Patent No. EP3400316 (titled "New 6Xxx Aluminum Alloys, And Methods Of Making The Same") was filed by Arconic on Dec 30, 2016. The application was issued on Aug 20, 2025.

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 |
|---|---|---|
| ALVANCE ALUMINIUM DUFFEL | Jun 15, 2021 | MULLER SCHUPFNER & PARTNER PATENT UND RECHTSANWALTSPARTNERSCHAFT MBB MUC |
| C TEC CONSTELLIUM TECHNOLOGY CENTER CONSTELLIUM NEUF BRISACH | Jun 10, 2021 | CONSTELLIUM PROPRIETE INDUSTRIELLE |
| NOVELIS | May 27, 2021 | 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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