Patent No. EP2305683 (titled "Pharmaceutical Dosage Form Comprising Oxycodone Hydrochloride Having Less Than 25 Ppm 14-Hydroxycodeinone") was filed by Euro Celtique on Mar 30, 2005. The application was issued on Sep 11, 2024.

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 |
|---|---|---|
| HOFFMANN EITLE | Oct 28, 2015 | HOFFMANN EITLE |
| SETNA | Oct 28, 2015 | BOULT WADE TENNANT |
| JAMES POOLE | Oct 27, 2015 | CARPMAELS & RANSFORD |
| ACINO PHARMA AG | Oct 26, 2015 | KRAUS & LEDERER PARTGMBB |
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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