Patent No. EP1838891 (titled "High Strength Sheet Made From Al-Zn-Cu-Mg Alloy With Low Internal Stresses") was filed by Alcan Rhenalu on Dec 9, 2005. The application was issued on Dec 9, 2015.

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 |
|---|---|---|
| ALCOA | Sep 9, 2016 | LENZING GERBER STUTE |
| ALERIS ROLLED PRODUCTS GERMANY | Sep 2, 2016 | MULLER SCHUPFNER & PARTNER PATENT UND RECHTSANWALTSPARTNERSCHAFT MBB MUC |
| WITTMANN | Aug 30, 2016 | FLEUCHAUS |
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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