Patents by Inventor Donald MacRae

Donald MacRae 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).

  • Process for the aluminothermic welding of rails with alloying of the weld metal in the rail head region
    Patent number: 6227282
    Abstract: The invention relates to a process for the aluminothermic welding of rails, the aluminothermically produced steel being poured into a refractory mold surrounding the rail ends which are to be joined, and alloying additives being contacted with that part of the steel which runs out of the reaction crucible and forms the weld in the rail head region, wherein the alloying with the alloying additives is carried out after the completion of the aluminothermic reaction and separation of the steel from the slag via the diverting plug in the mold, and the overflow in the is closed.
    Type: Grant
    Filed: September 12, 1997
    Date of Patent: May 8, 2001
    Assignee: Elektro-Thermit GmbH
    Inventors: Frank Kuster, Gerhardus Johannes Mulder, Donald MacRae, Michael Steinhorst