Patent No. EP1844763 (titled "Percutaneously Absorbable Preparation, Percutaneously Absorbable Preparation Holding Sheet, And Percutaneously Absorbable Preparation Holding Equipment") was filed by Bioserentach on Jan 30, 2006. The application was issued on Sep 7, 2022.

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 |
|---|---|---|
| LEO PHARMA | May 8, 2019 | CARPMAELS & RANSFORD |
| COSMED PHARMACEUTICAL | May 2, 2019 | TER MEER STEINMEISTER & PARTNER |
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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