Patents by Inventor Stefan Wickenkamp

Stefan Wickenkamp 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).

  • Double-webbed mandrel
    Patent number: 7329116
    Abstract: An mandrel for extrusion of hollow bodies, such as, polyvinyl chloride (PVC) hard, compact, and foamed pipes, includes an inner collar, an outer collar, and a middle collar, each of the collars being radially joined by webs to the particular adjoining collar. Each interior web and exterior web, relative to the middle collar, can form a web pair, the webs of the web pair being arranged to overlap at least partially in the radial direction in a particular embodiment.
    Type: Grant
    Filed: October 3, 2003
    Date of Patent: February 12, 2008
    Assignee: American Maplan Corporation
    Inventors: Heinrich Dohman, Stefan Wickenkamp
  • Double-webbed mandrel
    Publication number: 20040119195
    Abstract: An mandrel for extrusion of hollow bodies, such as, polyvinyl chloride (PVC) hard, compact, and foamed pipes, includes an inner collar, an outer collar, and a middle collar, each of the collars being radially joined by webs to the particular adjoining collar. Each interior web and exterior web, relative to the middle collar, can form a web pair, the webs of the web pair being arranged to overlap at least partially in the radial direction in a particular embodiment.
    Type: Application
    Filed: October 3, 2003
    Publication date: June 24, 2004
    Applicant: American Maplan Corporation
    Inventors: Heinrich Dohmann, Stefan Wickenkamp