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.

EP4219043A1 covers a two-stage vacuum process for high pressure die casting, reducing mould cavity pressure to a first vacuum stage once molten metal is in the shot sleeve, then to a second, deeper stage before cavity filling begins. It is narrow to that specific sequencing of vacuum stages relative to shot sleeve fill timing rather than to vacuum-assisted die casting generally. Work that applies a single vacuum stage, or times the reduction differently relative to shot sleeve loading, sits outside its literal claim scope, though a design-around should still be checked against the full claim set rather than the abstract alone.

The clearest gap sits between heavily claimed casting hardware (B22D at 77.7% of 404 records) and thinly claimed control systems (G05B at 3.2%), pointing to real-time gate velocity feedback, closed-loop intensification pressure regulation, and vacuum-stage sequencing as under-claimed sub-areas. Co-assignee filing is also rare, with only 10 pairs across the dataset, suggesting little cross-company collaboration has been captured in joint filings. Anyone filing new claims in the sensing or automation layer around an established casting process is filing into comparatively open ground, though a full search should confirm the gap holds outside this specific keyword scope.