Patents by Inventor Larry C. Hoffman

Larry C. Hoffman 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).

  • Friction stabilizer pull tester and method
    Patent number: 10060809
    Abstract: Friction stabilizer pull tester apparatus and method for testing friction stabilizer type rock bolts including a pull tester toolhead comprising a tension rod with a radially expanding collet device inserted and expanded in a friction stabilizer steel tube. A confining collar on the tension rod for restricting longitudinal movement of the expanding device and outward deformation of the friction stabilizer tube at a friction stabilizer ring flange. A pre-tensioning device applies an initial force to seat apparatus and a pulling apparatus applies a greater load force to the tension rod to determine load capacity of the friction stabilizer.
    Type: Grant
    Filed: September 6, 2017
    Date of Patent: August 28, 2018
    Inventor: Larry C. Hoffman