Patents by Inventor Duk-hwa NA

Duk-hwa NA 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-layered graphene sheet and method of fabricating the same
    Patent number: 10040683
    Abstract: A method of fabricating multi-layered graphene includes disposing a first graphene layer on a carrier; disposing at least one second graphene layer on the first graphene layer to form a graphene sheet disposed on the carrier; and transferring the graphene sheet disposed on the carrier onto a substrate, wherein each of the graphene layers which constitute the graphene sheet has at least one damaged region, and the at least one damaged region of each of the graphene layers contacts at least one of non-damaged regions of a graphene layer or graphene layers, of the graphene layers, contacting the each of the graphene layers.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: August 7, 2018
    Assignees: SUNGKYUNKWAN UNIVERSITY FOUNDATION FOR CORPORATE COLLABORATION, Hanwha Techwin Co., Ltd.
    Inventors: Jong-hyuk Yoon, Duk-hwa Na, Young-il Song, Dong-kwan Won, Byung-hee Hong, Na-young Kim
  • Method and apparatus for transferring graphene
    Patent number: 9315001
    Abstract: Provided are method and apparatus for transferring graphene. The graphene transferring method includes: a graphene synthesizing operation comprising forming at least one layer of graphene on at least one surface of a catalyst metal film; a substrate film attaching operation comprising contacting an adhesive first surface of the substrate film to the at least one layer of graphene and compressing the catalyst metal film and the substrate film by using a first roller; and a substrate film separating operation comprising separating the substrate film from the catalyst metal film such that the at least one layer of graphene is separated from the catalyst metal film together with the substrate film.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: April 19, 2016
    Assignee: Hanwha Techwin Co., Ltd.
    Inventors: Duk-Hwa Na, Jong-Hyuk Yoon, Young-Il Song, Dong-Kwan Won
  • METHOD AND APPARATUS FOR TRANSFERRING GRAPHENE
    Publication number: 20130233480
    Abstract: Provided are method and apparatus for transferring graphene. The graphene transferring method includes: a graphene synthesizing operation comprising forming at least one layer of graphene on at least one surface of a catalyst metal film; a substrate film attaching operation comprising contacting an adhesive first surface of the substrate film to the at least one layer of graphene and compressing the catalyst metal film and the substrate film by using a first roller; and a substrate film separating operation comprising separating the substrate film from the catalyst metal film such that the at least one layer of graphene is separated from the catalyst metal film together with the substrate film.
    Type: Application
    Filed: November 17, 2011
    Publication date: September 12, 2013
    Applicant: SAMSUNG TECHWIN CO., LTD.
    Inventors: Duk-Hwa Na, Jong-Hyuk Yoon, Young-Il Song, Dong-Kwan Won
  • MULTI-LAYERED GRAPHENE SHEET AND METHOD OF FABRICATING THE SAME
    Publication number: 20120128983
    Abstract: A method of fabricating multi-layered graphene includes disposing a first graphene layer on a carrier; disposing at least one second graphene layer on the first graphene layer to form a graphene sheet disposed on the carrier; and transferring the graphene sheet disposed on the carrier onto a substrate, wherein each of the graphene layers which constitute the graphene sheet has at least one damaged region, and the at least one damaged region of each of the graphene layers contacts at least one of non-damaged regions of a graphene layer or graphene layers, of the graphene layers, contacting the each of the graphene layers.
    Type: Application
    Filed: November 17, 2011
    Publication date: May 24, 2012
    Applicants: SUNGKYUNKWAN UNIVERSITY FOUNDATION FOR CORPORATE COLLABORATION, SAMSUNG TECHWIN CO., LTD.
    Inventors: Jong-hyuk YOON, Duk-hwa NA, Young-il SONG, Dong-kwan WON, Byung-hee HONG, Na-young KIM