Patents by Inventor Robert A. Fjeld

Robert A. Fjeld 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).

  • Method and apparatus for separating impurities from low conductivity liquids
    Patent number: 4579637
    Abstract: A method and apparatus for removing particulate matter suspended in low conductivity liquids employs extrinsic ions to electrically charge suspended particles. A unipolar current of the extrinsic ions is passed through the flowing liquid to efficiently charge the particles. The charged particles may then be removed by agglomeration and sedimentation techniques, or by other means. A stripping section is disposed upstream of the region in which the particles are charged, in order to strip the double layer of counter ions from the particles before the particles are charged.
    Type: Grant
    Filed: January 10, 1984
    Date of Patent: April 1, 1986
    Assignee: American Filtrona Corporation
    Inventors: Rajan A. Jaisinghani, Robert A. Fjeld