Patents by Inventor Axel Hollstein

Axel Hollstein 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).

  • Method of separating polyethylene (PE) and polypropylene (PP)
    Patent number: 5370235
    Abstract: Plastic mixtures, in particular those of a similar density such as polyethylene and polypropylene, are separated electrostatically, whereby prior to charging, the mixture is subjected to a surface treatment.
    Type: Grant
    Filed: April 9, 1993
    Date of Patent: December 6, 1994
    Assignee: Kali und Salz Aktiengesellschaft
    Inventors: Ingo Stahl, Axel Hollstein, Ulrich Kleine-Kleffmann, Iring Geisler, Ulrich Neitzel
  • Method of separating poly(ethylene terephthalate) (PET) and poly(vinyl chloride) (PVC)
    Patent number: 5366091
    Abstract: Plastic mixtures, in particular those of a smilar density such as polyethylene terephthalate and polyvinyl chloride, are separated electrostatically, whereby the mixture, for triboelectric charging, is subjected to a thermal treatment.
    Type: Grant
    Filed: April 9, 1993
    Date of Patent: November 22, 1994
    Assignee: Kali und Salz Aktiengesellschaft
    Inventors: Ingo Stahl, Axel Hollstein, Ulrich Kleine-Kleffmann, Iring Geisler, Ulrich Neitzel
  • Method of separating a mixture of plastics comprising at least three components using electrostatic techniques
    Patent number: 5358119
    Abstract: Plastic mixtures are split up into the individual components by a process combining density separation with electrostatic separation, and includes a special surface treatment which takes place prior to the electrostatic separation.
    Type: Grant
    Filed: April 9, 1993
    Date of Patent: October 25, 1994
    Assignee: Kali und Salz Aktiengesellschaft
    Inventors: Ingo Stahl, Axel Hollstein, Ulrich Kleine-Kleffmann, Iring Geisler, Ulrich Neitzel