tying much of the field to oil sands processing specifically, while ceramics and cement (C04B) and flotation (B03D) each cover meaningful but smaller shares. Metal extraction and refining (C22B) is comparatively thin at 7.1%, marking it as a less-claimed branch relative to the dewatering-focused classes.

The technology composition data shows metal extraction integration (C22B, 7.1% of records) and specific control mechanisms like beach slope angle and rake torque monitoring appearing far less often than the dominant water-treatment and separation classes. That thinner density does not guarantee an easy filing path, since foundational oil sands filings from the early 2000s and 2010s carry heavy citation weight and broad claim language. A practical next step is a targeted freedom-to-operate search in those specific sub-areas before drafting, rather than assuming thin IPC coverage means an open field.