Patents by Inventor Per Stjerna

Per Stjerna 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).

  • Cooling device
    Patent number: 5684346
    Abstract: The invention concerns a cooling device for an electrically driven mixer operating in hot liquids.The motor (1) is surrounded by a cooling jacket (5) having inlet (8) and outlet (9) for cooling medium.The jacket (5) is provided with a concentric partition wall (6) which devide the room inside the jacket into two gaps (7) and (8) respectively of different widths.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: November 4, 1997
    Assignee: ITT Flygt AB
    Inventors: Jan Mickos, Roland Narholm, Per Stjerna, Peter Uvemo