Patents by Inventor Matti K. Ruotsalainen

Matti K. Ruotsalainen 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).

  • Diapositive trimmer
    Patent number: 4224853
    Abstract: A device for trimming a diapositive with trimming angles and punching pins so the diapositive can be exactly positioned within a frame.
    Type: Grant
    Filed: March 29, 1978
    Date of Patent: September 30, 1980
    Inventor: Matti K. Ruotsalainen