Patents by Inventor Lesley A. Cornish

Lesley A. Cornish 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 and system for improving the surface fracture toughness of brittle materials, and a cutting tool produced by such method
    Patent number: 12109616
    Abstract: Methods of improving the wear resistance of a cemented carbide are provided. The methods include using fracture toughness as a selection criterion and selecting a cemented carbide which has a fracture toughness between about 6 and about 15 MPa·m1/2. Cutting tools and/or cutting tool inserts prepared using methods of the disclosure are also disclosed.
    Type: Grant
    Filed: May 28, 2018
    Date of Patent: October 8, 2024
    Assignees: University of the Witwatersrand, CSIR
    Inventors: Claudia Polese, Daniel Glaser, Lesley A. Cornish, Rodney M. Genga
  • Method and System for Improving the Surface Fracture Toughness of Brittle Materials, and a Cutting Tool Produced by Such Method
    Publication number: 20200102634
    Abstract: This invention concerns a method of improving the wear resistance of a cemented carbide. The method includes using fracture toughness as a selection criterion and selecting a cemented carbide which has a fracture toughness between about 6 and about 15 MPa·m1/2. The method further includes applying a sacrificial coating to the cemented carbide and increasing the fracture toughness of the cemented carbide by creating a toughened surface layer using laser shock peening, thereby increasing its fracture resistance to fatigue and stress corrosion cracking. The invention also concerns a cutting tool or a cutting tool insert made from a cemented carbide and treated using the method according to the invention.
    Type: Application
    Filed: May 28, 2018
    Publication date: April 2, 2020
    Inventors: Claudia Polese, Daniel Glaser, Lesley A. Cornish, Rodney M. Genga