Dimensional Control of Large Castings: Patents Behind Fixture Design and Thermal Growth Compensation
48.1% concentration at the top. The five leading assignees hold 52 of 108 records in scope — a field where a small group of filers already occupies the core fixturing and clamping claims. Filings rose from a single record in 2017 to a peak of 11 in 2021, then eased to 8 by 2024 — a -27% move over that three-year span. 2025 and 2026 are still under-counted because publication typically lags filing by around 18 months, so the apparent tail-off should not be read as the field going quiet.
- 1STMICROELECTRONICS INC13
- 2LUCIFER LIGHTING CO11
- 3THE PENN STATE RES FOUND INC11
- 4RJR POLYMERS INC10
- 5SICHUAN FUTURE AEROSPACE IND LLC7
See the full dimensional control of large castings analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on this landscape
Who holds the most patents on dimensional control of large castings?
The ranked leader in this dataset holds 13 of the 108 records in scope, ahead of a fifth-place holder at 7 and a tenth-place holder at 3. The top five assignees combined account for 52 records, or 48.1% of the field, so filing is concentrated but not held by a single company. The ranking covers 62 assignees in total, which is the complete set the data returns rather than a top-50 or top-100 cut.
Is patent filing in this area growing or slowing down?
Filing rose from 1 record in 2017 to a peak of 11 in 2021, then eased to 8 by 2024, a -27% change over that three-year span. 2024 is the most recent year that can be treated as complete, because publication typically lags filing by around 18 months, so 2025 and 2026 figures will keep rising as more filings publish. Read the recent apparent drop as an artifact of that lag rather than confirmed evidence the field has slowed.
What technology areas dominate the patent claims in this field?
Machine tool fittings (B23Q) lead at 25.0% of all 108 records, ahead of lighting device components (F21V) at 14.8% and a tied pair of welding/brazing (B23K) and semiconductor devices (H01L) at 13.9% each. Because a single record can carry several IPC classes, these percentages add up to more than 100% of the record total and describe claim density per subclass rather than a breakdown of the whole field. The dominance of B23Q indicates that fixture and tooling mechanics, not casting metallurgy, carry the heaviest claim load in this search set.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Dimensional Control of Large Castings covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.