Patent No. EP2938724 (titled "Culturing Of Human Embryonic Stem Cells At The Air-Liquid Interface For Differentiation Into Pancreatic Endocrine Cells") was filed by Janssen Biotech on Dec 18, 2013. The application was issued on Oct 28, 2020.

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 | Jul 23, 2021 | GAENTZSCH |
| ZWICKER SCHNAPPAUF & PARTNER | Jul 23, 2021 | ZWICKER |
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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