Patents by Inventor Raymond John Davidson

Raymond John Davidson 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).

  • Metal, particularly gold, recovery from adsorbed cyanide complexes
    Patent number: 3970737
    Abstract: The invention provides a method of recovering transition or noble metal values, particularly gold and silver values, from a support having absorbed thereon the metal values in the form of an ionic complex, particularly a cyanide ionic complex, by desorbing the metal values with water of low cation concentration such as deionized or softened water. When the cation of the complex is an alkaline earth metal cation then the support is preferably subjected to a pre-treatment with an alkali metal salt solution to effect an exchange reaction before the desorption step.
    Type: Grant
    Filed: October 29, 1974
    Date of Patent: July 20, 1976
    Inventor: Raymond John Davidson