Patents by Inventor Lars O. Barkman

Lars O. Barkman 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 purifying waste water obtained by a papermaking process
    Patent number: 4127440
    Abstract: The waste water obtained from a papermaking process is purified to remove the last traces of fibers suspended in the water by mixing the waste water with those contaminating materials that are separated from the paper pulp suspension before it is fed to the papermaking machine. These contaminants act as a filter aid and make it possible to separate the fibers remaining in the water phase after the water from the papermaking machine has been subjected to a flocculating process, filtering and screening.
    Type: Grant
    Filed: July 10, 1975
    Date of Patent: November 28, 1978
    Assignee: Edet Aktiebolag
    Inventor: Lars O. Barkman