Patent No. EP4065331 (titled "Method For Production Of Articles And Semi-Finished Products Made Of Cellulose Acetate") was filed by HC on Nov 10, 2020. The application was issued on Jun 28, 2023.

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 |
|---|---|---|
| MAZZUCCHELLI | Mar 28, 2024 | FAGGIONI |
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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