Patents by Inventor Martti I. Karkkainen

Martti I. Karkkainen 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).

  • Patent number: D277768
    Type: Grant
    Filed: May 18, 1982
    Date of Patent: February 26, 1985
    Assignee: Raha-Automaattiyhdistys
    Inventors: Martti I. Karkkainen, Lauri Martti