Patent No. EP3517539 (titled "Substituted Dimeric Quinazoline Derivative, Its Preparation And Its Use In Pharmaceutical Compositions For The Treatment Of Type I And Ii Diabetes") was filed by Boehringer Ingelheim on Jul 13, 2012. The application was issued on Dec 14, 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 |
|---|---|---|
| HAMM & WITTKOPP | Sep 14, 2023 | HAMM & WITTKOPP |
| KNPP PARTGMBB | Sep 14, 2023 | DR VOLGER |
| KNPP PARTGMBB | Sep 14, 2023 | VOLGER |
| MAIWALD | Sep 13, 2023 | MAIWALD |
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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