Patents by Inventor John D. MacArthur

John D. MacArthur 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).

  • Patent number: 4317521
    Abstract: Apparatus and method for sorting scrap metal pieces dependent on the type of metal therein. The apparatus includes a conveyor and a feeding arrangement to feed the scrap metal pieces on to the conveyor, together with an X-ray fluorescence detector to examine each metal piece and determine the type of metal as a result of the characteristic X-rays emitted. A respective control signal is utilized to move pegs on the conveyor so as to permit the respective metal piece to exit from the conveyor along a respective path and to enter a bin for that particular type of metal. In this way scrap metal pieces of different metal are collected in different bins for subsequent processing.
    Type: Grant
    Filed: August 14, 1980
    Date of Patent: March 2, 1982
    Assignee: Resource Recovery Limited
    Inventors: Reginald H. Clark, John D. MacArthur, Michael Sayer, William D. Wilder