Patent No. EP2688561 (titled "Transdermal Compositions Comprising An Active Agent Layer And An Active Agent Conversion Layer") was filed by Teikoku Pharma USA on Mar 22, 2012. The application was issued on Aug 22, 2018.

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 |
|---|---|---|
| MAIWALD | May 21, 2019 | MAIWALD |
| MAIWALD PATENT UND RECHTSANWALTSGESELLSCHAFT | May 21, 2019 | MAIWALD PATENT UND RECHTSANWALTSGESELLSCHAFT |
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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