An electric device, such as an electronic book, retrieves information from a memory and displays the information. A matrix array of sensors associated with the display can be actuated by a user to designate particular portions of a displayed page. In response to the designations, flags are stored identifying...http://www.google.de/patents/US5475398?utm_source=gb-gplus-sharePatent US5475398 - Electric display device providing emphasis and retrieval of designated information
