Patents by Inventor Andrew L. Purvis

Andrew L. Purvis 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 of forming aluminide diffusion coatings
    Patent number: 7273635
    Abstract: Method of forming an outwardly grown aluminide diffusion coating on a superalloy substrate disposed in a coating retort including the steps of heating the substrate to a temperature of 900 to 1200 degrees C., flowing a coating gas comprising aluminum trichloride and a carrier gas through the coating retort at a flow rate of the coating gas of about 100 to about 450 standard cubic feet per hour, providing a concentration of aluminum trichloride in the retort of less than 1.4% by volume of the coating gas, and providing a total pressure of the coating gas in the coating retort of about 100 to about 450 Torr.
    Type: Grant
    Filed: September 29, 2003
    Date of Patent: September 25, 2007
    Assignee: Howmet Corporation
    Inventors: Andrew L. Purvis, Bruce M. Warnes, Irving R. McFarren, Joel L. Cockerill
  • Chemical vapor deposition apparatus and method
    Patent number: 6911234
    Abstract: Chemical vapor deposition apparatus and method are provided with coating gas distribution and exhaust systems that provide more uniform coating gas temperature and coating gas flow distribution among a plurality of distinct coating zones disposed along the length of a coating chamber.
    Type: Grant
    Filed: May 24, 2004
    Date of Patent: June 28, 2005
    Assignee: Howmet Corporation
    Inventors: Bruce M. Warnes, Andrew L. Purvis, Daniel L. Near
  • Chemical vapor deposition apparatus and method
    Patent number: 6793966
    Abstract: Chemical vapor deposition apparatus and method are provided with external metal halide gas generators that reduce leakage of air into the generators so as to improve efficiency of use of the metal charge residing in each generator.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: September 21, 2004
    Assignee: Howmet Research Corporation
    Inventors: Bruce M. Warnes, Andrew L. Purvis, Daniel L. Near
  • Chemical vapor deposition apparatus and method
    Publication number: 20030049374
    Abstract: Chemical vapor deposition apparatus and method are provided with coating gas distribution and exhaust systems that provide more uniform coating gas temperature and coating gas flow distribution among a plurality of distinct coating zones disposed along the length of a coating chamber.
    Type: Application
    Filed: September 10, 2001
    Publication date: March 13, 2003
    Inventors: Bruce M. Warnes, Andrew L. Purvis, Daniel L. Near
  • Coating gas generator and method
    Publication number: 20030047141
    Abstract: Chemical vapor deposition apparatus and method are provided with external metal halide gas generators that reduce leakage of air into the generators so as to improve efficiency of use of the metal charge residing in each generator.
    Type: Application
    Filed: September 10, 2001
    Publication date: March 13, 2003
    Inventors: Bruce M. Warnes, Andrew L. Purvis, Daniel L. Near
  • Solidification control including pattern recognition
    Patent number: 5841669
    Abstract: A method of predicting a grain condition in a directionally solidified casting, comprises generating thermal history data for a directional solidification casting process, determining a plurality of casting process variables that statistically influence a plurality of different grain conditions, identifying each grain condition by determining a function containing values of each selected variable, and categorizing the selected variables with respect to variance among and between the different grain conditions to determine a pattern between the selected variable and the grain conditions.
    Type: Grant
    Filed: January 26, 1996
    Date of Patent: November 24, 1998
    Assignee: Howmet Research Corporation
    Inventors: Andrew L. Purvis, Christopher R. Hanslits, Randall S. Diehm