Patent No. EP3445520 (titled "Aluminum Composite Material Having A Corrosion Protection Layer") was filed by Hydro Aluminium Rolled Products on Jan 4, 2017. The application was issued on Aug 28, 2019.

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 NEUF BRISACH | May 28, 2020 | CONSTELLIUM PROPRIETE INDUSTRIELLE |
| GRANGES | May 4, 2020 | VALEA |
| NOVELIS KOBLENZ | Mar 23, 2020 | WEICKMANN & WEICKMANN PARTMBB |
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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