Patents by Inventor Marius Leimer

Marius Leimer 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).

  • Process for enhancing the filterability of organic pigments
    Patent number: 5013455
    Abstract: A process for enhancing the filterability of organic pigments, which comprises adding to an aqueous pigment suspension 0.5 to 15% by weight, based on the pigment, of an unbranched aliphatic 1,2-dihydroxy compound containing 8 to 22 carbon atoms, and stirring the mixture for at least 15 minutes in the temperature range from 20.degree. to 100.degree. C.Pigments treated by the process of this invention have substantially enhanced filterability as compared with identical pigments which have not been treated with the 1,2-dihydroxy compound.
    Type: Grant
    Filed: September 26, 1990
    Date of Patent: May 7, 1991
    Assignee: Ciba-Geigy Corporation
    Inventors: Marius Leimer, Jost von der Crone, Fridolin Babler, Heinz Neuschutz