Continuous Hot Dip Galvanizing Line Patents: Who Leads and Where the Claims Sit
Concentrated at the top. The five leading assignees hold 41.2% of all 1,059 records in scope, and the top ten hold 59.7% — this is a field with a short list of gatekeepers, not a fragmented one. Annual output climbed to a peak of 70 records in 2019, then fell across the following years; the -62% drop from 39 records in 2021 to 15 in 2024 is the clearest complete-year signal, since 2025 and 2026 are still filling in under normal publication lag.
- 1JFE STEEL CORP125
- 2TATA STEEL IJMUIDEN BV106
- 3NIPPON STEEL CORPORATION85
- 4KAWASAKI STEEL CORP67
- 5MITSUBISHI HEAVY IND LTD53
See the full continuous hot dip galvanizing lines 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 about this landscape
Who holds the most patents on continuous hot dip galvanizing lines?
Ownership is concentrated: the leading assignee holds 125 records, and the five leading assignees together account for 41.2% of the 1,059 records in this dataset. The top ten extend that to 59.7%. The leaders are a mix of established steelmakers and heavy-industry equipment builders, and the drop-off from the top few names to the rest of the ranked 100 companies is steep rather than gradual, so a small group effectively sets the claim environment for the whole field.
Is patent filing in this field growing or shrinking?
Filing peaked at 70 records in 2019 and has declined since, with a documented -62% drop from 39 records in 2021 to 15 in 2024. That 2021-2024 window is the most reliable recent signal because publication typically lags filing by around 18 months, so 2025 and 2026 figures are still incomplete and should not be read as a continuation of decline or a sign of recovery either way.
What technology areas get the most patent claims in galvanizing lines?
Coating and surface deposition, IPC class C23C, appears in 69.3% of the 1,059 records, making it by far the most heavily claimed area. Heat treatment (C21D) follows at 30.1% and alloy composition (C22C) at 17.5%. Control and regulating systems (G05B) sit at only 3.4%, which is a much lower share than the metallurgical classes despite automation being central to modern line operation.
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 Continuous Hot Dip Galvanizing Lines 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.