Patents by Inventor Werner Wehrli

Werner Wehrli 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).

  • Procedure for the continuous production of free flowing and homogenous mixtures of plastic materials with admixtures
    Patent number: 4698378
    Abstract: Processes for continuous conversion of granulated PVC material and additive substances to free-flowing pre-blends mechanically intermix at room temperature granulated PVC material and additive substances in a first zone continuously transversed thereby to provide a macroscopically homogeneous admixture thereof. The additive substances are melted in a subsequent second zone and the molten additive substances are absorbed with the granulated PVC material in a subsequent third zone to provide the free-flowing pre-blend. This pre-blend advantageously may be passed through a second set of three zones corresponding to the mentioned first, second and third zones.
    Type: Grant
    Filed: October 3, 1985
    Date of Patent: October 6, 1987
    Assignee: Buss AG
    Inventors: Werner Wehrli, Peter Franz