Patents Represented by Attorney Hamilton, Brook, Smith & Brooks, P.C.

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  • 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