Patents by Inventor Johan Källgren

Johan Källgren 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).

  • Circular film heater
    Patent number: 6225608
    Abstract: A range cook top is provided with circular heating zones having a layer of resistive thin film thereon. Slots in the cook top separate the heating zones from the surrounding areas of the cook top. The heating zone includes a resistive layer elements formed by a rectangular layer surrounded by annular arcuate segments. Power supply bus bars are disposed around edges of the resistive layer elements. A dual heater has separately controlled rectangular and annular resistive elements. Temperature sensors are also provided.
    Type: Grant
    Filed: November 30, 1999
    Date of Patent: May 1, 2001
    Assignee: White Consolidated Industries, Inc.
    Inventor: Johan Källgren