Patents by Inventor Nelson R. Gratzer

Nelson R. Gratzer 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 for expanding tubular blanks
    Patent number: 4414834
    Abstract: A method and apparatus for expanding a tubular workpiece which includes mounting the workpiece in a lower die, filling the workpiece with fluid and engaging the upper portion of the workpiece with an upper die. The upper die is moved downwardly acting to physically compress the workpiece. The dies are additionally configured to form an internal pressure cavity such that further downward displacement of the upper die creates an internal pressure forcing the workpiece outwardly into the desired end configuration.
    Type: Grant
    Filed: January 26, 1983
    Date of Patent: November 15, 1983
    Assignee: Carrier Corporation
    Inventors: Nelson R. Gratzer, William E. Wright
  • Refrigerant accumulator and method of manufacture thereof
    Patent number: 4231230
    Abstract: An accumulator for use in a refrigerant circuit having a tube in which are formed inlet and discharge openings and a cylindrical shell which is deformed by metal spinning against the exterior surface of the tube to form a container which serves as the accumulator. A diverter is provided between the discharge opening and the inlet opening to prevent direct flow through the tube bypassing the container. A method of manufacture of the accumulator by metal spinning is also disclosed.
    Type: Grant
    Filed: April 11, 1979
    Date of Patent: November 4, 1980
    Assignee: Carrier Corporation
    Inventors: Nelson R. Gratzer, William E. Wright