Patents by Inventor Sang Deuk Lee

Sang Deuk Lee 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: 20030077322
    Abstract: A pharmaceutical composition of pranlukast having improved bioavailability is disclosed. The composition is formulated as a solid dispersion, preferably for oral administration. In one embodiment, the invention comprises an amount of pranlukast uniformly dispersed in an inert polymer carrier comprising at least one of hydroxypropylmethylcellulose or hydroxypropylcellulose. In another embodiment, the composition further comprises an amount of hydroxypropylmethylcellulose phthalate-50. A method for preparing the composition, an oral formulation comprising the composition, and methods of treating bronchial asthma and allergic rhinitis with the composition are also disclosed.
    Type: Application
    Filed: November 19, 2002
    Publication date: April 24, 2003
    Inventor: Sang Deuk Lee
  • Patent number: 6508950
    Abstract: The present invention relates to novel refrigerant mixtures as a substitute for chlorodifluoromethane (CHClF2, HCFC-22). More specifically, the invention is directed to refrigerant mixtures that comprise: difluoromethane (CH2F2, HFC-32) as the first component; pentafluoroethane (CHF2CF3, HFC-125) as the second component; 1,1,1,2-tetrafluoroethane (CH2FCF3, HFC-134a) as the third component; any one of cyclopropane (C3H6, RC-270), 1,1-difluoroethane (CH3CHF2, HFC-152a), 1,1,1,2,3,3,3-heptafluoropropane (CF3CHFCF3, HFC-227ea), 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245cb), octafluorocyclobutane (C4F8, RC-318), 1,1,1,2,3,3-hexafluoropropane (CHF2CHFCF3, HFC-236ea), bis(difluoromethyl)ether (CHF2OCHF2, HFE-134), pentafluoroethylmethylether (CF3CF2OCH3, HFE-245), n-pentane (C5H12, R-601) and isopentane ((CH3)2CHCH2CH3, R-601a) as the fourth component.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: January 21, 2003
    Assignee: Korea Institute of Science and Technology
    Inventors: Jong-Sung Lim, Byung-Gwon Lee, Jae-Duck Kim, Sang-Deuk Lee, Hoon-Sik Kim
  • Patent number: 6399536
    Abstract: A catalyst of the formula (1) for the synthesis of alkylene carbonate by reacting alkylene oxide and carbon dioxide LmMXn  (1) wherein L is selected from a group of pyridines; M is a metal atom selected from Zn, Fe, Mn, Pb and In; X is a halogen atom selected from Cl, Br and I; m is 1 or 2, and n is 2 or 3.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: June 4, 2002
    Assignee: Korea Institute of Science and Technology
    Inventors: Hoon Sik Kim, Byung Gwon Lee, Sang Deuk Lee, Young Soo Kwon, Hyun Joo Lee
  • Publication number: 20010019993
    Abstract: A catalyst of the formula (1) for the synthesis of alkylene carbonate by reacting alkylene oxide and carbon dioxide
    Type: Application
    Filed: February 9, 2001
    Publication date: September 6, 2001
    Applicant: Korean Institute of Science and Technology
    Inventors: Hoon Sik Kim, Byung Gwon Lee, Sang Deuk Lee
  • Patent number: 6277324
    Abstract: An apparatus and a method for manufacturing molten pig iron by using a fine iron ore are disclosed. Coal is used to produce a reducing gas, and a fine iron ore is used to produce a molten iron and a reduced iron in a simple and efficient manner. The apparatus for manufacturing a molten iron by directly using coal as the fuel is as follows. A high temperature reducing gas is sent from a melter-gasifier to a fluidized bed lime stone calcining furnace to calcine the lime stone. The reducing gas is supplied to a second fluidized bed reducing furnace so as to manufacture a reduced iron directly. An off-gas from the second fluidized bed reducing furnace is supplied to a first fluidized bed reducing furnace (disposed above the second fluidized bed reducing furnace) to pre-heat and pre-reduce the fine iron ore. The calcined lime stone and the finally reduced iron are supplied to a melter-gasifier to manufacture a molten pig iron.
    Type: Grant
    Filed: August 19, 1999
    Date of Patent: August 21, 2001
    Assignees: Pohang Iron & Steel Co. LTD, Research Institute of Industrial Science & Technology, Voest-Alpine Industrieanlagenbau GmbH
    Inventors: Sang Hoon Joo, Sang Deuk Lee, Myoung Kyun Shin, Jun Hyuk Lee, Min Young Cho, Hang Goo Kim, Heung Won Kang
  • Patent number: 6231780
    Abstract: A refrigerant composition useful as a substitute for chlorodifluoromethane (CHCIF2, HCFC-22). The refrigerant mixture has a first constituent of difluoromethane (CH2F2, HFC-32); a second constituent selected from perfluoropropane (C3F8, PFC-218), cyclopropane (C3H6, RC-270) and butane (C4H10, R-600); and a third constituent selected from 1,1-difluoroethane (CH3CHF2, HFC-152a), 1,1,1,2,2-pentafluoropropane (CH3CF2CF3, HFC-245cb) and bis(difluoromethyl)ether (CHF2OCHF2, HFE-134).
    Type: Grant
    Filed: October 1, 1999
    Date of Patent: May 15, 2001
    Assignee: Korea Institute of Science and Technology
    Inventors: Byung Gwon Lee, Jong Sung Lim, Kun You Park, Byoung Sung Ahn, Sang Deuk Lee
  • Patent number: 6156909
    Abstract: The present invention relates to a method for preparing alkylene carbonate by reacting alkylene oxide with carbon dioxide in the presence of a catalyst system comprising:a) at least one selected from the group consisting of PbY.sub.2, InY.sub.3 and their mixture, wherein Y is Cl, Br or I; andb) at least one alkali metal halide selected from the group consisting of MCl, MBr and MI, wherein M is alkali metal.
    Type: Grant
    Filed: January 5, 2000
    Date of Patent: December 5, 2000
    Assignee: Korea Institute of Science & Technology
    Inventors: Hoon Sik Kim, Jai Jun Kim, Sang Deuk Lee, Kun You Park, Hong Gon Kim
  • Patent number: 6127575
    Abstract: A process is disclosed for preparing N,N'-disubstituted urea by reacting an amine and CO/O.sub.2 mixture gas in the presence of a catalyst system comprising at least one selenium compound selected from SeO.sub.2, (CH.sub.3 O)Se(O)(OH) and (CH.sub.3 CH.sub.2 O)Se(O)(OH), and M.sub.2 CO.sub.3 (M=alkali metal) as a co-catalyst. The process enables less active aromatic amine with a low reactivity as well as an aliphatic amine to be easily transformed into disubstituted urea avoiding the use of expensive precious metal catalysts.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: October 3, 2000
    Assignee: Korea Institute of Science and Technology
    Inventors: Hoon Sik Kim, Yong Jin Kim, Hyun Joo Lee, Moon Jo Chung, Sang Deuk Lee
  • Patent number: 6025387
    Abstract: The present invention relates to novel flavone/flavanone compounds or their pharmaceutically acceptable salts and process for preparation thereof for protecting gastrointestinal tracts against gastritis, ulcers and inflammatory bowel disease.
    Type: Grant
    Filed: January 14, 1999
    Date of Patent: February 15, 2000
    Assignee: Dong a Pharmaceutical Co., Ltd.
    Inventors: Moohi Yoo, Mi Won Son, Ik Yon Kim, Won Bae Kim, Soon Hoe Kim, Sang Deuk Lee, Geun Jho Lim, Joong In Lim, Byoung Ok Ahn, Nam Gi Baik, Dong Sung Kim, Tae Young Oh, Byung Kwon Ryu, Jae Sung Yang, Hee Chan Shin
  • Patent number: 5962721
    Abstract: A method of preparing carbamates by reacting amine with alcohol and mixed gas of CO/O.sub.2 in the presence of one or more catalyst selected from the group consisting of monovalent copper halide having the structural formula of Cu?NCMe.sub.4 !X, K?CuX.sub.2 !, ?CuX(S)! (wherein X=Cl, Br, or I; S=solvent) or monovalent copper compound having carbonyl group having the structural formula of ?Cu(CO)X.sub.a L.sub.b !.sub.m Y.sub.n (wherein, X=CF.sub.3 CO.sub.2, Cl, HB(pz).sub.3 (wherein, pz=pyrazoyl,C.sub.3 H.sub.3 N.sub.2), LBF.sub.2, {LBF.sub.2 =difluoro-3,3'-(trimethylenedinitrilo)bis(2-butanone oximato)borate}; L=en, diene; Y=BPh.sub.4, AsF.sub.6 ; a,b=0,1; m=1-4; n=0,1).
    Type: Grant
    Filed: April 29, 1998
    Date of Patent: October 5, 1999
    Assignee: Korea Institute of Science and Technology
    Inventors: Hoon Sik Kim, Sang Deuk Lee, Hyun-joo Lee, In-Seok Seo, Yong Jin Kim
  • Patent number: 5723700
    Abstract: There is a method for concurrently producing 1,1,1,2-tetrafluoroethane and pentafluoroethane, which comprises (A) reacting 1,1,1-trifluoro-2-chloroethane, hydrogen fluoride and chlorine in a first reactor in the presence of flurorination catalyst at a temperature in the range of from 300.degree. C. to 450.degree. C.; (B) transfering the products of step (A) together with trichloroethylene to a second reactor and reacting them at a temperature in the range of from 200.degree. C. to 400.degree. C.; (C) separating 1,1,1,2-tetrafluoroethane and pentafluoroethane from the resultant products; and (D) feeding the remaining products from step (C) back to the first reactor, wherein the molar ratio of chlorine/1,1,1-trifluoro-2-chloroethanethe in step (A) is in the range of from 0.001 to 0.
    Type: Grant
    Filed: September 5, 1996
    Date of Patent: March 3, 1998
    Assignee: Korea Institute of Science and Technology
    Inventors: Byung Gwon Lee, Hoon Sik Kim, Honggon Kim, Sang Deuk Lee, Moon Jo Chung
  • Patent number: 5723702
    Abstract: There is a process for removing moisture from chlorodifluoromethane (CHClF.sub.2) containing moisture in excess in the preparation of chlorodifluoromethane comprising lowering the partial pressure of water in the chlorodifluoromethane gas by contacting the chlorodifluoromethane gas with an aqueous solution of calcium chloride of more than 5% by weight.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: March 3, 1998
    Assignee: Korea Institute of Science and Technology
    Inventors: Young Soo Kwon, Kun You Park, Sang-Deuk Lee, Honggon Kim