Patents by Inventor James J. Dowd

James J. Dowd 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).

  • Cathode cup improvement
    Patent number: 4894853
    Abstract: A cathode electrode improvement is disclosed which utilizes a front focus slot having a diverging cross-sectional area to focus an electron beam within an x-ray tube to provide a high emission, small area focal spot.
    Type: Grant
    Filed: June 21, 1989
    Date of Patent: January 16, 1990
    Assignee: Siemens Medical Systems, Inc.
    Inventor: James J. Dowd
  • Cathode cup improvement
    Patent number: 4868842
    Abstract: A cathode electrode improvement is disclosed which utilizes a front focus slot having a diverging cross-sectional area to focus an electron beam within an x-ray tube to provide a high emission, small area focal spot.
    Type: Grant
    Filed: March 19, 1987
    Date of Patent: September 19, 1989
    Assignee: Siemens Medical Systems, Inc.
    Inventor: James J. Dowd