Patents by Inventor Peter H. Huisman

Peter H. Huisman 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).

  • Method and apparatus for treating sewage
    Patent number: 3939067
    Abstract: A method and means for treating sewage using the activated sludge process. Sewage in a circular aeration chamber is given a spiral motion about the chamber centre and this motion is used to cause liquid-borne sludge to flow from the chamber along a canal around the chamber. Part of the sludge is returned from the canal to the chamber under the influence of gravity for recirculation.
    Type: Grant
    Filed: October 30, 1973
    Date of Patent: February 17, 1976
    Assignee: Gypsum Industries Limited
    Inventor: Peter H. Huisman