Patent No. EP1755674 (titled "Prolongation Of Survival Of An Allograft By Inhibiting Complement Activity") was filed by Alexion Pharmaceuticals on May 16, 2005. The application was issued on Nov 19, 2014.

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 CHUGAI PHARMACEUTICAL | Aug 18, 2015 | TESCHEMACHER |
| NOVARTIS | Aug 14, 2015 | 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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