Patents by Inventor Mary E. Heinlein

Mary E. Heinlein 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).

  • Portable stage structure and kit
    Patent number: 4764142
    Abstract: A children's portable stage structure embodying a changeable pictorial scene setting outer curtain, an inner closure curtain, and a canopy removably extending the stage structure outwardly of a supporting wall surface.
    Type: Grant
    Filed: June 8, 1987
    Date of Patent: August 16, 1988
    Inventors: Marlene J. Griffith, Mary E. Heinlein