Patents by Inventor Stanley Woyden

Stanley Woyden 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).

  • Patent number: 3964990
    Abstract: This application discloses a system for recovering silver and other precious metals from waste solutions such as those used in the development of photographic film. The system includes a holding tank from which solution is pumped into a recovery tank intermittently in dependence upon the concentration of metal in solution in the recovery tank. The system operates with a substantially constant voltage across the plates in the recovery tank, with the concentration of solution in the recovery tank being maintained substantially constant by the intermittent operation of the pump. The plating tank incorporates rotating plating surfaces in combination with a circulating system which maintains a flow of solution within the recovery tank to foster rapid and uniform plating of metal.
    Type: Grant
    Filed: November 4, 1974
    Date of Patent: June 22, 1976
    Inventor: Stanley Woyden