Patents by Inventor Andrew John McLeod

Andrew John McLeod 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).

  • Separation process by fractional crystallization
    Patent number: 3959978
    Abstract: A crystallisable component, for example paraxylene, is separated from solution by chilling, separating crystals, washing them, chilling the mother liquor in the presence of wash liquid, separating further crystals and washing them. The invention enables concentrated solutions to be handled easily by keeping the proportions of crystals at each crystallisation stage low without requiring two separations of wash liquid from mother liquor.
    Type: Grant
    Filed: April 25, 1972
    Date of Patent: June 1, 1976
    Assignee: Imperial Chemical Industries Limited
    Inventors: John Lindley, Andrew John McLeod