Patent No. EP4331604 (titled "Anti-Pd-L1 Antibodies And Their Use To Enhance T-Cell Function") was filed by F Hoffmann LA Roche on Dec 8, 2009. The application was issued on Jul 23, 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.
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