Patents by Inventor Adrianus J. De Graaff

Adrianus J. De Graaff 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).

  • Wheel center
    Patent number: D256453
    Type: Grant
    Filed: November 21, 1977
    Date of Patent: August 19, 1980
    Inventor: Adrianus J. De Graaff