Patent No. EP3186281 (titled "Combination Therapy With A Hyaluronan-Degrading Enzyme And An Immune Checkpoint Inhibitor") was filed by Halozyme on Aug 28, 2015. The application was issued on Apr 10, 2019.

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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