Patents by Inventor Donald James Butterworth

Donald James Butterworth 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).

  • Liquid treatment apparatus
    Patent number: 4116840
    Abstract: A liquid distribution pipe in liquid treatment apparatus is divided into two separate liquid distribution sections. Each pipe section fits into a separate nozzle on the surface of the apparatus and is independent of the other pipe section. Each section of liquid distribution pipe can be isolated from all other sections, and can supply or withdraw liquid from the apparatus independent of the other sections.
    Type: Grant
    Filed: August 12, 1977
    Date of Patent: September 26, 1978
    Assignee: Ecodyne Corporation
    Inventor: Donald James Butterworth