Patents by Inventor Andrew P. Spence

Andrew P. Spence 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 a material
    Patent number: 4082359
    Abstract: The present invention relates to an improved method for the solution mining of a mineral from a subterranean formation. More specifically, the invention relates to an improved method which enhances significantly the recovery of the mineral from a subterranean formation via solution mining. The improvement comprises switching a well which initially functions as a producer to an injector and vice versa after oxidant breakthrough has occurred at a production well.
    Type: Grant
    Filed: August 17, 1976
    Date of Patent: April 4, 1978
    Assignees: Atlantic Richfield Company, NM Uranium, Inc., United States Steel Corporation
    Inventor: Andrew P. Spence
  • Process for the recovery of uranium
    Patent number: 4066297
    Abstract: The present invention relates to a process for the solution mining of uranium from a subterranean formation. More specifically, the invention relates to the injection of an alkaline leach solution undersaturated in carbonates into a subterranean formation for the mining of uranium.
    Type: Grant
    Filed: June 1, 1976
    Date of Patent: January 3, 1978
    Assignee: Atlantic Richfield Company
    Inventor: Andrew P. Spence