Patents by Inventor John F. Tobin

John F. Tobin 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).

  • Mixer with movable wiper
    Patent number: 5197803
    Abstract: A mixer is mechanically self cleaned without using solvents. A housing defines a mixing chamber with a fluid pressurized mixer head rotatably supported within the housing. The mixer head has retractable mixing paddles. A wiper scrubs material from the mixing head and chamber walls as it is advanced through the mixing chamber during cleaning. A nozzle plunger drives material from a mixing chamber nozzle.
    Type: Grant
    Filed: December 5, 1991
    Date of Patent: March 30, 1993
    Inventors: Joseph E. Wall, John F. Tobin