Patents by Inventor Frank F. Bull

Frank F. Bull 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).

  • Self-cleaning shower nozzle system
    Patent number: 5351886
    Abstract: A two piece non-moving nozzle assembly of which one piece includes an orifice with an internal extension acting as a solids barrier and the second piece providing channels for liquid and air passage. At a predetermined interval, air is automatically forced through the orifice in the opposite direction to liquid flow. When air is forced through the orifice, solids are removed.
    Type: Grant
    Filed: February 11, 1993
    Date of Patent: October 4, 1994
    Inventors: Dan F. Bull, Frank F. Bull