Patent No. EP3153318 (titled "Heat-Shrinkable Multilayer Film") was filed by Kureha on Apr 28, 2014. The application was issued on Dec 2, 2020.

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 |
|---|---|---|
| ISARPATENT PATENT UND RECHTSANWALTE BARTH CHARLES HASSA PECKMANN UND PARTNER MBB | Sep 2, 2021 | ISARPATENT |
| CRYOVAC | Jun 2, 2021 | UEXKULL & STOLBERG |
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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