Patent No. EP3085780 (titled "Producing Hybrid Antibodies Containing Human Variable Regions And Rodent Constant Regions") was filed by Regeneron Pharmaceuticals on Feb 15, 2002. The application was issued on Jun 28, 2023.

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 |
|---|---|---|
| KYMAB | Jun 28, 2019 | CMS CAMERON MCKENNA NABARRO OLSWANG |
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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