Patents by Inventor Walther Bartel

Walther Bartel 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).

  • Process for manufacturing hollow plastic objects
    Patent number: 6270710
    Abstract: A process for manufacturing hollow synthetic resin bodies or objects in which cores are produced in casting molds, then placed into molds of injection molding machines, and subsequently enveloped with injected synthetic resin material (35) which then solidifies. The molds are then heated up to a temperature at which the cores melt and at which the molten cores can be removed from the molds. The cores are made of shell halves (32, 33) which are assembled before the synthetic resin material (35) is injection molded around them.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: August 7, 2001
    Assignee: Filterwerk Mann & Hummel GmbH
    Inventors: Walther Bartel, Wolfgang Cedzich, Robert Vaculik, Richard Veigel