Patent No. EP4261346 (titled "Production Of Paper- Or Linerboard") was filed by Billerud Aktiebolag Publ on Apr 14, 2022. The application was issued on Nov 27, 2024.

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 |
|---|---|---|
| STORA ENSO OYJ | Aug 27, 2025 | J A KEMP |
| VALMET | Aug 26, 2025 | TBK |
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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