Patents Assigned to University of Strathcylde
  • Optical fingerprinting of plastics compositions
    Patent number: 6091491
    Abstract: A plastics material which contains a pigment composition comprising a pigment having adsorbed on its surface, or as a physical mixture, up to 10% by weight, based on the total weight of pigment composition of a coding compound which is a compound containing azo, azomethine or polycyclic chromophore and which has an absorption spectrum and a Raman spectrum different from that of the pigment.
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: July 18, 2000
    Assignees: Ciba Specialty Chemicals Corporation, University of Strathcylde
    Inventors: Greig Chisholm, William Ewen Smith, Peter Cyril White