Patents by Inventor David W. Ohst

David W. Ohst 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).

  • Variable resistivity slip ring
    Patent number: H838
    Abstract: The series wound, air core (SWAC) homopolar generator includes a pair of ls connected in series with a rotor having a pair of slip rings joined by conductive bars. To reduce eddy currents induced in the slip rings, their radius and axial length are chosen such that the circumferential and axial resistances of the slip rings fall in a bounded region wherein the axial resistance is minimized and the circumferential resistance is maximized.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: November 6, 1990
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: David W. Ohst
  • Transposed air core homopolar generator conductors
    Patent number: H994
    Abstract: Current state of the art air core homopolar generators employ large time ying magnetic fields (4 Tesla Range). These high fields are required for proper voltage, but also induce significant eddy currents. Use of novel transposed rotor conductors and a novel transposed coil winding reduces these currents to acceptable levels. Furthermore use of a segmented stator current collection system further reduces the flow of eddy currents.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: November 5, 1991
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: David W. Ohst, Jack T. Gunn, Dennis Pavlik