Patents by Inventor VELAPPAN KRISHNAKUMAR

VELAPPAN KRISHNAKUMAR 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 for forming a gradient thin film by spray pyrolysis
    Patent number: 10176982
    Abstract: The present invention proposes a method to form a gradient thin film using a spray pyrolysis technique. The method comprises providing a base substrate, preparing a spray aqueous solution by mixing at least two precursor compounds comprising at least two different elements and spraying the spray aqueous solution onto the base substrate. According to the present invention, the ratio of the concentration of the at least two different elements within the spray aqueous solution is varied while performing the method. In this way, a thin film having a gradient of elemental composition over its layer thickness may be formed.
    Type: Grant
    Filed: December 15, 2015
    Date of Patent: January 8, 2019
    Assignees: CHINA TRIUMPH INTERNATIONAL ENGINEERING CO., LTD., CTF SOLAR GMBH
    Inventors: Velappan Krishnakumar, Harr Michael
  • A METHOD FOR FORMING A GRADIENT THIN FILM BY SPRAY PYROLYSIS
    Publication number: 20170309477
    Abstract: The present invention proposes a method to form a gradient thin film using a spray pyrolysis technique. The method comprises providing a base substrate, preparing a spray aqueous solution by mixing at least two precursor compounds comprising at least two different elements and spraying the spray aqueous solution onto the base substrate. According to the present invention, the ratio of the concentration of the at least two different elements within the spray aqueous solution is varied while performing the method. In this way, a thin film having a gradient of elemental composition over its layer thickness may be formed.
    Type: Application
    Filed: December 15, 2015
    Publication date: October 26, 2017
    Applicants: CHINA TRIUMPH INTERNATIONAL ENGINEERING CO., LTD., CTF SOLAR GMBH
    Inventors: VELAPPAN KRISHNAKUMAR, HARR MICHAEL