Patents by Inventor Byung J. Choi

Byung J. Choi 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).

  • Publication number: 20040086793
    Abstract: A method of determining and correcting alignment during imprint lithography process is described. During an imprint lithographic process the template may be aligned with the substrate by the use of alignment marks disposed on both the template and substrate. The alignment may be determined and corrected for before the layer is processed.
    Type: Application
    Filed: May 27, 2003
    Publication date: May 6, 2004
    Applicant: University of Texas System Board of Regents, UT System
    Inventors: S. V. Sreenivasan, Byung J. Choi, Matthew Colbum, Todd Bailey
  • Publication number: 20040053146
    Abstract: A method of determining and correcting alignment during imprint lithography process is described. During an imprint lithographic process the template may be aligned with the substrate by the use of alignment marks disposed on both the template and substrate. The alignment may be determined and corrected for before the layer is processed.
    Type: Application
    Filed: May 27, 2003
    Publication date: March 18, 2004
    Applicant: University of Texas System Board of Regents, UT System
    Inventors: S.V. Sreenivasan, Byung J. Choi, Matthew Colburn, Todd Bailey
  • Patent number: 6696220
    Abstract: Described are imprint lithography templates, methods of forming and using the templates, and a template holder device. An imprint lithography template may include a body with a plurality of recesses on a surface of the body. The body may be of a material that is substantially transparent to activating light. At least a portion of the plurality of recesses may define features having a feature size less than about 250 nm. A template may be formed by obtaining a material that is substantially transparent to activating light and forming a plurality or recesses on a surface of the template. In some embodiments, a template may further include at least one alignment mark. In some embodiments, a template may further include a gap sensing area. An imprint lithography template may be used to form an imprinted layer in a light curable liquid disposed on a substrate. During use, the template may be disposed within a template holder.
    Type: Grant
    Filed: October 12, 2001
    Date of Patent: February 24, 2004
    Assignee: Board of Regents, The University of Texas System
    Inventors: Todd Bailey, Byung J. Choi, Matthew Colburn, S. V. Sreenivasan, C. Grant Willson, John Ekerdt
  • Publication number: 20040021254
    Abstract: Described are methods for patterning a substrate by imprint lithography. Imprint lithography is a process in which a liquid is dispensed onto a substrate. A template is brought into contact with the liquid and the liquid is cured. The cured liquid includes an imprint of any patterns formed in the template. Alignment of the template with the substrate is performed prior to curing the liquid. Alignment of the template with the substrate includes rotational alignment of the template with respect to the substrate.
    Type: Application
    Filed: August 1, 2002
    Publication date: February 5, 2004
    Inventors: Sidlgata V. Sreenivasan, Michael P.C. Watts, Byung J. Choi, Ronald D. Voisin
  • Publication number: 20020150398
    Abstract: Described are flexure-based high precision positioning stages. The stages are constrained to motion along each axis by a system of symmetrical flexure linkages. The linkages may be formed of link coupled by flexure joints. Magnetic linear servomotors may provide motive force for the stages. In some embodiments, the stages may have no frictional contact joints.
    Type: Application
    Filed: August 21, 2001
    Publication date: October 17, 2002
    Inventors: Byung J. Choi, S.V. Sreenivasan
  • Publication number: 20020115002
    Abstract: Described are imprint lithography templates, methods of forming and using the templates, and a template holder device. An imprint lithography template may include a body with a plurality of recesses on a surface of the body. The body may be of a material that is substantially transparent to activating light. At least a portion of the plurality of recesses may define features having a feature size less than about 250 nm. A template may be formed by obtaining a material that is substantially transparent to activating light and forming a plurality or recesses on a surface of the template. In some embodiments, a template may further include at least one alignment mark. In some embodiments, a template may further include a gap sensing area. An imprint lithography template may be used to form an imprinted layer in a light curable liquid disposed on a substrate. During use, the template may be disposed within a template holder.
    Type: Application
    Filed: October 12, 2001
    Publication date: August 22, 2002
    Inventors: Todd Bailey, Byung J. Choi, Matthew Colburn, S.V. Sreenivasan, C. Grant Willson, John Ekerdt
  • Publication number: 20020098426
    Abstract: A method of determining and correcting alignment during imprint lithography process is described. During an imprint lithographic process the template may be aligned with the substrate by the use of alignment marks disposed on both the template and substrate. The alignment may be determined and corrected for before the layer is processed.
    Type: Application
    Filed: July 16, 2001
    Publication date: July 25, 2002
    Inventors: S. V. Sreenivasan, Byung J. Choi, Matthew Colburn, Todd Bailey
  • Publication number: 20020093122
    Abstract: Described are high precision gap and orientation measurement methods between a template and a substrate used in imprint lithography processes. Gap and orientation measurement methods presented here include uses of broad-band light based measuring techniques.
    Type: Application
    Filed: August 1, 2001
    Publication date: July 18, 2002
    Inventors: Byung J. Choi, Matthew Colburn, S. V. Sreenivasan, C. Grant Willson, Todd Bailey, John Ekerdt
  • Publication number: 20020094496
    Abstract: Disclosed herein is an automatic fluid dispensing method and system for dispensing fluid on the surface of a plate-like material, or substrate, including a semiconductor wafer for imprint lithography processes. The dispensing method uses fluid dispenser and a substrate stage that may generate relative lateral motions between a fluid dispenser tip a substrate. Also described herein are methods and devices for creating a planar surface on a substrate using a substantially unpatterned planar template.
    Type: Application
    Filed: February 12, 2002
    Publication date: July 18, 2002
    Inventors: Byung J. Choi, S. V. Sreenivasan, C. Grant Willson, Matthew Colburn, Todd Bailey, John Ekerdt
  • Patent number: 5204486
    Abstract: Disclosed is a keyboard device of an electronic keyboard instrument generating a sound upon actuation of a switch disposed on a main plate by a pushing operation of a keyboard; the device includes a touch element varying in position according to the operation of the keyboard and a guide element for guiding the touch element, so that pushing force of the keyboard may be regulated. Therefore, this device enables a player to feel the same sense of touch as that in a common piano by eliminating a sense of friction which may be exerted upon his finger when pushing down the keyboard.
    Type: Grant
    Filed: April 23, 1991
    Date of Patent: April 20, 1993
    Assignee: Gold Star Co., Ltd.
    Inventors: Myung H. Kim, Woo H. Kim, Byung J. Choi