Patents by Inventor Herbert A. Hancock

Herbert A. Hancock 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).

  • Obtaining aqueous solution from insoluble metal oxide
    Patent number: 4645650
    Abstract: This method of obtaining an aqueous solution of metal values from an insoluble metal oxide is possible where the metal has a lower oxidation number in the solution than in the insoluble oxide, for example manganese (+2 and +4 respectively).The oxide, such as MnO.sub.2, is treated with hot mineral acid such as HCl in the presence of coal. After some hours, the liquid comes to contain most of the manganese as dissolved Mn(II) ion.
    Type: Grant
    Filed: July 5, 1985
    Date of Patent: February 24, 1987
    Assignee: National Research Development Corporation
    Inventors: Derek J. Fray, Herbert A. Hancock