Patent No. EP2158315 (titled "Methods Of Modifying Antibodies, And Modified Antibodies With Improved Functional Properties") was filed by Esbatech on Jun 25, 2008. The application was issued on Mar 23, 2016.

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 |
|---|---|---|
| F HOFFMANN LA ROCHE | Dec 23, 2016 | MEWBURN ELLIS |
| VOSSIUS & PARTNER PATENTANWALTE RECHTSANWALTE MBB | Dec 23, 2016 | - |
| STRAWMAN | Dec 22, 2016 | VOSSIUS & PARTNER PATENTANWALTE RECHTSANWALTE MBB |
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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