Patent No. EP1492505 (titled "Pharmaceutical Preparation Containing Oxycodone And Naloxone") was filed by Euro Celtique on Apr 4, 2003. The application was issued on Jun 3, 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 |
|---|---|---|
| DEVELCO PHARMA SCHWEIZ | Mar 3, 2016 | TER MEER UND PARTNER |
| FRKELLY | Mar 3, 2016 | KELLY |
| KRKA | Mar 3, 2016 | HOFFMANN EITLE |
| STADA ARZNEIMITTEL | Mar 3, 2016 | KERNEBECK |
| ZENTIVA KS | Mar 3, 2016 | HOFFMANN EITLE |
| ETHYPHARM | Mar 2, 2016 | REGIMBEAU |
| G L PHARMA | Mar 2, 2016 | KESCHMANN |
| HEXAL SANDOZ | Mar 2, 2016 | WIBBELMANN |
| TEVA PHARMACEUTICAL INDUSTRIES LTD | Feb 24, 2016 | D YOUNG |
| ACINO PHARMA AG | Feb 12, 2016 | BREUER |
| ACTAVIS GROUP PTC EHF | Dec 11, 2015 | GILLARD |
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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