Patent No. EP3572256 (titled "Door Beam") was filed by Kabushiki Kaisha Kobe Seiko SHO Kobe Steel on Apr 3, 2019. The application was issued on Jan 26, 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 |
|---|---|---|
| C TEC CONSTELLIUM TECHNOLOGY CENTER CONSTELLIUM SINGEN | Oct 24, 2022 | CONSTELLIUM PROPRIETE INDUSTRIELLE |
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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