Patents by Inventor Edward L. Cussler, Jr.

Edward L. Cussler, Jr. 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 metal and cyanide recovery from plating baths and rinse waters
    Patent number: 4895659
    Abstract: A method for recovery of metal and cyanide from plating baths and rinse waters includes formation of hydrogen cyanide by acid treatment of such solutions, followed by HCN removal through diffusion across a microporous membrane. The method is applicable in a system wherein soluable metal cyanides and metal cyanide complexes are concentrated through use of a basic anion exchange system. Free hydrogen cyanide is released from the anion exchange system by means of an acid regenerant. In a preferred application of the invention, HCN, once having diffused through the microporous membrane, is neutralized with sodium hydroxide, to form a sodium cyanide solution that can be returned to a plating bath.
    Type: Grant
    Filed: April 30, 1987
    Date of Patent: January 23, 1990
    Assignee: Regents of the University of Minnesota
    Inventors: Michael J. Semmens, Edward L. Cussler, Jr.