Patents by Inventor George A. Kretas

George A. Kretas 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).

  • Solution waste treatment
    Patent number: 4420401
    Abstract: A process is provided for the waste treatment of metal plating solutions. One embodiment of the process comprises removal of the metal values contained in solution and inactivation or destruction of the complexing agent's ability to complex heavy metals. A second embodiment comprises inactivation or destruction of the complexing agent as a first step, formation of a sludge if not formed by inactivation of the complexing agent and sludge removal. Either embodiment permits direct discharge of spent plating solutions into the environment without violation of federal or municipal regulation.
    Type: Grant
    Filed: June 22, 1981
    Date of Patent: December 13, 1983
    Assignee: Shipley Company Inc.
    Inventors: George A. Kretas, Irving R. Ireland
  • Solution waste treatment
    Patent number: 4260493
    Abstract: A process is provided for the waste treatment of metal plating solutions One embodiment of the process comprises removal of the metal values contained in solution and inactivation or destruction of the complexing agent's ability to complex heavy metals. A second embodiment comprises inactivation or destruction of the complexing agent as a first step, formation of a sludge if not formed by inactivation of the complexing agent and sludge removal. Either embodiment permits direct discharge of spent plating solutions into the environment without violation of federal or municipal regulation.
    Type: Grant
    Filed: May 21, 1979
    Date of Patent: April 7, 1981
    Assignee: Shipley Company, Inc.
    Inventors: George A. Kretas, Irving R. Ireland