Patents by Inventor Andrew Jonathan LEGGETT

Andrew Jonathan LEGGETT 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).

  • Erosion resistant coating
    Patent number: 9777583
    Abstract: A platinum plus chromium coating applied to the roots and firtrees of turbine blades where the inclusion of chromium creates a single phase outer zone which minimizes diffusion paths for sulphur which can preferentially diffuse down phase boundaries and enables a chromium rich outer oxide scale to form on top of the coating.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: October 3, 2017
    Assignee: ROLLS-ROYCE PLC
    Inventor: Andrew Jonathan Leggett
  • Method of fatigue testing a component
    Patent number: 9170182
    Abstract: A method of fatigue testing a component comprising the steps of machining a channel of predetermined depth and predetermined width in a surface of a component, applying a salt solution into the channel in the surface of the component and heating the component to a suitable temperature to evaporate the solvent from the salt solution to deposit the salt in the channel in the surface of the component, placing the component in an atmosphere containing air and sulphur dioxide at a predetermined temperature for a predetermined period of time to precondition the grain boundaries, and fatigue testing the component. The method is useful for determining the fatigue life of gas turbine engine discs or gas turbine engine rotor blades particularly the firtree shaped disc posts or the firtree shaped rotor blade roots.
    Type: Grant
    Filed: April 5, 2013
    Date of Patent: October 27, 2015
    Assignee: ROLLS-ROYCE PLC
    Inventors: Grant Gibson, Andrew Jonathan Leggett
  • EROSION RESISTANT COATING
    Publication number: 20140271220
    Abstract: A platinum plus chromium coating applied to the roots and firtrees of turbine blades where the inclusion of chromium creates a single phase outer zone which minimises diffusion paths for sulphur which can preferentially diffuse down phase boundaries and enables a chromium rich outer oxide scale to form on top of the coating.
    Type: Application
    Filed: February 18, 2014
    Publication date: September 18, 2014
    Applicant: ROLLS-ROYCE PLC
    Inventor: Andrew Jonathan LEGGETT
  • METHOD OF FATIGUE TESTING A COMPONENT
    Publication number: 20130298693
    Abstract: A method of fatigue testing a component comprising the steps of machining a channel of predetermined depth and predetermined width in a surface of a component, applying a salt solution into the channel in the surface of the component and heating the component to a suitable temperature to evaporate the solvent from the salt solution to deposit the salt in the channel in the surface of the component, placing the component in an atmosphere containing air and sulphur dioxide at a predetermined temperature for a predetermined period of time to precondition the grain boundaries, and fatigue testing the component. The method is useful for determining the fatigue life of gas turbine engine discs or gas turbine engine rotor blades particularly the firtree shaped disc posts or the firtree shaped rotor blade roots.
    Type: Application
    Filed: April 5, 2013
    Publication date: November 14, 2013
    Applicant: ROLLS-ROYCE PLC
    Inventors: Grant GIBSON, Andrew Jonathan LEGGETT