Section & Structural Steel Rolling Patents: Who Leads 2026
Section and Structural Steel Rolling Patents: Mapping the Universal Beam Mill Field
One assignee dominates the ranking. the leader holds 42 records against a fifth-place count of just 7, a steep drop-off rather than a gradual taper. Filings rose from 2 in 2017 to a peak of 12 in 2018, then eased off across the rest of the window. With fewer than four complete years available once the publication lag is accounted for, no growth rate can be stated from this data — but the shape points to a technology whose core mechanical claims were staked out early rather than one still building momentum.
- 1NIPPON STEEL CORPORATION42
- 2KAWASAKI STEEL CORP31
- 3SUMITOMO METAL IND LTD26
- 4ARCELORMITTAL SA12
- 5NIPPON KOKAN KK7
See the full section and structural steel rolling 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 in section and structural steel rolling?
One assignee leads the ranked field with 42 records, well ahead of fifth place at 7 and tenth place at 3. That is a steep drop-off rather than a gradual taper, which typically indicates the leader built a dense position on core mill and pass-design claims over a long period. The ranking covers 17 companies in total, drawn from a set of 134 published records, so it should not be described as a top-50 or top-100 list — it is the complete ranked field the dataset returns.
Is patent filing activity in this field growing or declining?
Filings rose from 2 in 2017 to a peak of 12 in 2018 and have not returned to that level since, based on the trend through the 2026 data cut-off. Because publication typically lags filing by around 18 months, the most recent one or two years understate true activity and should be treated as provisional. With fewer than four complete years available once that lag is factored in, no reliable growth rate can be stated from this data.
What technology areas dominate the patent claims in this space?
Metal rolling mechanics, IPC class B21B, appears in 70.9% of the 134 records in scope, making it by far the largest single technology bucket. Heat treatment, coating and alloy composition classes each sit at or below roughly 9% of records, and sheet-metal working, non-ferrous treatment, casting and electroplating classes are thinner still. This tells a filer that the core contest is over pass sequence and mill configuration, not metallurgy.
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 Section and Structural Steel Rolling 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.