Patents by Inventor David A. Hauser

David A. Hauser 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).

  • Patent number: 4155972
    Abstract: An improved method for molding a unitary molded product comprised of three separate plastic materials includes the first step of molding the generally highest melting point, most abrasive, most viscous plastic material to mold a first form. Subsequently, the next generally lower melting point material is molded using the first form as a mold. Finally, the generally lowest melting point material is molded. By molding in a designated order, it is possible to mold a single product comprised of multiple plastic materials without having the materials bleed into one another. Additionally, a variety of materials having distinct melting points may be used to make a unitary molded product.
    Type: Grant
    Filed: September 6, 1977
    Date of Patent: May 22, 1979
    Assignee: Keystone Consolidated Industries, Inc.
    Inventors: David A. Hauser, Thomas J. Parrott