Patent No. EP4165223 (titled "Method Of Manufacturing An Aluminium Alloy Plate For Vacuum Chamber Elements") was filed by Aleris Rolled Products Germany on Jun 7, 2021. The application was issued on Nov 13, 2024.

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 ISSOIRE CONSTELLIUM VALAIS | Jul 22, 2025 | CONSTELLIUM PROPRIETE INDUSTRIELLE |
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