McDermott Will & Emery filed a patent infringement lawsuit Tuesday in Delaware District Court against Pfizer and BioNTech. The complaint was brought on behalf of Alnylam Pharmaceuticals over its patented lipid nanoparticle (LNP) technology, used to deliver RNA-based vaccines. The complaint accuses the defendants of infringing the technology through their sale of a COVID-19 vaccine. Counsel have not yet appeared for the defendants. The case is 1:22-cv-00924, Alnylam Pharmaceuticals, Inc. v. Pfizer Inc. et al.