Patents by Inventor Alf-Eric Wischnat

Alf-Eric Wischnat 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).

  • Adsorbents composed of inorganic oxides modified with organic dyes
    Patent number: 5766312
    Abstract: Particulate adsorbents composed of inorganic oxides impregnated with an indicator dye selected from the group consisting of phenolphthalein, cresol red and thymol blue; a method for the production thereof, and a method for adsorptive drying of neutral gases using the aforementioned particulate adsorbents, whereby the degree of water absorption by the adsorbent particles is indicated by a reversible color change.
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: June 16, 1998
    Assignee: Engelhard Process Chemicals GmbH
    Inventors: Kirsten Furhmann, Alf-Eric Wischnat, Thomas Schulz, Michael Hoffmeister
  • Adsorbents composed of inorganic oxides modified with organic dyes
    Patent number: 5484454
    Abstract: Particulate adsorbents composed of inorganic oxides impregnated with an indicator dye selected from the group consisting of phenolphthalein, cresol red and thymol blue; a method for the production thereof, and a method for adsorptive drying of neutral gases using the aforementioned particulate adsorbents, whereby the degree of water absorption by the adsorbent particles is indicated by a reversible color change.
    Type: Grant
    Filed: October 5, 1994
    Date of Patent: January 16, 1996
    Assignee: Engelhard Process Chemicals GmbH
    Inventors: Kirsten Furhmann, Alf-Eric Wischnat, Thomas Schulz, Michael Hoffmeister
  • Sorption of organic compounds from fluids
    Patent number: 5421860
    Abstract: A method for the sorption of organic compounds using a sorbent, comprising activated carbon in a preferably amorphous oxidic support is described. Novel sorbents are also described.
    Type: Grant
    Filed: May 18, 1993
    Date of Patent: June 6, 1995
    Assignee: Engelhard Process Chemicals GmbH
    Inventors: Karl-Heinz Bretz, Kristen Fuhrmann, Michael Hoffmeister, Peter Engelmann, Andreas Meyer-Anderson, Egon Schultz, Alf-Eric Wischnat, Helmut Derleth, Norbert Schwetje