Patent No. EP3631030 (titled "High-Strength Corrosion-Resistant 6Xxx Series Aluminum Alloys And Methods Of Making The Same") was filed by Novelis on May 25, 2018. The application was issued on Jun 29, 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 NEUF BRISACH | Mar 28, 2023 | CONSTELLIUM PROPRIETE INDUSTRIELLE |
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