Patents by Inventor Charles H. Helein

Charles H. Helein 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).

  • Doll
    Patent number: D271405
    Type: Grant
    Filed: January 27, 1982
    Date of Patent: November 15, 1983
    Inventor: Charles H. Helein
  • Doll
    Patent number: D271598
    Type: Grant
    Filed: January 27, 1982
    Date of Patent: November 29, 1983
    Inventor: Charles H. Helein