Patents by Inventor Arthur N. Hillebrand

Arthur N. Hillebrand 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 for manufacturing composite powder metal parts
    Patent number: 4353155
    Abstract: Composite powder metal parts made of separate and distinct powders are produced by forming a low density preform of a first powder and then using the preform to define a part of the cavity employed to accommodate the second powder prior to final compaction. The cavity employed in forming the preform is defined by a die wall and a major diameter of a trailing section of a concentrically disposed core pin. A second cavity for the second powder is formed between the preform and the minor diameter of the distal section of the core pin.
    Type: Grant
    Filed: June 25, 1980
    Date of Patent: October 12, 1982
    Inventors: Arthur N. Hillebrand, John D. Sterbank