Patents by Inventor Catherine M. Dentan

Catherine M. Dentan 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).

  • Method of treating zeolite ores to remove discoloring impurities and improve its brightness and resulting finely ground zeolite
    Patent number: 4510254
    Abstract: A method of treating zeolites to remove therefrom discoloring impurities and improve the brightness thereof, comprising the steps of mixing a pulverized sedimentary zeolite ore with a dispersant and water to form a dispersed aqueous zeolite slurry, degritting the resulting slurry, removing fines containing discoloring impurities from the degritted slurry, thereafter subjecting the zeolite slurry to a fine media milling, removing fines containing discoloring impurities from the resulting fine milled slurry, subjecting the fine milled slurry to magnetic separation to remove magnetic discoloring impurities, bleaching the resulting zeolite slurry and then recovering the zeolite in dry form from the resulting slurry. The dry finely ground zeolite made by this method has a particle size of at least 85% below 2 .mu.m and a Tappi brightness of at least 90.
    Type: Grant
    Filed: January 23, 1984
    Date of Patent: April 9, 1985
    Inventors: Horton H. Morris, John R. Whyte, Jr., Ellen Forbus, Catherine M. Dentan, David R. Collins