Patent No. EP3228552 (titled "Composite Package, And Package Laminate And Package Jacket Blank For A Composite Package") was filed by SIG Technology on Apr 4, 2016. The application was issued on Mar 27, 2019.

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.
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.