Patents by Inventor Sung-hoon Choa

Sung-hoon Choa 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).

  • Patent number: 9186700
    Abstract: A process and an apparatus for performing a UV nano-imprint lithography are provided. The process uses a polymer pad which allows a uniform application of pressure to a patterned template and an easy removal of a residual resin layer. The apparatus includes a tilt and decentering corrector which allows an accurate alignment of layers during the nano-imprint lithography process.
    Type: Grant
    Filed: October 22, 2013
    Date of Patent: November 17, 2015
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Eun-Hyoung Cho, Sung Hoon Choa, Jin Seung Sohn, Byung Kyu Lee, Du Hyun Lee
  • Patent number: 8920153
    Abstract: A nano imprint master and a method of manufacturing the same are provided. The method includes: implanting conductive metal ions into a substrate including quartz to form a conductive layer inside the quartz substrate; coating a resist on the quartz substrate in which the conductive layer is formed, to form a resist coating layer; exposing the resist coating layer to an electron beam to form micropatterns; etching the quartz substrate by using the resist coating layer, in which the micropatterns are formed, as a mask; and removing the resist coating layer to obtain a master in which micropatterns are formed.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: December 30, 2014
    Assignee: Seagate Technology LLC
    Inventors: Hae-sung Kim, Hyoung-soo Ko, Seung-bum Hong, Jin-seung Sohn, Sung-hoon Choa, Chee-kheng Lim
  • Publication number: 20140061975
    Abstract: A process and an apparatus for performing a UV nano-imprint lithography are provided. The process uses a polymer pad which allows a uniform application of pressure to a patterned template and an easy removal of a residual resin layer. The apparatus includes a tilt and decentering corrector which allows an accurate alignment of layers during the nano-imprint lithography process.
    Type: Application
    Filed: October 22, 2013
    Publication date: March 6, 2014
    Applicant: Seagate Technology LLC
    Inventors: Eun-Hyoung Cho, Sung Hoon Choa, Jin Seung Sohn, Byung Kyu Lee, Du Hyun Lee
  • Publication number: 20140004325
    Abstract: A nano imprint master and a method of manufacturing the same are provided. The method includes: implanting conductive metal ions into a substrate including quartz to form a conductive layer inside the quartz substrate; coating a resist on the quartz substrate in which the conductive layer is formed, to form a resist coating layer; exposing the resist coating layer to an electron beam to form micropatterns; etching the quartz substrate by using the resist coating layer, in which the micropatterns are formed, as a mask; and removing the resist coating layer to obtain a master in which micropatterns are formed.
    Type: Application
    Filed: September 3, 2013
    Publication date: January 2, 2014
    Inventors: Hae-sung Kim, Hyoung-soo Ko, Seung-bum Hong, Jin-seung Sohn, Sung-hoon Choa, Chee-kheng Lim
  • Patent number: 8562891
    Abstract: A process and an apparatus for performing a UV nano-imprint lithography are provided. The process uses a polymer pad which allows a uniform application of pressure to a patterned template and an easy removal of a residual resin layer. The apparatus includes a tilt and decentering corrector which allows an accurate alignment of layers during the nano-imprint lithography process.
    Type: Grant
    Filed: November 17, 2011
    Date of Patent: October 22, 2013
    Assignee: Seagate Technology LLC
    Inventors: Eun-Hyoung Cho, Sung Hoon Choa, Jin Seung Sohn, Byung Kyu Lee, Du Hyun Lee
  • Patent number: 8559279
    Abstract: A data storage device using magnetic domain wall motion may include a first magnetic layer having a plurality of magnetic domains. A second magnetic layer may be connected to the first magnetic layer, and a connection layer may be disposed between the first and second magnetic layers. A resistive magnetic layer may be disposed between each of the first and second magnetic layers and the connection layer. Accordingly, when current is supplied to the data storage device to move a magnetic domain wall, the leakage of current in a connection between the magnetic layers may be reduced or prevented, thus conserving power.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: October 15, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-chul Lee, Sung-hoon Choa, Kwang-seok Kim
  • Patent number: 8523555
    Abstract: A nano imprint master and a method of manufacturing the same are provided. The method includes: implanting conductive metal ions into a substrate including quartz to form a conductive layer inside the quartz substrate; coating a resist on the quartz substrate in which the conductive layer is formed, to form a resist coating layer; exposing the resist coating layer to an electron beam to form micropatterns; etching the quartz substrate by using the resist coating layer, in which the micropatterns are formed, as a mask; and removing the resist coating layer to obtain a master in which micropatterns are formed.
    Type: Grant
    Filed: September 15, 2012
    Date of Patent: September 3, 2013
    Assignee: Seagate Technology LLC
    Inventors: Hae-sung Kim, Hyoung-soo Ko, Seung-bum Hong, Jin-seung Sohn, Sung-hoon Choa, Chee-kheng Lim
  • Patent number: 8437160
    Abstract: Provided is a multi-stack memory device that includes a storage unit group including a plurality of storage units that are vertically stacked and form a plurality of storage unit rows, and a plurality of transistors connected to the storage unit group, wherein the transistors that are connected to the storage units which are included in at least two rows of the plurality of the storage unit rows and are connected by a common wire. The common wire may be a gate line or a bit line.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: May 7, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: In-jun Hwang, Sung-hoon Choa, Young-jin Cho, Kee-won Kim
  • Publication number: 20130064918
    Abstract: A nano imprint master and a method of manufacturing the same are provided. The method includes: implanting conductive metal ions into a substrate including quartz to form a conductive layer inside the quartz substrate; coating a resist on the quartz substrate in which the conductive layer is formed, to form a resist coating layer; exposing the resist coating layer to an electron beam to form micropatterns; etching the quartz substrate by using the resist coating layer, in which the micropatterns are formed, as a mask; and removing the resist coating layer to obtain a master in which micropatterns are formed.
    Type: Application
    Filed: September 15, 2012
    Publication date: March 14, 2013
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Hae-sung Kim, Hyoung-soo Ko, Seung-bum Hong, Jin-seung Sohn, Sung-hoon Choa, Chee-kheng Lim
  • Patent number: 8349527
    Abstract: A nano imprint master and a method of manufacturing the same are provided. The method includes: implanting conductive metal ions into a substrate including quartz to form a conductive layer inside the quartz substrate; coating a resist on the quartz substrate in which the conductive layer is formed, to form a resist coating layer; exposing the resist coating layer to an electron beam to form micropatterns; etching the quartz substrate by using the resist coating layer, in which the micropatterns are formed, as a mask; and removing the resist coating layer to obtain a master in which micropatterns are formed.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: January 8, 2013
    Inventors: Hae-sung Kim, Hyoung-soo Ko, Seung-bum Hong, Jin-seung Sohn, Sung-hoon Choa, Chee-kheng Lim
  • Patent number: 8339829
    Abstract: An information storage device using movement of magnetic domain walls includes a writing magnetic layer having a magnetic domain wall. A stack structure is formed on the writing magnetic layer. The stack structure includes a connecting magnetic layer and an information storing magnetic layer stacked sequentially. The information storage device also includes a reader for reading information stored in the information storing magnetic layer.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: December 25, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Chee-kheng Lim, Eun-hyoung Cho, Sung-hoon Choa
  • Publication number: 20120294137
    Abstract: An apparatus can include a read head formed in a semiconductor layer of an air bearing surface, the read head comprising a channel region formed between a source and drain which are doped to a higher conductivity than the channel region; wherein the channel region is configured to generate a charge carrier depletion region in response to a first ferroelectric dipole direction, and to accumulate charge carriers in response to a second ferroelectric dipole direction.
    Type: Application
    Filed: July 25, 2012
    Publication date: November 22, 2012
    Applicant: SEAGATE TECHNNOLOGY INTERNATIONAL
    Inventors: Seung-bum HONG, Sung-hoon CHOA, Ju-hwan JUNG, Hyoung-soo KO, Yong Kwan KIM
  • Publication number: 20120267703
    Abstract: Provided is an information storage medium using nanocrystal particles, a method of manufacturing the information storage medium, and an information storage apparatus including the information storage medium. The information storage medium includes a conductive layer, a first insulating layer formed on the conductive layer, a nanocrystal layer that is formed on the first insulating layer and includes conductive nanocrystal particles that can trap charges, and a second insulating layer formed on the nanocrystal layer.
    Type: Application
    Filed: June 26, 2012
    Publication date: October 25, 2012
    Applicant: Seagate Technology LLC
    Inventors: Seung-bum Hong, Simon Buehlmann, Shin-ae Jun, Sung-hoon Choa, Eun-joo Jang, Yong-kwan Kim
  • Patent number: 8248906
    Abstract: A ferroelectric hard disk device is provided and includes: a ferroelectric media having a bottom electrode and a ferroelectric layer disposed on the bottom electrode; and a head formed above the ferroelectric media, the head being operative to write and reproduce information on the ferroelectric layer.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: August 21, 2012
    Assignee: Seagate Technology International, LLC
    Inventors: Seung-bum Hong, Sung-hoon Choa, Ju-hwan Jung, Hyoung-soo Ko, Yong Kwan Kim
  • Patent number: 8206803
    Abstract: Provided is an information storage medium using nanocrystal particles, a method of manufacturing the information storage medium, and an information storage apparatus including the information storage medium. The information storage medium includes a conductive layer, a first insulating layer formed on the conductive layer, a nanocrystal layer that is formed on the first insulating layer and includes conductive nanocrystal particles that can trap charges, and a second insulating layer formed on the nanocrystal layer.
    Type: Grant
    Filed: September 12, 2007
    Date of Patent: June 26, 2012
    Assignee: Seagate Technology International
    Inventors: Seung-bum Hong, Simon Buehlmann, Shin-ae Jun, Sung-hoon Choa, Eun-joo Jang, Yong-kwan Kim
  • Publication number: 20120056355
    Abstract: A process and an apparatus for performing a UV nano-imprint lithography are provided. The process uses a polymer pad which allows a uniform application of pressure to a patterned template and an easy removal of a residual resin layer. The apparatus includes a tilt and decentering corrector which allows an accurate alignment of layers during the nano-imprint lithography process.
    Type: Application
    Filed: November 17, 2011
    Publication date: March 8, 2012
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Eun-Hyoung CHO, Sung Hoon CHOA, Jin Seung SOHN, Byung Kyu LEE, Du Hyun LEE
  • Patent number: 8087920
    Abstract: A process and an apparatus for performing a UV nano-imprint lithography are provided. The process uses a polymer pad which allows a uniform application of pressure to a patterned template and an easy removal of a residual resin layer. The apparatus includes a tilt and decentering corrector which allows an accurate alignment of layers during the nano-imprint lithography process.
    Type: Grant
    Filed: February 4, 2008
    Date of Patent: January 3, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Eun-Hyoung Cho, Sung Hoon Choa, Jin Seung Sohn, Byung Kyu Lee, Du Hyun Lee
  • Publication number: 20110223279
    Abstract: A nano imprint master and a method of manufacturing the same are provided. The method includes: implanting conductive metal ions into a substrate including quartz to form a conductive layer inside the quartz substrate; coating a resist on the quartz substrate in which the conductive layer is formed, to form a resist coating layer; exposing the resist coating layer to an electron beam to form micropatterns; etching the quartz substrate by using the resist coating layer, in which the micropatterns are formed, as a mask; and removing the resist coating layer to obtain a master in which micropatterns are formed.
    Type: Application
    Filed: May 23, 2011
    Publication date: September 15, 2011
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hae-sung Kim, Hyoung-soo Ko, Seung-bum Hong, Jin-seung Sohn, Sung-hoon Choa, Chee-kheng Lim
  • Publication number: 20110207240
    Abstract: An information storage device using movement of magnetic domain walls includes a writing magnetic layer having a magnetic domain wall. A stack structure is formed on the writing magnetic layer. The stack structure includes a connecting magnetic layer and an information storing magnetic layer stacked sequentially. The information storage device also includes a reader for reading information stored in the information storing magnetic layer.
    Type: Application
    Filed: April 25, 2011
    Publication date: August 25, 2011
    Inventors: Chee-kheng Lim, Eun-hyoung Cho, Sung-hoon Choa
  • Patent number: 7968253
    Abstract: A nano imprint master and a method of manufacturing the same are provided. The method includes: implanting conductive metal ions into a substrate including quartz to form a conductive layer inside the quartz substrate; coating a resist on the quartz substrate in which the conductive layer is formed, to form a resist coating layer; exposing the resist coating layer to an electron beam to form micropatterns; etching the quartz substrate by using the resist coating layer, in which the micropatterns are formed, as a mask; and removing the resist coating layer to obtain a master in which micropatterns are formed.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: June 28, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hae-sung Kim, Hyoung-soo Ko, Seung-bum Hong, Jin-seung Sohn, Sung-hoon Choa, Chee-kheng Lim