Patents by Inventor William C. Chard

William C. Chard 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).

  • Hydraulic fracturing method using sintered bauxite propping agent
    Patent number: 4068718
    Abstract: An improved method of fracturing a subterranean formation wherein particles composed of sintered bauxite are placed in the formation fracture to maintain the walls of the fracture spaced apart. The sintered bauxite particles have a specific gravity greater than 3.4 and are prepared from bauxite material having a grain size of about 12 microns or less.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: January 17, 1978
    Assignee: Exxon Production Research Company
    Inventors: Claude E. Cooke, Jr., Walter A. Hedden, William C. Chard