Patent No. EP3733918 (titled "Zinc Alloy Plated Steel Material Having Excellent Corrosion Resistance After Being Processed And Method For Manufacturing Same") was filed by Posco on Dec 13, 2018. The application was issued on Aug 31, 2022.

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.
| Company | Opposition Date | Representative |
|---|---|---|
| ARCELORMITTAL | May 30, 2023 | LAVOIX |
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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