Patents by Inventor Hassan E. Shall

Hassan E. Shall 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 separating lignins and dissolved organic compounds from kraft spent liquor
    Patent number: 5635024
    Abstract: Digestion liquor is used in the paper pulping process to dissolve lignins and free the cellulose fiber from raw wood chips. After pulping, spent digestion liquor is laden with lignins. Heretofore, it was known that lignins could be coagulated by acidification of the digestion liquor, but such method coagulated the lignins in a slimy gelatinous mass that was difficult to separate from the liquor. It has been discovered that the addition of water soluble, surface active, polymeric agents to the digestion liquor prior to acidification, results in an easily separable lignin coagulant after acidification.
    Type: Grant
    Filed: August 20, 1993
    Date of Patent: June 3, 1997
    Assignee: Bountiful Applied Research Corporation
    Inventor: Hassan E. Shall