A tamper proof identification card. The disclosed card is made from a core of safety paper sandwiched between two top and bottom layers of polyester coated with polyethylene. The safety paper is bounded at its periphery by a polyester border similar to the top and bottom layers. The layered card is heat...http://www.google.com.au/patents/US4589687?utm_source=gb-gplus-sharePatent US4589687 - Identification card method and apparatus
