Patents by Inventor Daniel G. Sander

Daniel G. Sander 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 foaming prior to injection molding
    Patent number: 5514310
    Abstract: An injection molding machine or extruder 10 for injecting a foamed thermoplastic material 82 into a mold 12 for forming a shaped article at a relatively low pressure. The injection molding machine comprises a barrel 20 housing a screw 22 disposed in a relatively loose clearance with respect to an inner surface 24 of the barrel. This loose clearance provides for churning a molten thermoplastic material into a foamed condition, which is then introduced into a mold. As the thermoplastic material cools, its foamed characteristic retards shrinkage of the thermoplastic material.
    Type: Grant
    Filed: March 25, 1994
    Date of Patent: May 7, 1996
    Inventor: Daniel G. Sander