Patents by Inventor Hubert Wienands

Hubert Wienands 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).

  • Process and apparatus for the purification of waste water
    Patent number: 6080317
    Abstract: A process and apparatus for the purification of waste water includes a nano-filteration stage (19) which returns a stream of retained substance (20) in a cycle (15, 16, 17, 18) in order to effect a concentration of the content substances. Concentrate (29) is taken out of the cycle and is introduced into a physical and/or chemical treatment stage. At least a part of the treated concentrate (47) is returned into the cycle of the nano-filtration stage (19).
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: June 27, 2000
    Assignee: Wehrle-Werk AG
    Inventors: Friedrich Wagner, Hubert Wienands