Patent No. EP3889308 (titled "Hot-Dip Galvanized Steel Sheet Having Excellent Surface Appearance And Low-Temperature Bonding Brittleness") was filed by Posco on Nov 28, 2019. The application was issued on Dec 31, 2025.

Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
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