Patents Examined by Bijan Ahvaz
  • Reversible thermochromic compositions
    Patent number: 8273822
    Abstract: The present invention pertains to a reversible thermochromic system comprising a ?-phenylvinylketone or a ?-phenyl polyacetylenyl ketone with at least one acidic hydrogen and a base and to a reversible thermochromic composition comprising the reversible thermochromic system and a carrier material and to novel substituted ?-phenylvinylketones or ?-phenyl polyacetylenyl ketones with at least one acidic hydrogen.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: September 25, 2012
    Assignee: BASF SE
    Inventors: Mirko Rossi, Graziano Zagnoni, Manuele Vitali, Dario Lazzari, Walter Fischer