Patent No. EP3882304 (titled "Resin Sheet") was filed by Sekisui Chemical on Jul 25, 2019. The application was issued on Dec 13, 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 |
|---|---|---|
| MCE TECHNICAL CENTER | Sep 13, 2024 | IPECUNIA |
| SIMONA | Sep 13, 2024 | ADVOTEC |
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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