Patent No. EP3488869 (titled "Composition For Solid Preparation Comprising Hydroxypropyl Methyl Cellulose, Solid Preparation, And Method For Producing The Same") was filed by Shin Etsu Chemical on Nov 23, 2018. The application was issued on Jan 28, 2026.

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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