Patent No. EP2356213 (titled "Stem Cell Aggregate Suspension Compositions And Methods For Differentiation Thereof") was filed by Viacyte on Nov 4, 2008. The application was issued on May 29, 2019.

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 |
|---|---|---|
| ZWICKER SCHNAPPAUF & PARTNER | Feb 28, 2020 | GAENTZSCH |
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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