Patent No. EP3676447 (titled "A Method To Produce A Paperboard, A Paperboard And A Corrugated Board") was filed by Stora Enso OYJ on Aug 30, 2018. The application was issued on Oct 11, 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 |
|---|---|---|
| BILLERUD AKTIEBOLAG PUBL | Jul 1, 2024 | KRANSELL & WENNBORG KB |
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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