Patents by Inventor Robert W. English

Robert W. English 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).

  • Mixing and dispersing apparatus
    Patent number: 4981365
    Abstract: A mixing and dispersing apparatus is shown in FIG. 1 having a supply line 32 to deliver powder to the vessel and open it near the base of the vessel so as to be below the normal liquid level in the vessel. The top of the vessel is connected to a vacuum source and the valve is arranged to be open only when pressure in the vessel is below a predetermined minimum and to close automatically when the pressure rises above that minimum.
    Type: Grant
    Filed: July 14, 1989
    Date of Patent: January 1, 1991
    Assignee: Netzsch Mastermix Limited
    Inventors: Colin F. Bow, Robert W. English