Patent No. EP2105135 (titled "Pharmaceutical Compositions For Treating Cancer") was filed by Celgene on May 16, 2003. The application was issued on Oct 22, 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 |
|---|---|---|
| ACCORD HEALTHCARE | Jul 22, 2015 | CABINET PLASSERAUD |
| GENERICS UK TRADING MYLAN | Jul 21, 2015 | GILLARD |
| HEXAL | Jul 21, 2015 | TER MEER UND PARTNER |
| I P S INTELLECTUAL PROPERTY SERVICES | Jul 20, 2015 | CASALONGA |
| SYNTHON | Jul 17, 2015 | PRINS |
| ACTAVIS GROUP PTC EHF | Jul 14, 2015 | HAMM&WITTKOPP PATENTANWÄLTE PARTMBB |
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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