Patents by Inventor Wilfried Sturm

Wilfried Sturm 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 for the production of foamed polystyrene films
    Patent number: 5342560
    Abstract: The invention relates to a method of producing a multi-layer, preferably two-layer, sandwich of a foamed polystyrene film with a co-extruded unfoamed film, in particular for further working into labels or shaped bodies utilizing the shrinkability of the films, in which a polystyrene resin composition, together with nitrogen as expansion agent and a pore-former, is extruded out of the nozzle of an extruder and the extruded composition is expanded prior to cooling to below the softening point.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: August 30, 1994
    Assignee: Gerro Plast GmbH
    Inventors: Wilfried Sturm, John Fumei