Patents by Inventor Robert Amos Hard

Robert Amos Hard 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 of explosive fracturing of a formation at depth
    Patent number: 3951458
    Abstract: This invention pertains to recovery of metal values from ore deposits found at great depth; more specifically, the invention pertains to the recovery of metal values from an ore deposit by explosive fracturing of the ore formation at a depth at which the deposit is economically inaccessible by surface mining. Still further, this invention pertains to a method for explosive fracturing of a formation containing metal values at depth whereby hydraulically assisted fracturing is used to propagate an explosive shock wave so as to obtain a more desirable medium in which metal value recovery can be practiced.
    Type: Grant
    Filed: July 31, 1974
    Date of Patent: April 20, 1976
    Assignee: Kennecott Copper Corporation
    Inventors: Lawrence Maclagan Cathles, Robert Amos Hard