Patent No. EP2837391 (titled "Hypromellose Acetate Succinate For Use As Hot-Melt Extrusion Carrier, Hot-Melt Extrusion Composition, And Method For Producing Hot-Melt Extrudate") was filed by Shin Etsu Chemical on Jul 29, 2014. The application was issued on May 10, 2017.

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 |
|---|---|---|
| HERCULES | Feb 12, 2018 | HOFFMANN EITLE |
| THE DOW CHEMICAL | Feb 5, 2018 | N&H EMEA |
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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