The ranked field covers 100 companies, with one assignee holding 42 records outright and a clear step down to fifth place at 17 records and tenth place at 11. The top 5 assignees combined account for 132 of the 415 records in scope, or 31.8%, and the top 10 extend that to 194 records, or 46.7%. Beyond the top 10, filing activity spreads across a long tail of companies with far fewer records each, so a full competitive picture requires looking past the leaders alone.

Filing activity grew sharply through the middle of the tracked period, rising from 18 records in 2021 to 40 in 2024, a +122% increase, with a peak of 43 records in 2023. Counts for 2025 and 2026 appear lower, but that reflects the roughly 18-month lag between when a patent is filed and when it publishes, not an actual decline. Any conclusion about a slowdown should wait until those later years have had time to fully publish.

Most records classify under H01L (semiconductor devices, 70.4% of the 415 records) and H10W (47.5%), reflecting that most claims describe the compound as used within a package. Smaller but meaningful shares fall under C08L polymer compositions (22.4%), C08K additive systems (16.1%), C08G condensation polymers (14.2%), H05K circuit assemblies (14.2%), H10P (8.4%) and B29C plastics shaping (6.7%). Because records often carry multiple IPC classes, these percentages add up to more than 100% of the record total and should be read individually rather than summed.

The formulation side of the field, particularly filler-additive systems under C08K and polymer-composition claims under C08L, carries a noticeably smaller share of the 415 records than the package-level H01L classification. Specific process controls named in the search scope, such as spiral flow optimization, moisture sensitivity level reduction and mold-cleaning formulations, also show less density than device-level claims. These are reasonable starting points for a freedom-to-operate check, though a targeted search of the current dataset is still needed to confirm what is genuinely open at the time of filing.

US20080045632A1, filed by Cheil Industries, claims a specific method for preparing epoxy molding compound powder that uses dry ice chips ground together with epoxy molding compound chips to prevent blocking and preserve flowability of the resulting powder. It does not claim epoxy molding compound formulations generally, so it does not block work on the compound's chemistry or on other packaging applications. Anyone using a dry-ice or similar co-grinding step specifically to control powder flowability and blocking should review this filing's claim scope and consider alternative grinding or anti-blocking methods that fall outside its specific process steps.