sippy cup

RC2 Sues Munchkin, Inc For "Sippy Cup" Patent Infringement

RC2 Sues Munchkin, Inc For "Sippy Cup" Patent Infringement

RC2, whom you probably know as the company that makes the lead-tainted Thomas & Friends toys, has filed a lawsuit against rival Munchkin, INC for allegedly infringing on a spill-proof sippy cup patent.