Molded product and method for providing a desired surface-hardness for its surface by means of a simple molding technique through several steps comprising the cutting of a thermoplastic film or sheet to the same form as the exterior form of the product, the placing of the cut piece on a mold-cavity surface,...http://www.google.com.au/patents/US4386042?utm_source=gb-gplus-sharePatent US4386042 - Molding of synthetic resin article having a hard coating
