The present invention is directed towards a multi-layered golf ball, at least the inner cover having multiple layers formed by a sandwich injection molding process, wherein each multi-layered cover comprises an inner layer and an outer layer of a first material and an intermediate layer therebetween...http://www.google.es/patents/US6676541?utm_source=gb-gplus-sharePatente US6676541 - Co-injection molded double covered golf ball
