One assignee leads the ranked field with 63 of the 404 records in scope, a clear margin over fifth place at 16. Beyond the top ten, which together hold 49.0% of all records, the field spreads into a long tail of companies with only a handful of filings each. This pattern means competitive risk is concentrated at the very top rather than spread evenly, so a single-assignee search catches a meaningful share of relevant prior art but not most of it.

Metal casting under IPC class B22D covers 77.7% of the 404 records, while control-and-regulating class G05B covers only 3.2%. Because a record can carry multiple IPC classes, these figures are not mutually exclusive shares of one total; they show that most filings anchor on the casting hardware and metallurgy side even when they touch a control parameter like gate velocity. This suggests the sensing and feedback layer around the process is comparatively under-claimed relative to the mechanical process itself.

Filing rose from 5 records in 2017 to a peak of 15 in 2023, the highest year on record in this dataset. The years immediately after that peak, including the current partial year, look lower, but publication typically lags filing by around 18 months, so recent years are systematically undercounted. A reliable read on whether 2023 was a genuine peak or a mid-point will only be possible once 2024 and 2025 data mature.