Patents Assigned to Wolfgang Hoelderich
  • Molecular sieves containing azo dyes
    Patent number: 5573585
    Abstract: Crystalline molecular sieves useful as colorants contain one or more chromophores of the class of the mono- or polyazo dyes that are devoid of acidic groups.
    Type: Grant
    Filed: September 12, 1994
    Date of Patent: November 12, 1996
    Assignee: Wolfgang Hoelderich
    Inventors: Guenter Lauth, Wolfgang Hoelderich, Gerhard Wagenblast, Bernhard Albert, Gunther Lamm, Helmut Reichelt, Clemens Grund, Sabine Gruettner-Merten