Patent No. EP3981594 (titled "Multilayer Tubular Structure With Improved Resistance To Extraction In The Bio-Essence And Use Thereof") was filed by Arkema France on Jan 12, 2017. The application was issued on Jan 29, 2025.

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 |
|---|---|---|
| EVONIK OPERATIONS | Oct 23, 2025 | F & E PATENT |
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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