The leading assignee in this dataset holds 22 of the 78 records in scope, well ahead of the fifth-ranked assignee at 6. The top five combined account for 69.2% of all records, and the top ten account for 91.0%, so filing activity is concentrated among a small group of materials and electronics suppliers rather than spread evenly. Beyond the ranked ten, the remaining assignees each hold only one or two records, forming a long tail of individual inventors and smaller entrants.

Filing activity peaked at 8 records in 2021 and fell to 0 by 2024, a documented -100% change across that three-year window, based on complete published data. Filings for 2025 and 2026 are still incomplete because publication typically lags filing by about 18 months, so it is too early to call the current trajectory a slowdown rather than a gap still filling in. Readers should treat any conclusion about the most recent one to two years as provisional.

H01L (semiconductor devices) is the largest class, covering 55.1% of the 78 records in scope, followed by H01B (cables, conductors & insulators) at 26.9%. Soldering-specific class B23K and glass/enamel class C03C each cover 19.2%, with alloy class C22C at 16.7% and dedicated photovoltaic class H02S at 15.4%. Because a single record can carry multiple IPC classes, these shares add up to more than 100% of the record total and should not be summed as if they were exclusive categories.