Patent No. EP3309179 (titled "Hydroxyalkyl Alkyl Cellulose, Method For Producing The Same, And Solid Preparation") was filed by Shin Etsu Chemical on Oct 6, 2017. The application was issued on Feb 23, 2022.

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 |
|---|---|---|
| DUPONT NUTRITION BIOSCIENCES APS | Nov 23, 2022 | 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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