Patents by Inventor Friederun Kohnen

Friederun Kohnen 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).

  • Cover for an open container, whose content is to be heated in a microwave oven
    Patent number: 4797523
    Abstract: A cellulose hydrate film, having ventilation holes, for use in covering otherwise open topped containers of various sizes and shapes, in which the contents are to be heated in a microwave oven.
    Type: Grant
    Filed: August 19, 1986
    Date of Patent: January 10, 1989
    Inventor: Friederun Kohnen