Patents by Inventor Richard F. Denmon

Richard F. Denmon 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).

  • Manhole guard
    Patent number: D539918
    Type: Grant
    Filed: July 19, 2005
    Date of Patent: April 3, 2007
    Inventor: Richard F. Denmon
  • Manhole guard
    Patent number: D570492
    Type: Grant
    Filed: March 6, 2006
    Date of Patent: June 3, 2008
    Inventor: Richard F. Denmon