This invention includes a card assembly incorporating an electrostatically charged polyolefin film, or electret, removably adhered to a paper stock or card substrate. The electret and card assembly is printable on up to four planar surfaces, with both the electret film and paper stock or card having...http://www.google.com.au/patents/US20070044356?utm_source=gb-gplus-sharePatent US20070044356 - Electret and card assembly and method of manufacture
