Patents by Inventor John M. Ratkovich

John M. Ratkovich 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).

  • Adjustable arm support
    Patent number: 4005840
    Abstract: An adjustable, compact and foldable rest for supporting both arms primarily upon a seated person's knees.
    Type: Grant
    Filed: February 17, 1976
    Date of Patent: February 1, 1977
    Inventor: John M. Ratkovich