Patent No. EP1799196 (titled "Controlled Release Pharmaceutical Compositions Comprising A Fumaric Acid Ester") was filed by Aditech Pharma on Oct 7, 2005. The application was issued on Jun 22, 2016.

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 |
|---|---|---|
| PENTAFARMA | Mar 22, 2017 | PATENTREE |
| KELTIE | Mar 21, 2017 | D YOUNG |
| STRAWMAN | Mar 21, 2017 | GILL JENNINGS & EVERY |
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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