Patent No. EP1673452 (titled "Method For Large-Scale Production Of A Polypeptide In Eukaryote Cells And A Culture Vessel Suitable Therefor") was filed by Novo Nordisk Health Care on Oct 6, 2004. The application was issued on Dec 23, 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 |
|---|---|---|
| BAXALTA | Sep 23, 2016 | HOFFMANN EITLE |
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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