Patents by Inventor Kju H. Shin

Kju H. Shin 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).

  • Process of preparing substituted anilines
    Patent number: 5117061
    Abstract: Novel anilines of the 2,6-dialkyl-4-dialkylaminomethylaniline type are prepared by reacting a secondary amine and an aldehyde with a primary aniline reactant having a free para position and substituents in both ortho positions in the presence of an acid catalyst, the amounts of amine and acid employed being at least equimolar with respect to the amount of aldehyde, and the reaction being conducted by adding the primary aniline reactant to a preformed mixture of the secondary amine, aldehyde, and acid.
    Type: Grant
    Filed: May 12, 1986
    Date of Patent: May 26, 1992
    Assignee: Ethyl Corporation
    Inventor: Kju H. Shin
  • Alkenyl succinic anhydrides process
    Patent number: 5021169
    Abstract: Alkenyl succinic anhydrides having a decreased amount of tar and color bodies are made by the reaction of an olefin with maleic anhydride in the presence of a tri-orthoalkylphenyl phosphite and optionally a hindered phenolic antioxidant such as 2,4,6-tri-(3,5-di-tert-butyl-4-hydroxybenzyl) mesitylene.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: June 4, 1991
    Assignee: Ethyl Corporation
    Inventors: Kju H. Shin, Paul S. Hale
  • Alkenyl succinic anhydrides process
    Patent number: 4958034
    Abstract: Alkenyl succinic anhydrides having a decreased amount of tar and color bodies are made by the reaction of an olefin with maleic anhydride in the presence of an arylfluorophosphite (e.g. 2,2'-ethylidenebis(4,6-di-tert-butylphenyl) fluorophosphite) and optionally a hindered phenolic antioxidant such as 2,4,6-tri(3,5-di-tert-butyl-4-hydroxybenzyl) mesitylene.
    Type: Grant
    Filed: November 13, 1989
    Date of Patent: September 18, 1990
    Assignee: Ethyl Corporation
    Inventors: Paul S. Hale, Kju H. Shin
  • Preparation of diphenolics
    Patent number: 4692555
    Abstract: A process for the production of diphenolic compounds having a divalent bridge. A first disubstituted phenol is reacted with an aldehyde in the presence of a secondary amine and excess alcohol to form an ether intermediate. The ether intermediate is reacted with a phenol having an open ortho or para position to form a diphenolic.
    Type: Grant
    Filed: April 9, 1984
    Date of Patent: September 8, 1987
    Assignee: Ethyl Corporation
    Inventor: Kju H. Shin
  • Process for preparing arylisothiocyanates
    Patent number: 4636574
    Abstract: Arylisothiocyanates are prepared by reacting a primary arylamine with carbon disulfide in the presence of a tertiary amine.
    Type: Grant
    Filed: November 4, 1985
    Date of Patent: January 13, 1987
    Assignee: Ethyl Corporation
    Inventor: Kju H. Shin
  • Unsymmetrical alkylated diphenolic compounds
    Patent number: 4609767
    Abstract: 4-[[4-hydroxy-3-(1-methylpropyl)-5-lower alkylphenyl]-carbon bridge]-2,6-di-lower alkylphenols.The compounds of the invention such as 4-[[4-hydroxy-3,5-bis(1-methylpropyl)phenyl]methyl]-2,6-dimethylphenol have very low melting points, some being liquid at room temperature, and other physical and chemical properties making them valuable as curing agents and antioxidants and for preparing epoxy resins and other chemicals.
    Type: Grant
    Filed: September 12, 1985
    Date of Patent: September 2, 1986
    Assignee: Ethyl Corporation
    Inventors: Kju H. Shin, Edward F. Tatum
  • Process for preparing substituted tetralones
    Patent number: 4603221
    Abstract: 6-Alkoxytetralones are prepared by gradually adding a persulfate to a heated mixture of a 6-alkoxytetralin, a salt of a divalent metal, and a tertiary amine and maintaining the 6-alkoxytetralin in intimate admixture with the persulfate until it has been oxidized to the corresponding 6-alkoxytetralone. The reaction is preferably conducted in solution or dispersion. Preferred reaction ingredients are 6-methoxytetralin, cupric sulfate, an alkylpyridine, and sodium persulfate.
    Type: Grant
    Filed: June 10, 1985
    Date of Patent: July 29, 1986
    Assignee: Ethyl Corporation
    Inventor: Kju H. Shin
  • Method of preparing adenine
    Patent number: 4511716
    Abstract: In the preparation of adenine from hydrogen cyanide, formamide, an ammonium salt, and methyldisulfide, the formation of a polymer by-product is reduced by heating a reaction mixture comprising the formamide and ammonium salt in a closed vessel to a reaction temperature of about 50.degree.-180.degree. C., adding the hydrogen cyanide to the preheated mixture over a period of about 1-5 hours, and maintaining the reaction temperature until the reaction is complete.
    Type: Grant
    Filed: February 4, 1983
    Date of Patent: April 16, 1985
    Assignee: Ethyl Corporation
    Inventor: Kju H. Shin
  • Adenine preparation
    Patent number: 4401814
    Abstract: Adenine is prepared by reacting a dinitrile of diaminomaleic acid with N-methyldichloroformidinium chloride and ammonia at elevated temperature in the presence of formamide and an ammonium salt of a lower alkanoic acid.
    Type: Grant
    Filed: December 16, 1981
    Date of Patent: August 30, 1983
    Assignee: Ethyl Corporation
    Inventor: Kju H. Shin
  • Adenine production
    Patent number: 4391977
    Abstract: Adenine is produced by reacting hydrogen cyanide with formamide in the presence of an ammonium salt and a catalytic amount of methyldisulfide at elevated temperature and pressure.
    Type: Grant
    Filed: December 16, 1981
    Date of Patent: July 5, 1983
    Assignee: Ethyl Corporation
    Inventor: Kju H. Shin
  • Chemical process for preparing methylene bis-anilines
    Patent number: 4289906
    Abstract: Aromatic amine hydrochloride having an unsubstituted ortho or para position reacts with dimethylsulfoxide forming methylenebis aromatic amine.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: September 15, 1981
    Assignee: Ethyl Corporation
    Inventor: Kju H. Shin
  • Preparation of acetals
    Patent number: 4209643
    Abstract: A process is described for the production of predominately linear and alpha-branched acetals by reacting a C.sub.3 or higher alpha or internal olefin, carbon monoxide, hydrogen, and a C.sub.1 -C.sub.5 alkanol using a cobalt catalyst in the presence of a promoter which is a quaternary ammonium salt such as N-benzyl,N,N,N-trimethylammonium methoxide. When a quaternary ammonium salt is used, an increase in the rate of reaction is effected.
    Type: Grant
    Filed: December 11, 1978
    Date of Patent: June 24, 1980
    Assignee: Ethyl Corporation
    Inventor: Kju H. Shin