Patents by Inventor Ellen Wanzura

Ellen Wanzura 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 produced gypsum
    Patent number: 5169617
    Abstract: A method for treating produced gypsum and, in particular, a method for treating flue-gas desulfurization gypsum forms highly active, modifiable gypsum binders of high strength with simultaneously drying, deagglomerating and dehydrating. Pursuant to the invention, produced gypsum (flue-gas desulfurization gypsum), with a particle size ranging up to 200 .mu.m, to which 10% by weight of milled natural gypsum is optionally added, is dehydrated at a material temperature of 335.degree. to 363.degree. K. and at a pressure ranging from 2.5 to 8 kpa, the dehydration being concluded when anhydrite III constitutes 50% to 100% by weight.
    Type: Grant
    Filed: February 12, 1991
    Date of Patent: December 8, 1992
    Assignee: Ruedersdorfer Zement GmbH
    Inventors: Paul Clemens, Ellen Wanzura, Guenter Fietsch, Helmut Meyer, Detlef Kunze, Hans-Juergen Hartmann, Wolfgang Schnelle