Patent No. EP3791896 (titled "Combination Therapy Involving Antibodies Against Claudin 18.2 For Treatment Of Cancer") was filed by Astellas Pharma on May 21, 2013. The application was issued on Jan 10, 2024.

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 |
|---|---|---|
| DR H ULRICH DORRIES | Oct 10, 2024 | DORRIES |
| DR H ULRICH DORRIES | Oct 10, 2024 | DORRIES, HANS ULRICH , DF-MP DORRIES FRANK-MOLNIA & POHLMAN |
| DR STRAUS | Oct 10, 2024 | STRAUS |
| MAIWALD | Oct 8, 2024 | 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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