Patents by Inventor Doris J. Johnson

Doris J. Johnson 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).

  • Child toilet training center
    Patent number: D258679
    Type: Grant
    Filed: February 21, 1978
    Date of Patent: March 24, 1981
    Inventor: Doris J. Johnson