Patents by Inventor Thomas Joachimides

Thomas Joachimides 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 bleaching mechanical wood pulp with sodium hydrosulfite and sodium hydroxide in a refiner
    Patent number: 5129987
    Abstract: A paper pulp refining and bleaching process wherein the pulp is treated in one or more refiners with a sodium hydrosulfite bleach liquor in the presence of a strong alkali such as NaOH, whereby the bleaching solution has an alkaline pH, preferably 10 to 12, and the pulp is discharged from the refiner at a pH of from about 5 to 6. The bleaching produces a brightness gain of at least 8 to 13 ISO points in the refiners. The process is preferably carried out by passing the pulp successively through a primary refiner at elevated pressure, a secondary refiner at atmospheric pressure and a bleaching tower, an alkaline hydrosulfite solution being fed to each.
    Type: Grant
    Filed: April 9, 1990
    Date of Patent: July 14, 1992
    Assignee: Morton Thiokol, Inc.
    Inventors: Thomas Joachimides, Stephen H. Levis, Bert A. Edstrom, Hans B. S. Moldenius