Across the 4,968 records in this dataset, the leading assignee holds 176 records, with the top five assignees combined holding 704 records — 14.2% of the total. That leadership is real but not overwhelming: the drop from first to fifth place is gradual rather than steep, and the top ten together account for only 24.5% of all records. The remaining three-quarters of filings are spread across a long tail of smaller assignees, including several academic and research-institute filers.

Filing peaked at 281 records in 2017 and has since pulled back; using the most recent years with complete publication data, filings fell 41% from 190 in 2021 to 113 in 2024. That is a genuine multi-year decline in filing volume, not a data artefact. Figures for 2025 and 2026 should be read as provisional, since publication typically lags filing by around 18 months and those years will revise upward as more records surface.

US4560723A, granted in 1985 to Minnesota Mining & Manufacturing Company, claims cyanoacrylate adhesive compositions that combine a toughener — a core-shell copolymer such as MBS, ABS, or MABS types — with a compatible sustainer compound such as diphenylmethane, to retain toughness after heat aging. The patent is long expired, so it no longer blocks new filings directly, but its claim structure remains a common reference point when drafting toughened cyanoacrylate formulation claims and assessing what counts as novel over the early art.