Patents Examined by J. A. Orengo
  • Process for preparation of inorganic colorants from mixed rare earth compounds
    Patent number: 7279036
    Abstract: The present invention provides a novel process for preparation of inorganic colourants from mixed rare earth compounds, which are directly obtained from the ore industry, without undergoing any separation, thereby enabling a cost reduction to the extend of 10-100 times. Colors ranging from brown, blue and green can be obtained by suitable doping with other metal ions.
    Type: Grant
    Filed: December 23, 2004
    Date of Patent: October 9, 2007
    Assignee: Council of Scientific and Industrial Research
    Inventors: Janardhanan Sreeram Kalarical, Balachandran Unni Nair, Ramasami Thirumalachari