Patents by Inventor Oskar Hoglinger

Oskar Hoglinger 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).

  • Chlorine-free bleaching method for dissolving-grade pulps using an OP-Z-P sequence
    Patent number: 5145557
    Abstract: A three-stage bleaching process for dissolving grade pulp utilizes the sequence OP(alkaline)-Z-P and the off gas from the Z-stage is delivered to the alkaline (OP)-stage whose parameters are controlled to fully react all of the oxygen of the off gas. The filtrate or waste water from the Z-stage, at a pH below 3, serves to dilute the alkaline OP-stage pulp before Z-stage bleaching and/or for de-ashing of the P pulp following the P-stage.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: September 8, 1992
    Assignee: Lenzing Aktiengesellschaft
    Inventors: Walter Peter, Anton Hruschka, Oskar Hoglinger