Patent No. EP3658203 (titled "Drug Delivery Device With Gear Module And Related Method Of Assembly") was filed by Amgen on Jul 11, 2018. The application was issued on Oct 1, 2025.

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 |
|---|---|---|
| HOFFMANN EITLE | May 31, 2023 | VAN BOUWELEN |
| YPSOMED | May 30, 2023 | DIRIX |
| YPSOMED | May 30, 2023 | MEIER OBERTUFER |
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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