Patents by Inventor Lothar Koppetsch

Lothar Koppetsch 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).

  • Gas-cooled electrical machine
    Patent number: 5602435
    Abstract: In the case of a gas-cooled electrical machine, the effective flow cross-section of the connection from the outer hot-gas chambers to the cooler is provided with an adjustable restrictor device (29, 31; 32, 33). In this way, the splitting of the various cooling-air flows within the machine can be influenced, without intervention in the actual machine, such that equalization of the temperature level in the machine longitudinal direction is achieved.
    Type: Grant
    Filed: August 17, 1994
    Date of Patent: February 11, 1997
    Assignee: ABB Management AG
    Inventors: Markus Iseli, Lothar Koppetsch, Hans Zimmermann