Patents by Inventor John A. Sievert

John A. Sievert 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).

  • In situ mining using bacteria
    Patent number: 3937520
    Abstract: Mineral values are recovered in situ by generating a leaching agent in the formation containing the mineral to be recovered.
    Type: Grant
    Filed: February 22, 1974
    Date of Patent: February 10, 1976
    Assignee: Continental Oil Company
    Inventor: John A. Sievert