Patents Assigned to Prototypon Establishment
  • Book, more particularly pocket dictionary
    Patent number: 4244603
    Abstract: Book comprising uncreasable and water-proof cards (6) of a thickness remaining constant in time, these cards being produced from plastics, the text thereon being printed by typographic or offset or other process in a manner known per se. The thickness of the cards is comprised between 0.20 and 0.26 mm and polyvinyl chlorides or polystyrene can be used as plastics. Each card has a configuration comprising converging edges (9, 10) at one end provided with a circular cut-out (7) for a prin connecting all the cards (6).
    Type: Grant
    Filed: May 9, 1979
    Date of Patent: January 13, 1981
    Assignee: Prototypon Establishment
    Inventor: Laura De Monti