Patents by Inventor Walter B. Bartkowski

Walter B. Bartkowski 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).

  • Ring
    Patent number: D258642
    Type: Grant
    Filed: February 17, 1978
    Date of Patent: March 24, 1981
    Inventor: Walter B. Bartkowski