Patents by Inventor Nagy H. El-Kaddah

Nagy H. El-Kaddah 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).

  • Induction melting of metals without a crucible
    Patent number: 5033948
    Abstract: The solid metal to be melted is placed on a support, within an induction coil which is adapted to provide a greater electromagnetic force towards the lower portion of the quantity of metal. When energy is provided to the coil, the metal melts from the top downward, but the concentration of electromagnetic force towards the bottom of the metal causes the liquid metal to retain a cylindrical shape. When most of the metal is melted, the liquid metal passes through an opening in the support. In a preferred embodiment, the coil is movable relative to the quantity of metal, and at the beginning of the melting process only the top portion of the quantity of metal is disposed within the coil. As the quantity of metal melts, the coil is moved downward. The method may also be used for removing impurities from the quantity of metal.
    Type: Grant
    Filed: April 6, 1990
    Date of Patent: July 23, 1991
    Assignee: Sandvik Limited
    Inventors: Nagy H. El-Kaddah, Thomas S. Piwonka, John T. Berry
  • Induction melting of metals without a crucible
    Patent number: 5014769
    Abstract: The solid metal to be melted is placed within an induction coil which is adapted to provide a greater electomagnetic force towards the lower portion of the quantity of metal. The solid metal rests on a support, having an opening therethrough, which is kept at a low temperature relative to the metal as it melts. When energy is provided to the coil, the metal melts from the top downward, but the concentration of electromagnetic force towards the bottom of the metal causes the liquid metal to retain a cylindrical shape. When most of the metal is melted, the liquid metal passes through the opening in the support into a casting mold.
    Type: Grant
    Filed: April 17, 1989
    Date of Patent: May 14, 1991
    Assignee: Inductotherm Corp.
    Inventors: Nagy H. El-Kaddah, Thomas S. Piwonka, John T. Berry
  • Apparatus and a method for improved filtration of inclusions from molten metal
    Patent number: 4909836
    Abstract: A system which provides an improved design capable of removing liquid phase inclusions by combining a filter and an electromagnetic separation device through the addition of baffles to a chamber where molten metal is flowing under the influence of an applied electromagnetic field. The placement and the shape of the baffles reduces vorticity effects of the magnetic field in each of the baffled compartments and eliminates the convective flow resulting from the electromagnetic force in order to trap inclusions against the walls of the baffles.
    Type: Grant
    Filed: October 18, 1988
    Date of Patent: March 20, 1990
    Assignee: The University of Alabama
    Inventor: Nagy H. El-Kaddah