Patent No. EP2139515 (titled "Attenuated Viruses Useful For Vaccines") was filed by The Research Foundation OF The State University OF NEW York on Mar 31, 2008. The application was issued on Dec 20, 2023.

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 |
|---|---|---|
| MAIWALD PATENT UND RECHTSANWALTSGESELLSCHAFT | Mar 13, 2019 | LASAR |
| MAIWALD | Mar 13, 2019 | MAIWALD |
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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