Patents by Inventor Kyung Hyun Hwang

Kyung Hyun Hwang 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: 11990605
    Abstract: A lithium secondary battery comprises a cathode formed from a cathode active material including a first cathode active material particle and a second cathode active material particle, an anode and a separator interposed between the cathode and the anode. The first cathode active material particle includes a lithium metal oxide including a continuous concentration gradient in at least one region between a central portion and a surface portion. The second cathode active material particle includes a constant concentration composition.
    Type: Grant
    Filed: May 9, 2022
    Date of Patent: May 21, 2024
    Assignee: SK ON CO., LTD.
    Inventors: Duck Chul Hwang, Kyung Bin Yoo, Kook Hyun Han
  • Patent number: 11984595
    Abstract: A lithium secondary battery includes a cathode formed from a cathode active material including a cathode active material particle having a specific concentration ratio, an anode; and a separation layer interposed between the cathode and the anode. The lithium secondary battery has improved formation discharge amount, formation discharge efficiency and power output.
    Type: Grant
    Filed: October 12, 2021
    Date of Patent: May 14, 2024
    Assignee: SK ON CO., LTD.
    Inventors: Kyung Bin Yoo, Kook Hyun Han, Duck Chul Hwang
  • Publication number: 20240120323
    Abstract: The present disclosure relates to an apparatus for fabricating a display panel including: an attachment member having a fixing portion in a pressurization direction to which a pressurization header is fixed, an attachment driving member configured to move the attachment member and the pressurization header in the pressurization direction or a detachment direction through a fixing frame of the attachment member, a first pressure sensing module between the pressurization header and the attachment member and configured to generate first pressure detection signals according to pressure applied to the pressurization header, a gradient setting module configured to set a gradient of the pressurization header based on magnitudes of the first pressure detection signals, and a gradient control module configured to adjust gradients of the pressurization header, the attachment member, and the fixing frame according to control of the gradient setting module.
    Type: Application
    Filed: September 6, 2023
    Publication date: April 11, 2024
    Inventors: Tae Hee LEE, Sung Kook PARK, Kyung Ho KIM, Young Seok SEO, Jae Gwang UM, Sang Hyun LEE, Hyung Suk HWANG
  • Patent number: 11936041
    Abstract: A lithium secondary battery includes a cathode formed from a cathode active material including a first cathode active material particle and a second cathode active material particle, an anode and a separator interposed between the cathode and the anode. The first cathode active material particle includes a lithium metal oxide including a continuous concentration gradient in at least one region between a central portion and a surface portion. The second cathode active material particle includes a lithium metal oxide including elements the same as those of the first cathode active material particle, and the second cathode active material particle has a uniform composition from a central portion to a surface.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: March 19, 2024
    Assignee: SK ON CO., LTD.
    Inventors: Kook Hyun Han, Kyung Bin Yoo, Duck Chul Hwang
  • Publication number: 20100091107
    Abstract: The present invention discloses a high speed optical monitoring system being capable of monitoring clearly a subject at a high speed and having a small dimension.
    Type: Application
    Filed: December 2, 2008
    Publication date: April 15, 2010
    Applicant: KOREA INSTITUTE OF MACHINERY & MATERIALS
    Inventors: Dong Youn SHIN, Kyung Hyun HWANG, Taik Min LEE, Dong Soo KIM
  • Publication number: 20090302506
    Abstract: Provided are ultra water repellent film manufacturing equipment capable of continuous manufacturing of an ultra water repellent film through casting and separating a hydrophilic or hydrophobic polymer on an outer surface of a rotating belt, and an ultra water repellent film manufacturing method using the equipment. The equipment includes the rotating belt wound around rollers to continuously rotate, a polymer supplying member (120) containing a liquid polymer (M) to supply onto the rotating belt (110), a thickness controlling member (130) for controlling the supplied liquid polymer in thickness, a polymer drying member (140) for drying the liquid polymer controlled in thickness, a film separating member (150) for separating an ultra water repellent film (F) from the rotating belt, a rotating belt cleaning member (160) for cleaning an outer surface of the rotating belt after film separation, and a surface reforming member (170) for reforming the outer surface of the cleaned rotating belt.
    Type: Application
    Filed: December 19, 2008
    Publication date: December 10, 2009
    Inventors: Jong Joo Rha, Gun Hwan Lee, Kyung Hyun Hwang, Doo Sun Choi
  • Patent number: 7138748
    Abstract: The present invention relates to a method of enlarging a travel of a piezoelectric sensor and a MEMS switch employing an enlarging means employing the leverage theory. In accordance with the present invention, there is provided a MEMS switch capable of using a relatively low voltage, less than 5V, lowering power consumption isolation and insertion loss, and having application to a wide range of wireless communication systems such as PCS and wireless LAN.
    Type: Grant
    Filed: March 30, 2004
    Date of Patent: November 21, 2006
    Assignee: Korea Institute of Machinery & Materials
    Inventors: Doo Sun Choi, Taik Min Lee, Tae Jin Jae, Kyung Hyun Hwang
  • Publication number: 20040264878
    Abstract: The present invention relates to a method of enlarging a travel of piezoelectric sensor and a MEMS switch employing the enlarged travel of piezoelectric sensor. The MEMS switch provided with an enlarging means employing the leverage theory. In accordance with the present invention, there is provided a MEMS switch capable of using a relatively low voltage less than 5V, lowering a power consumption, isolation and insertion loss, and applying to wide range of wireless communication such as PCS, wireless LAN etc.
    Type: Application
    Filed: March 30, 2004
    Publication date: December 30, 2004
    Inventors: Doo Sun Choi, Taik Min Lee, Tae Jin Jae, Kyung Hyun Hwang