Electrogalvanized Steel Patents: Who Leads, Where the Gaps Are 2026
Electrogalvanized steel patents for automotive outer panels: filing trends and where the claim space is still open
64.6% of the field sits with five filers. 593 of 918 records in scope belong to the top five assignees, so most freedom-to-operate questions reduce to a small set of portfolios. Annual filings ran from 29 in 2017 up to a peak of 57 in 2019, then declined; the last complete three-year window shows a drop from 43 filings in 2021 to 9 in 2024, a 79% fall. 2025 and 2026 figures are still filling in as publications catch up to filing dates, so they should not be read as confirmation the decline continues.
- 1JFE STEEL CORP198
- 2NIPPON STEEL CORPORATION159
- 3PPG INDUSTRIES OHIO INC111
- 4NIHON PARKERIZING CO LTD83
- 5KAWASAKI STEEL CORP42
See the full electrogalvanized steel for automotive outer panels 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 electrogalvanized steel for automotive outer panels?
A small group of steelmakers and surface-treatment suppliers dominates the field: the top five assignees together hold 593 of the 918 records in scope, or 64.6%. The leading filer alone accounts for 198 records, well ahead of the fifth-place filer’s 42. This concentration means that most competitive or licensing questions in this space come down to reviewing a handful of large portfolios rather than scanning the whole field.
Is patent filing activity in electrogalvanized steel growing or shrinking?
Filings peaked at 57 in 2019 and have since declined; the last complete three-year window shows a drop from 43 filings in 2021 to 9 in 2024, a 79% decrease. Figures for 2025 and 2026 are still incomplete because publication typically lags filing by about 18 months, so the true recent trend is understated in the raw numbers. A slowdown in new filing does not necessarily mean less R&D activity — it can also reflect consolidation among established players or a shift toward process know-how kept as trade secret.
What technology areas get the most patent claims in this field?
Coating and surface deposition (IPC class C23C) appears in 50.9% of the 918 records, and electroplating and electroforming (C25D) in 27.7%, making these the two most heavily claimed aspects of the process. Coatings, paints and inks (C09D) and layered products (B32B) also carry meaningful shares, reflecting active claiming around topcoat chemistry and multilayer panel constructions. Condensation polymer chemistry (C08G) is comparatively thin at 4.8%, which is worth checking as a possible under-claimed area.
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 Electrogalvanized Steel for Automotive Outer Panels 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.