Patent No. EP3228315 (titled "Prevention Of Adverse Effects Caused By Cd3 Specific Binding Domains") was filed by Amgen Research Munich on Oct 27, 2011. The application was issued on Nov 25, 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 |
|---|---|---|
| F HOFFMANN LA ROCHE | Aug 24, 2021 | MEWBURN ELLIS |
| JAMES POOLE | Aug 24, 2021 | CARPMAELS & RANSFORD |
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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