A clear or translucent U-shaped insert has embedded within its cavity a light emitting module. The insert is preferably manufactured of polyvinyl chloride and conforms to the shape of the heel portion of footwear manufactured under the process of injection molding using polyvinyl chloride as the injected...http://www.google.es/patents/US5419061?utm_source=gb-gplus-sharePatente US5419061 - Lighted insert for footwear and method
