Patents by Inventor Leanne Lehman

Leanne Lehman 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).

  • Composite structure having ceramic truss core and method for making the same
    Patent number: 9782951
    Abstract: A CMC sandwich used to fabricate CMC structures includes facesheets bonded to a core reinforced with a ceramic truss comprising an array of CMC pins. The binder matrix in the ends of the pins is removed, leaving exposed, flexible ceramic fibers. The exposed ceramic fibers are bent so as to extend parallel to the facesheets, and are bonded to one or more plies of the facesheets. The binder matrix in the ends of the ceramic pins may be removed by mechanical or chemical processes.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: October 10, 2017
    Assignee: THE BOEING COMPANY
    Inventors: William P. Keith, Buddhadev Chakrabarti, Leanne Lehman
  • Method for making hybrid metal-ceramic matrix composite structures and structures made thereby
    Patent number: 8715439
    Abstract: A laminated ceramic matrix composite structure is strengthened with one or more layers of a metal reinforcement. The metal reinforcement is selected to provide optimal strength and thermal compatibility with the ceramic matrix composite. The metal reinforcement includes an outer oxidized layer that bonds to the ceramic matrix composite. It may also include a barrier layer on the surface of the metal that helps prevent further oxidation. The structure is formed using standard composite prepreg layup techniques.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: May 6, 2014
    Assignee: The Boeing Company
    Inventors: Buddhadev Chakrabarti, Leanne Lehman, Ali Yousefiani, William P. Keith
  • Method for Making Hybrid Metal-Ceramic Matrix Composite Structures and Structures Made Thereby
    Publication number: 20090226746
    Abstract: A laminated ceramic matrix composite structure is strengthened with one or more layers of a metal reinforcement. The metal reinforcement is selected to provide optimal strength and thermal compatibility with the ceramic matrix composite. The metal reinforcement includes an outer oxidized layer that bonds to the ceramic matrix composite. It may also include a barrier layer on the surface of the metal that helps prevent further oxidation. The structure is formed using standard composite prepreg layup techniques.
    Type: Application
    Filed: March 7, 2008
    Publication date: September 10, 2009
    Inventors: Buddhadev Chakrabarti, Leanne Lehman, Ali Yousefiani, William P. Keith
  • Composite Structure having Ceramic Truss Core and Method for Making the Same
    Publication number: 20090019685
    Abstract: A CMC sandwich used to fabricate CMC structures includes facesheets bonded to a core reinforced with a ceramic truss comprising an array of CMC pins. The binder matrix in the ends of the pins is removed, leaving exposed, flexible ceramic fibers. The exposed ceramic fibers are bent so as to extend parallel to the facesheets, and are bonded to one or more plies of the facesheets. The binder matrix in the ends of the ceramic pins may be removed by mechanical or chemical processes.
    Type: Application
    Filed: July 18, 2007
    Publication date: January 22, 2009
    Inventors: William P. Keith, Buddhadev Chakrabarti, Leanne Lehman