Patent No. EP2275443 (titled "Antigen-Binding Molecule Capable Of Binding To Two Or More Antigen Molecules Repeatedly") was filed by Chugai Seiyaku Kabushiki Kaisha on Apr 10, 2009. The application was issued on Dec 2, 2015.

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 |
|---|---|---|
| ABLYNX | Sep 2, 2016 | HOFFMANN EITLE |
| ALEXION PHARMACEUTICALS | Sep 2, 2016 | J A KEMP |
| STRAWMAN | Sep 2, 2016 | SPILLER |
| GLAXO GROUP | Sep 1, 2016 | WILSON |
| JAMES POOLE | Sep 1, 2016 | 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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