Patent No. EP3279363 (titled "High-Strength Cold-Rolled Steel Sheet Having Excellent Workability And Collision Characteristics And Having Tensile Strength Of 980 Mpa Or More, And Method For Producing Same") was filed by Kabushiki Kaisha Kobe Seiko SHO Kobe Steel on Mar 1, 2016. The application was issued on May 13, 2020.

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 | Feb 10, 2021 | 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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