Patents by Inventor Fredrick J. Armstrong

Fredrick J. Armstrong 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).

  • Patent number: 4150312
    Abstract: A disclosed process includes arranging field yoke segments, pole face segments, and one or more pieces of ceramic magnet material so that the yoke segments and pole face segments can be relied upon to establish low reluctance paths for magnetic flux associated with the ceramic magnet material. The process includes holding the ceramic magnet material sandwiched between the yoke pieces and pole pieces within a cavity of a casting fixture; admitting a molten metallic material to the cavity and adjacent to the yoke, pole, and ceramic material pieces; permitting the molten material to solidify; and thereafter removing the field assembly from the cavity with the ceramic pieces completely surrounded and encased by the pole pieces, yoke pieces, and solidified material. In a more preferred form, molten aluminum at a temperature of at least about 660.degree. C. is used as the molten metallic material even though the resulting thermal shock causes a fracturing or shattering of the ceramic material.
    Type: Grant
    Filed: February 24, 1978
    Date of Patent: April 17, 1979
    Assignee: General Electric Company
    Inventors: Fredrick J. Armstrong, Robert A. Susdorf