Patents by Inventor Friedhelm Zorn

Friedhelm Zorn 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).

  • Biological method of treating sewage containing high concentrations of sludge
    Patent number: 6048460
    Abstract: The invention relates to a process for the biological treatment of waste water, in which a mixture of activated sludge and waste water is treated with gas in an activation stage and the activated sludge is separated off from the treated waste water by flotation, wherein the concentration of the activated sludge in the activation stage is .gtoreq.6 g/l and wherein the flotation is a pressure-relief flotation.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: April 11, 2000
    Assignee: Hoechst Research & Technology Deutschand GmbH & Co. KG
    Inventors: Wolfgang Horz, Friedhelm Zorn, Hans Lohe
  • Process and apparatus for separating off suspended matter from liquids
    Patent number: 5690834
    Abstract: In the process for separating off by flotation (pressure release) suspended matter from liquids which are present in a gas-introduction reactor, the suspension to be withdrawn for flotation is conducted at a flow velocity .ltoreq.0.3 m/s against the natural direction of bubble rise, gas being additionally introduced into the suspension. The gas-treated suspension is withdrawn at the bottom of the gas-introduction apparatus and it is fed to flotation.
    Type: Grant
    Filed: December 1, 1995
    Date of Patent: November 25, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Horst Bennoit, Gerhard Muller, Friedhelm Zorn