Patents by Inventor Heribert Dau

Heribert Dau 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).

  • Patent number: 4724080
    Abstract: A process for the crossflow-microfiltration of wine from a storage container through a membrane filter with membranes having a nominal pore diameter of 0.1-5 m, in which the mean velocity in the membrane filter is 0.5-6 m/second, wherein before entering the membrane filter the wine is warmed to a temperature which is above a temperature threshold that produces a definite increase in filter performance but at the most to 45.degree. C. Crossflow-microfiltration is carried out without addition of filtering aids and the filtrate obtained is cooled to storage temperature. An apparatus for carrying out the process comprises a storage container, a membrane filter with a nominal pore diameter of 0.1-5 m, a feed pump and piping, a heating device being attached upstream of the membrane filter and a cooling device and filtrate container being attached downstream therefrom.
    Type: Grant
    Filed: January 14, 1987
    Date of Patent: February 9, 1988
    Assignee: AKZO NV
    Inventors: Heribert Dau, Rolf Maurer, Franz-Josef Schmitz
  • Patent number: 4010303
    Abstract: A tufted nylon carpet having ribbon-shaped warp and filling yarns made from a mixture of 65 to 80 weight percent polyamide and 20 to 35 weight percent polyester. The yarns of the fiber exhibit a reduced tendency to split and the carpet has high dimensional stability and a very level appearance.
    Type: Grant
    Filed: April 14, 1976
    Date of Patent: March 1, 1977
    Assignee: Akzona Incorporated
    Inventors: Otto Ramsauer, Heribert Dau, Willi Gumbmann, Ulrich Schulze