Patents by Inventor James D. Murff

James D. Murff 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 increasing the end-bearing capacity of open-ended piles
    Patent number: 5145284
    Abstract: A method for increasing the end-bearing capacity of an open-ended pile is disclosed. The method comprises first determining the quantity of granular material necessary to insure full mobilization of the available capacity of the soil at the tip of the pile. The granular material is then inserted within the pile on top of the soil column, thereby causing the column of granular material to plug or lock-up within the pile during transient loading and thus mobilize the available capacity.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: September 8, 1992
    Assignee: Exxon Production Research Company
    Inventors: Jeffrey M. Hulett, James D. Murff, Richard D. Raines