Patents by Inventor Do Hyun Ryu

Do Hyun Ryu 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 SYNTHESIZING COMPOUND IN WHICH ACETOXYLATION REACTION IS APPLIED TO LACTIC ACID DERIVATIVE
    Publication number: 20240199526
    Abstract: A synthesis method according to the present disclosure includes preparing a mixture by mixing a lactic acid derivative, alkyl acetate, and methane sulfonic acid, and obtaining a final product by inputting alkyl acetate in the process of removing a distillate through fractional distillation of the mixture.
    Type: Application
    Filed: May 26, 2023
    Publication date: June 20, 2024
    Inventors: Jong Geun Sung, Sung Wan Jeon, Do Hyun Ryu, Dong Guk Nam
  • Pyrrolopyrimidinone derivatives, process of preparation and use
    Patent number: 6962911
    Abstract: The invention relates to a series of pyrrolopyrimidinone derivatives of the formula (1): wherein R1 is H; C1-C3 alkyl optionally substituted with one or more fluoro atoms; or C3-C6 cycloalkyl; R2 is H; a halogen atom; C1-C6 alkyl optionally substituted with OH, C1-C3 alkoxy, C3-C6 cycloalkyl, or with one or more fluoro atoms; C3-C6 cycloalkyl; C2-C6 alkenyl; or C2-C6 alkynyl; R3 is H; C1-C6 alkyl optionally substituted with OH, C1-C3 alkoxy, C3-C6 cycloalkyl, or with one or more fluoro atoms; C3-C6 cycloalkyl; C2-C6 alkenyl; or C2-C6 alkynyl; R4 is C1-C6 alkyl optionally substituted with C3-C6 cycloalkyl or with one or more fluoro atoms; C2-C6 alkenyl; C2-C6 alkynyl; or C3-C6 cycloalkyl; and R5 is SO2NR6R7; NHSO2NR6R7; NHCOCONR6R7; NHSO2R8; NHCOR8; or phenyl or heterocyclyl either of which is optionally substituted with one or more fluoro atoms or C1-C3 alkyl.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: November 8, 2005
    Assignees: SK Chemicals Co., Ltd., In2Gen Co., Ltd.
    Inventors: Dae-Kee Kim, Ju Young Lee, Do Hyun Ryu, Nam Kyu Lee, Suk Ho Lee, Nam-Ho Kim, Jae-Sun Kim, Je Ho Ryu, Jin-Young Choi, Guang-Jin Im, Won-Son Choi, Tae Kon Kim, Hoon Cha
  • Pyrrolopyrimidinone derivatives, process of preparation and use
    Publication number: 20030171361
    Abstract: The invention relates to a series of pyrrolopyrimidinone derivatives of the formula (1), processes for their preparation, intermediates in their preparation, their use as therapeutic agents, and pharmaceutical compositions containing them.
    Type: Application
    Filed: December 2, 2002
    Publication date: September 11, 2003
    Inventors: Dae-Kee Kim, Ju Young Lee, Do Hyun Ryu, Nam Kyu Lee, Suk Ho Lee, Nam-Ho Kim, Jae-Sun Kim, Je Ho Ryu, Jin-Young Choi, Guang-Jin Im, Won-Son Choi, Tae Kon Kim, Hoon Cha
  • Automatic chip-loading apparatus
    Patent number: 5743695
    Abstract: An automatic chip-loading apparatus including a wafer loading mechanism on which a wafer with sawed chips is loaded; a tray loading/unloading mechanism installed on one side of the wafer loading mechanism for loading empty trays and unloading trays with chips; a tray carrying mechanism for taking out an empty tray from the tray loading/unloading mechanism and loading the tray on the tray loading/unloading mechanism when a predetermined number of chips are mounted on the empty tray; and a chip carrying mechanism for carrying chips selected from the wafer onto an empty tray taken out from the tray loading/unloading mechanism.
    Type: Grant
    Filed: June 23, 1995
    Date of Patent: April 28, 1998
    Assignee: LG Semicon Co., Ltd.
    Inventor: Do Hyun Ryu