Patents by Inventor Roger H. Little

Roger H. Little 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).

  • Method for the recovery of precious metals from ores
    Patent number: 4731113
    Abstract: A process for the recovery of precious metals from ore containing the same is disclosed. The process includes the formation of a lixiviant solution including a thiourea compound, urea and an alkali lignin sulfonate. The ore is then exposed to this lixiviant solution to extract the previous metals therefrom, and the dissolved previous metals are then recovered from the solution.
    Type: Grant
    Filed: August 13, 1986
    Date of Patent: March 15, 1988
    Inventor: Roger H. Little
  • Method for the recovery of precious metals from ores
    Patent number: 4645535
    Abstract: A process for the recovery of precious metals from ore containing the same is disclosed. The process includes the formation of a lixiviant solution including a thiourea compound, urea and potassium lignin sulfonate. The ore is then exposed to this lixiviant solution to extract the precious metals therefrom, and the dissolved precious metals are then recovered from the solution.
    Type: Grant
    Filed: August 15, 1985
    Date of Patent: February 24, 1987
    Inventor: Roger H. Little