Patents by Inventor Knut Tronstad

Knut Tronstad 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).

  • Fireplace
    Patent number: 4030475
    Abstract: A fireplace or fireplace insert is provided with semicircular rooms or channels for storage of a guided door and/or fire-screen which are/is movable from a position in front of the fireplace to a storage position in said rooms or channels.
    Type: Grant
    Filed: October 8, 1975
    Date of Patent: June 21, 1977
    Assignee: Aksjeselskapet Jotul
    Inventor: Knut Tronstad