Patents by Inventor Hojae Choi
Hojae 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).
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Publication number: 20240122059Abstract: A compound of Formula I, is provided. In Formula I, one of Z1, Z2, and Z3 is N and the remainder are C; each of L1 and L2 is independently selected from a direct bond and a linking group; at least one of R1, R2, RA, RB, RC, RD, and RE comprises a group R* having a structure selected form the group consisting of Formula II, -Q(R3)(R4)a(R5)b, Formula III, and Formula IV, Each R, R?, R?, R1, R2, R3, R4, R5, RA, RB, RC, RD, RE, RF, RG, and RH is independently hydrogen or a General Substituent, with the proviso that group R* is not adamantyl. Formulations, OLEDs, and consumer products containing the compound are also provided.Type: ApplicationFiled: September 27, 2023Publication date: April 11, 2024Applicant: UNIVERSAL DISPLAY CORPORATIONInventors: Hsiao-Fan CHEN, Geza SZIGETHY, Rasha HAMZE, Nicholas J. THOMPSON, Hojae CHOI, Weiye GUAN, Raghupathi NEELARAPU, Charles J. STANTON, Douglas WILLIAMS, Ving Jick LEE, Joseph A. MACOR, Dmitry ANDRIANOV, Chao LIANG, Steven Kit CHOW, Tyler FLEETHAM, Peter WOLOHAN, Morgan C. MACINNIS
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Publication number: 20230159578Abstract: A compound of Formula I, is provided. In Formula I, one of Z1, Z2, and Z3 is N and the remainder are C; each of L1 and L2 is independently selected from a direct bond and a linking group; at least one of R1, R2, RA, RB, RC, RD, and RE comprises a group R* having a structure selected form the group consisting of Formula II, -Q(R3)(R4)a(R5)b, Formula III, and Formula IV, Each R, R?, R?, R1, R2, R3, R4, R5, RA, RB, RC, RD, RE, RF, RG, and RH is independently hydrogen or a General Substituent, with the proviso that group R* is not adamantyl. Formulations, OLEDs, and consumer products containing the compound are also provided.Type: ApplicationFiled: January 4, 2023Publication date: May 25, 2023Applicant: UNIVERSAL DISPLAY CORPORATIONInventors: Hsiao-Fan CHEN, Geza SZIGETHY, Rasha HAMZE, Nicholas J. THOMPSON, Hojae CHOI, Weiye GUAN, Raghupathi NEELARAPU, Charles J. STANTON, Douglas WILLIAMS, Ving Jick LEE
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Publication number: 20230144155Abstract: Syringes are described herein. In certain embodiments, a syringe includes a syringe body, a movable plunger, and a biasing member. The syringe body defines a cavity and a port in fluid communication with the cavity. The movable plunger is disposed within the cavity. The plunger and cavity define a volume. The port is in fluid communication with the volume. The biasing member is coupled to the plunger. The biasing member is configured to urge the plunger toward the port to dispense a fluid stored within the volume at a desired rate.Type: ApplicationFiled: November 3, 2022Publication date: May 11, 2023Inventors: Janice R. PAK, Edmond Yu, Hojae Choi, Lun Zhang, Vincent F. Wang, Wesley Underwood
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Publication number: 20230065887Abstract: A compound of Formula I, is provided. In Formula I, one of Z1, Z2, and Z3 is N and the remainder are C; each of L1 and L2 is independently selected from a direct bond and a linking group; at least one of R1, R2, RA, RB, RC, RD, and RE comprises a group R* having a structure selected form the group consisting of Formula II, -Q(R3)(R4)a(R5)b, Formula III, and Formula IV, Each R, R?, R?, R1, R2, R3, R4, R5, RA, RB, RC, RD, RE, RF, RG, and RH is independently hydrogen or a General Substituent, with the proviso that group R* is not adamantyl. Formulations, OLEDs, and consumer products containing the compound are also provided.Type: ApplicationFiled: August 31, 2022Publication date: March 2, 2023Applicant: UNIVERSAL DISPLAY CORPORATIONInventors: Hsiao-Fan CHEN, Geza SZIGETHY, Rasha HAMZE, Nicholas J. THOMPSON, Hojae CHOI, Weiye GUAN, Raghupathi NEELARAPU, Charles J. STANTON, Douglas WILLIAMS, Ving Jick LEE
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Publication number: 20210292351Abstract: Disclosed are platinum or palladium complexes featuring tetradentate ligands with at least one side that has an NN binding motif are disclosed. The disclosed organometallic compounds have a structure of where M is Pt or Pd. Also provided are formulations comprising these organometallic compounds. Further provided are OLEDs and related consumer products that utilize these organometallic compounds.Type: ApplicationFiled: February 1, 2021Publication date: September 23, 2021Applicant: UNIVERSAL DISPLAY CORPORATIONInventors: Morgan C. MACINNIS, Woo-Young SO, Hsiao-Fan CHEN, Tyler FLEETHAM, Jason BROOKS, Douglas WILLIAMS, Charles J. STANTON, III, Satwinder Singh MAROK, Hojae CHOI
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Patent number: 10926118Abstract: A safety handle of a fire extinguisher includes a lower handle coupled to an upper end of a valve and having a first hinge shaft at one end thereof and a first support shaft parallel to the first hinge shaft at a point spaced from the first hinge shaft. An upper handle is coupled to the lower handle to be rotatable around the first hinge shaft and downwardly rotate around the first hinge shaft to push an open pin of the fire extinguisher. A second support shaft is parallel to the first hinge shaft at one point. A safety pin prevents the upper handle from rotating. A first link having a first end of a length direction is coupled to the first support shaft to be rotatable around the first support shaft. A second link having a first end of a length direction is coupled to the second support shaft.Type: GrantFiled: May 24, 2016Date of Patent: February 23, 2021Assignee: TOP ENGINEERING AND CONSTRUCTION CO., LTD.Inventors: Hojae Choi, Seungwook Han, Kooksang Sim, Seongdae Choi, Seog Chae
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Publication number: 20190001168Abstract: A safety handle of a fire extinguisher according to the present invention comprises: a lower handle which is coupled to an upper end of a valve and has a first hinge shaft at one end thereof and a first support shaft parallel to the first hinge shaft at a point spaced apart from the first hinge shaft; an upper handle which is coupled to the lower handle to be rotatable around the first hinge shaft, downwardly rotates around the first hinge shaft so as to push an open pin of the fire extinguisher, and is provided with a second support shaft parallel to the first hinge shaft at one point; a safety pin for preventing the upper handle from rotating; a first link having a first end of a length direction coupled to the first support shaft to be rotable around the first support shaft; a second link having a first end of a length direction coupled to the second support shaft to be rotatable around the second support shaft; and a second hinge shaft to which a second end opposite to the first end of the first link andType: ApplicationFiled: May 24, 2016Publication date: January 3, 2019Applicant: TOP ENGINEERING AND CONSTRUCTION CO.,LTD.Inventors: Hojae CHOI, Seungwook HAN, Kooksang SIM, Seongdae CHOI, Seog CHAE
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Patent number: 8163944Abstract: The present invention relates to compositions and methods for achieving the efficient allylic oxidation of organic molecules, especially olefins and steroids, under aqueous conditions. The invention concerns the use of dirhodium (II,II) “paddlewheel complexes, and in particular, dirhodium carboximate and tert-butyl hydroperoxide as catalysts for the reaction. The use of aqueous conditions is particularly advantageous in the allylic oxidation of 7-keto steroids, which could not be effectively oxidized using anhydrous methods, and in extending allylic oxidation to enamides and enol ethers.Type: GrantFiled: October 6, 2008Date of Patent: April 24, 2012Assignee: University of Maryland College ParkInventors: Michael P. Doyle, Arthur J. Catino, Hojae Choi, Jason M. Nichols
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Publication number: 20090093638Abstract: The present invention relates to compositions and methods for achieving the efficient allylic oxidation of organic molecules, especially olefins and steroids, under aqueous conditions. The invention concerns the use of dirhodium (II,II) “paddlewheel complexes, and in particular, dirhodium carboximate and tert-butyl hydroperoxide as catalysts for the reaction. The use of aqueous conditions is particularly advantageous in the allylic oxidation of 7-keto steroids, which could not be effectively oxidized using anhydrous methods, and in extending allylic oxidation to enamides and enol ethers.Type: ApplicationFiled: October 6, 2008Publication date: April 9, 2009Applicant: UNIVERSITY OF MARYLAND, COLLEGE PARKInventors: Michael P. Doyle, Arthur J. Catino, Hojae Choi, Jason M. Nichols