Patents by Inventor John Rakszawski

John Rakszawski 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).

  • Removal of cyanide from aqueous streams
    Patent number: 5290455
    Abstract: Cyanide present in aqueous streams, such as effluents from electroplating and gold mining operations is reduced or eliminated by contacting the cyanide-containing stream with oxygen and carbon dioxide in the presence of ferrous ions, nickelous ions or cobaltous ions. The oxygen may be provided by air or oxygen and the contacting is carried out until the pH of the aqueous stream is reduced to a value in the range of about 6 to 8 and preferably 6.5 to 7.5.
    Type: Grant
    Filed: July 14, 1992
    Date of Patent: March 1, 1994
    Assignee: The BOC Group, Inc.
    Inventor: John Rakszawski