Patents by Inventor Walter O. Freitag

Walter O. Freitag 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).

  • Making magnetic powders
    Patent number: 4394160
    Abstract: Magnetic powders for use in the manufacture of magnetic recording media are produced by a borohydride process in which aqueous solutions of ferrous sulfate and sodium borohydride are mixed in a magnetic field. The coercive force of the magnetic powder produced as a result of this method is controlled by controlling the temperature of the reactant solutions prior to mixing thereof.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: July 19, 1983
    Assignee: Sperry Corporation
    Inventors: Walter O. Freitag, Victor V. Suchodolski
  • Connector device
    Patent number: 4018495
    Abstract: The invention discloses a connector having a contact means which does not gouge the metallization of a printed circuit card when an ohmic connection is made. The connection is obtained by guiding the contact over the metallization until it is properly located after which it is snapped into position. An ohmic connection is thereby made between the printed circuit card and the connector.
    Type: Grant
    Filed: October 2, 1975
    Date of Patent: April 19, 1977
    Assignee: Sperry Rand Corporation
    Inventor: Walter O. Freitag