Patents by Inventor Chee Kin Woo

Chee Kin Woo 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).

  • MULTI-STEP CLEARANCE OF COATING
    Publication number: 20190106994
    Abstract: Aspects of the disclosure are directed to a method for processing a component that includes a substrate and a coating coupled to the substrate, the method comprising: applying a laser beam to the coating in a first stage, the first stage characterized by a first number of pulses of the laser beam and a first offset corresponding to a focal point of the laser beam coinciding with an exterior surface of the coating, and applying the laser beam to the coating in a second stage, the second stage characterized by a second number of pulses of the laser beam and a second offset corresponding to the focal point of the laser beam being located within a span of the substrate.
    Type: Application
    Filed: October 4, 2018
    Publication date: April 11, 2019
    Inventors: Nelson Ng, Karthikeyan Baskaran, Chee Kin Woo, Balaji Rao Garimella
  • Sacrificial coating for fluoride ion cleaning
    Patent number: 7883743
    Abstract: A method of repairing a defect in a gas turbine engine component includes exposing the defect to a chemically reducing gas to clean the defect surface of undesired particles and oxidation. Before the cleaning, a protective coating is applied to the defect surface to resist inter-granular attack during the cleaning process.
    Type: Grant
    Filed: December 7, 2005
    Date of Patent: February 8, 2011
    Assignee: United Technologies Corporation
    Inventors: Sor Tin Ng, Eng Soon Ang, Seng Wee Neo, Chee Kin Woo, Tian Siang Jason Kong
  • METHOD AND APPARATUS FOR CLEANING A COMPONENT USING MICROWAVE RADIATION
    Publication number: 20100242988
    Abstract: A method for cleaning a component having an undesired substance thereon includes exposing the component to a cleaning solution and irradiating the component with microwave radiation to assist in removing the undesired substance.
    Type: Application
    Filed: May 29, 2009
    Publication date: September 30, 2010
    Inventors: Chee Kin Woo, Balaji Rao Garimella, Kok Hai Luah, Jun Hao Foo
  • MICROWAVE ASSISTED CHEMICAL STRIPPING OF COATINGS
    Publication number: 20090301515
    Abstract: A method for chemically stripping a metallic coating from a substrate is described. The coating is treated in the presence of microwave energy with a solution containing at least one acid known to dissolve the coating. The application of microwave energy accelerates the dissolution and allows for the use of diluted solutions. Coatings of interest include diffusion aluminides on superalloy substrates.
    Type: Application
    Filed: June 16, 2009
    Publication date: December 10, 2009
    Applicant: UNITED TECHNOLOGIES CORPORATION
    Inventors: Garimella Balaji Rao, Chee Kin Woo, Ranjan A/L S. Balakrishnan
  • Sacrificial coating for fluoride ion cleaning
    Publication number: 20070087208
    Abstract: A method of repairing a defect in a gas turbine engine component includes exposing the defect to a chemically reducing gas to clean the defect surface of undesired particles and oxidation. Before the cleaning, a protective coating is applied to the defect surface to resist inter-granular attack during the cleaning process.
    Type: Application
    Filed: December 7, 2005
    Publication date: April 19, 2007
    Inventors: Sor Ng, Eng Soon Ang, Seng Wee Neo, Chee Kin Woo, Tian Siang Kong