Patents by Inventor Heidrun Mehler

Heidrun Mehler has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7459016
    Abstract: A method for the production of a phthalocyanine pigment preparation includes finely distributing a crude phthalocyanine pigment by dry milling, wet milling, salt kneading, acid pasting or acid swelling to give a pre-pigment, the pre-pigment is subjected to a finishing treatment in a mixture of water and an organic solvent at alkaline pH, increased temperature and in the presence of at least one pigment dispersant from the group of phthalocyanine sulphonic acids, phthalocyanine carboxylic acids, phthalocyanine sulphonate salts, phthalocyanine carboxylate salts and phthalocyanine suiphonamides.
    Type: Grant
    Filed: November 27, 2003
    Date of Patent: December 2, 2008
    Assignee: Clariant Produkte (Deutschland) GmbH
    Inventors: Klaus Brychcy, Joachim Weber, Heidrun Mehler