Patents by Inventor Maila P. Silvennoinen

Maila P. Silvennoinen 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).

  • Film viewer
    Patent number: D319454
    Type: Grant
    Filed: February 18, 1988
    Date of Patent: August 27, 1991
    Assignee: Kuva-Sampo Oy
    Inventor: Maila P. Silvennoinen
  • Combined film holder and viewer
    Patent number: D319649
    Type: Grant
    Filed: February 18, 1988
    Date of Patent: September 3, 1991
    Assignee: Kuva-Sampo Oy
    Inventor: Maila P. Silvennoinen