Patents by Inventor Geoffrey Sigworth

Geoffrey Sigworth 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 optimization of the grain refinement of aluminum alloys
    Patent number: 6073677
    Abstract: The invention is a method of controlling the grain refinement of certain aluminium alloys. The grain sizes for different values of the grain growth index, GGI, are determined for the used casting method. The GGI is represented by the sum of m(k-1) value multiplied with the concentration for every element in the aluminium alloy. If the value for a certain alloy is compared with known relations between the m(k-1) value and the grain size the composition of the alloy melt is amended to an optimum grain size by adding a grain size affecting agent. The method can be further improved by optimising the amount of nucleating agent.
    Type: Grant
    Filed: August 4, 1998
    Date of Patent: June 13, 2000
    Assignee: Opticast AB
    Inventors: Lennart Backerud, Mats Johnsson, Geoffrey Sigworth
  • Grain refiner for aluminum containing silicon
    Patent number: 5055256
    Abstract: Disclosed is an Al-Ti-B master alloy especially designed to grain refine cast aluminum alloys containing silicon. The alloy composition goes contrary to present known art. Present commercial master alloys contain a ratio of Ti to B exceeding 2.2 to promote a mixture of TiB.sub.2 and TiAl.sub.3 crystals. This invention provides an Al-Ti-B alloy wherein the Ti to B ratio is 1. It contains a preponderance of mixed boride crystals. The optimum composition of the alloy of this invention is Al-3Ti-3B.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: October 8, 1991
    Assignee: KB Alloys, Inc.
    Inventors: Geoffrey Sigworth, Matthew Guzowski