Patent No. EP2516156 (titled "A Paper Or Paperboard Substrate, A Process For Production Of The Substrate And A Package Formed Of The Substrate") was filed by Stora Enso OYJ on Dec 20, 2010. The application was issued on Mar 20, 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.
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