Patents by Inventor Wolfgang Wiesenhofer

Wolfgang Wiesenhofer 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 drying a slurry
    Patent number: 6006440
    Abstract: The invention is directed to a process and apparatus for drying a slurry, particularly a sludge, such as sewage sludge, in which a sludge mixture of recycled dried sludge and wet sludge is fed to a drier. The quantity of wet sludge or recycled dried sludge supplied to the drier is controlled based upon drier inlet temperature. In this way, the evaporation rate of the drier is kept substantially constant.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: December 28, 1999
    Assignee: Andritz-Payrntverwaltungs-gesellschaft M.B.H.
    Inventors: Wolfgang Wiesenhofer, Giselher Stummer