Patents by Inventor John A. Liszka

John A. Liszka 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).

  • Cleaning sprays for disc filters
    Patent number: 4975189
    Abstract: In rotating disc filters used for example in the pulp and paper industry, one or more spray elements are positioned between adjacent discs to rotate about an axis parallel to the disc axis. This arrangement achieves greater washing coverage of the discs than prior systems.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: December 4, 1990
    Inventor: John A. Liszka