Patents by Inventor Roy D. Johnson

Roy D. 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).

  • Home colonic board
    Patent number: D262656
    Type: Grant
    Filed: January 4, 1980
    Date of Patent: January 12, 1982
    Inventor: Roy D. Johnson
  • No lift rake
    Patent number: D391813
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: March 10, 1998
    Inventor: Roy D. Johnson