Patents by Inventor Albert Drenth

Albert Drenth 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 of making a hollow core structural member
    Patent number: 5348798
    Abstract: An improved method for forming a hollow core structural member, such as an automotive bumper beam, from moldable plastic sheets, such as fiberglass reinforced plastic sheets, by providing a press having a desired shape on the opposing members of the press, placing opposed sheets in the press with a layer of frozen, meltable material, such as ice, in place between them, forming the sheets into the desired article configuration in the press, removing the formed member from the press, then melting and removing the meltable material from the interior of the formed member.
    Type: Grant
    Filed: October 30, 1992
    Date of Patent: September 20, 1994
    Assignee: Azdel, Inc.
    Inventors: Albert H. Berghuis, Richard C. McKechnie, Albert Drenth