Patents by Inventor Karl Pichl

Karl Pichl 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 recycling adhesive-coated plastic sheet material
    Patent number: 5290505
    Abstract: A method is indicated of recycling plastic sheet material coated with adhesive and available in chopped form. The method provides for separating the plastic from the adhesive. In a first method step the chopped sheet material (4) is introduced into a solvent bath (1) where the chopped sheet material (4) is moved for a predetermined dispersing time under mechanical action. The mechanical action preferably is exercized by rolling or kneading. In a second method step, the adhesive dispersed in the solvent is separated from the chopped sheet material (4) by mechanical action of forces--preferably by introducing squeezing forces in a conveyor screw.
    Type: Grant
    Filed: July 22, 1992
    Date of Patent: March 1, 1994
    Assignee: WNC-Nitrochemie GmbH
    Inventors: Gerhard Huber, Karl Pichl