Patent No. EP2253216 (titled "Method Of Producing Filling Comprising Water-Soluble Cellulose Ether") was filed by Shin Etsu Chemical on May 19, 2010. The application was issued on Aug 8, 2018.

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 | May 3, 2019 | POLYPATENT BGL |
| INTERNATIONAL N&H DENMARK APS | May 3, 2019 | POLYPATENT BGL |
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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