Patents by Inventor Robert Clifford Blackstone

Robert Clifford Blackstone 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).

  • Nitrile process
    Patent number: 6355828
    Abstract: A process for purifying a nitrile such as acrylonitrile is disclosed. The process comprises (1) contacting a product mixture, which comprises acrylonitrile and hydrogen cyanide, with an acid or a precursor of the acid to produce an acid-treated product; and (2) recovering the nitrile from the acid-treated product. The product mixture can be produced by contacting ammonia with a hydrocarbon such as an olefin under a condition effective to produce a nitrile and hydrogen cyanide.
    Type: Grant
    Filed: November 10, 2000
    Date of Patent: March 12, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Janet Marie Rogers, Robert Clifford Blackstone, Jeffrey Jon Horsager
  • Nitrile process
    Patent number: 6084121
    Abstract: A process for purifying a nitrile such as acrylonitrile is disclosed. The process comprises (1) contacting a product mixture, which comprises acrylonitrile and hydrogen cyanide, with glycolic acid or a glycolic acid-generating compound to produce a glycolic acid-treated product; and (2) recovering the nitrile from the glycolic acid-treated product. The product mixture can be produced by contacting ammonia with an olefin under a condition effective to produce a nitrile and hydrogen cyanide.
    Type: Grant
    Filed: September 9, 1999
    Date of Patent: July 4, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Janet Marie Rogers, William Randolph Leyendecker, Robert Clifford Blackstone