One assignee leads the ranked field with 154 records, well ahead of the fifth-place holder at 49 and the tenth-place holder at 13. This is a steep concentration at the top rather than a gradual tail, so due-diligence work on this technology should start with that leader’s portfolio before moving down the ranking. The ranking covers 66 companies in total, counted by patent family, and is the complete list the dataset returns rather than a top-50 or top-100 cut.

The great majority of records claim alloy composition: C22C accounts for 76.8% of the 504 records in scope, covering systems such as copper-cobalt-nickel-silicon and copper-zirconium-chromium formulations. C22F, non-ferrous metal treatment, follows at 56.7%, covering the ageing and rolling schedules that set strength-conductivity balance. Downstream application classes — semiconductor devices, connectors, conductors — appear less often, and surface-finish claims under C25D sit at just 10.5%, marking it as comparatively less crowded.

Filings peaked at 28 in 2018 and the only span in this dataset that can be treated as complete, 2021 to 2024, shows a 50% decline from 8 to 4. Because publication lags filing by roughly 18 months, years after 2024 are still filling in and should not be read as a stop in activity. The honest read is a cooling from a 2018 peak, not a currently accelerating field.