Executive Summary
Merck has filed a post‑grant review petition challenging Halozyme’s U.S. Patent 12,077,791 covering modified PH20 hyaluronidase proteins. The petition asserts that the claims are overly broad and lack both written description and enablement under 35 U.S.C. §112(a). Merck seeks institution of the proceeding and cancellation of all claims.
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