Patents by Inventor Chul Jin Choi

Chul Jin 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: 20080141554
    Abstract: The present invention relates to a laundry machine. The laundry machine includes a drum rotatably mounted in a cabinet, a hot air heater to heat air and supply hot air into the drum, a steam generator to supply steam into the drum, a water supply source detachably mounted in the cabinet to supply water into the steam generator, and a water leakage preventing unit to prevent water leakage when the water supply source is detachably mounted.
    Type: Application
    Filed: October 31, 2007
    Publication date: June 19, 2008
    Applicant: LG Electronics Inc.
    Inventors: Sang Hun Bae, Chang Woo Son, Chul Jin Choi, Dong Hyun Kim, Young Bok Son, Heung Jae Kim
  • Publication number: 20080141558
    Abstract: A steam laundry dryer is disclosed. The steam laundry dryer includes a drum rotatably mounted in a cabinet, a hot air heater to heat air to supply hot air into the drum, a steam generator to supply steam into the drum, a water supply source to supply water into the steam generator, and a container drawably mounted in a portion of the cabinet. The water supply source is detachably mounted in the container.
    Type: Application
    Filed: November 1, 2007
    Publication date: June 19, 2008
    Applicant: LG ELECTRONICS INC.
    Inventors: Sang Hun Bae, Chang Woo Son, Chul Jin Choi, Dong Hyun Kim, Young Bok Son, Heung Jae Kim
  • Publication number: 20080141552
    Abstract: A steam dryer is disclosed, by which creases left on clothes and the like can be prevented or removed, by which water can be easily and conveniently supplied to a cartridge to facilitate the cartridge to be cleaned, and by which water can be easily and conveniently supplied to a cartridge to facilitate a filter of the cartridge to be replaced. The present invention includes a drum to be selectively rotatable, a hot-air heater to heat air to supply hot air to the drum, a steam generator to supply stem to the drum, and a water container to store water to be supplied to the steam generator, the water container having a supply hole on a upper portion.
    Type: Application
    Filed: October 31, 2007
    Publication date: June 19, 2008
    Applicant: LG ELECTRONICS INC.
    Inventors: Sang Hun Bae, Chang Woo Son, Chul Jin Choi, Dong Hyun Kim, Young Bok Son, Heung Jae Kim
  • Publication number: 20080115381
    Abstract: The present invention relates to a laundry dryer that can prevent as well as remove wrinkles of laundry. A laundry dryer includes a drum in which laundry is held; a hot air heater that heats air to supply hot air to the drum; a steam generator that generates steam to supply the steam to the drum; and a water tank to hold water to supply to the steam generator, the water tank in flow communication with a water supply hole through which water is supplied into the water tank with the water tank kept in flow communication with the steam generator.
    Type: Application
    Filed: September 18, 2007
    Publication date: May 22, 2008
    Applicant: LG Electronics Inc.
    Inventors: Sang Hun Bae, Chul Jin Choi, Dong Hyun Kim, Young Bok Son
  • Patent number: 7118724
    Abstract: Nanophase WC powder is produced by preparing a precursor including tungsten; producing gas by vaporizing or sublimating the precursor; carbonizing the gas in the atmosphere without oxygen while maintaining pressure below atmospheric pressure; and condensing the carbonized gas
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: October 10, 2006
    Assignee: Korea Institute of Machinery and Materials
    Inventors: Byung Kee Kim, Jin Chun Kim, Gook Hyun Ha, Chul Jin Choi
  • Publication number: 20050150329
    Abstract: The present invention provides a method for producing nano-sized Fe powder having a polymer coated layer on a surface thereof, so as to prevent the nano-sized Fe powder from being oxidized under atmosphere. The method includes: gasifying an iron pentacarbonyl (Fe(CO)5) or an iron acetate ((CH3CO2)2Fe) precursor in a ceramic bubbler; forming nano-sized Fe particles due to the crystallization of Fe gas while mixing the gasified precursor with Ar gas in a reactor; and precipitating the nano-sized Fe particles in a polymer solution in a chamber, before the nano-sized Fe particles are oxidized. According to this technique, Fe powder on the order of tens of nms in size, and having a polymer coated layer, are obtained from the Fe precursor. A system for producing the nano-sized Fe powder is also disclosed.
    Type: Application
    Filed: November 3, 2004
    Publication date: July 14, 2005
    Inventors: Byung Kim, Dong Lee, Chul-Jin Choi
  • Publication number: 20040219091
    Abstract: Nanophase WC powder is produced by preparing a precursor including tungsten; producing gas by vaporizing or sublimating the precursor; carbonizing the gas in the atmosphere without oxygen while maintaining pressure below atmospheric pressure; and condensing the carbonized gas
    Type: Application
    Filed: December 30, 2003
    Publication date: November 4, 2004
    Inventors: Byung Kee Kim, Jin Chun Kim, Gook Hyun Ha, Chul Jin Choi
  • Patent number: 6676730
    Abstract: The present invention relates to a method of producing Nd—Fe—B based nanophase powder, or more particularly, to a method of producing Nd2Fe14B phase powder of 1 &mgr;m or less, having Nd2Fe14B crystal grains of 50 nm or less, which comprises the following steps of: producing a precursor powder having a mixture of elements of Nd, Fe and B by means of spray-drying a mixed aqueous solution comprising Nd metal salt, Fe metal salt, and boric acid; producing an oxide composite powder by means of desaltation of said powder; reducing the composite oxide powder, and ball-milling of said composite powder comprising Nd oxides and &agr;-Fe; producing a mixed powder of Nd2Fe14B/CaO phase by mixing Ca to said composite powder after milling; and removing CaO by washing said composite powder with water, followed by drying.
    Type: Grant
    Filed: May 23, 2001
    Date of Patent: January 13, 2004
    Assignee: Korea Institute of Machinery and Materials
    Inventors: Byung Kee Kim, Chul Jin Choi, Xing Long Dong
  • Publication number: 20020005088
    Abstract: The present invention relates to a method of producing Nd—Fe—B based nanophase powder, or more particularly, to a method of producing Nd2Fe14B phase powder of 1 &mgr;m or less, having Nd2Fe14B crystal grains of 50 nm or less, which comprises the following steps of: producing a precursor powder having a mixture of elements of Nd, Fe and B by means of spray-drying a mixed aqueous solution comprising Nd metal salt, Fe metal salt, and boric acid; producing an oxide composite powder by means of desaltation of said powder; reducing the composite oxide powder, and ball-milling of said composite powder comprising Nd oxides and &agr;-Fe; producing a mixed powder of Nd2Fe14B/CaO phase by mixing Ca to said composite powder after milling; and removing CaO by washing said composite powder with water, followed by drying.
    Type: Application
    Filed: May 23, 2001
    Publication date: January 17, 2002
    Applicant: Korea Institute of Machinery and Materials
    Inventors: Byung Kee Kim, Chul Jin Choi, Xing Long Dong
  • Patent number: 6126896
    Abstract: A method of making TiC based cermets through a reaction milling process is disclosed. In the method of this invention, a particle mixture, consisting of 50-95 wt. % Ti-C particles, with Ti particles being mixed with C particles at a weight ratio of 4:1, and 5-50 wt. % Ni particles, is reaction-milled in a Spex mill, thus making TiC based particles. A preform is formed of the TiC based particles and is sintered, thus making a TiC based cermet. The Ni particles of the particle mixture may be substituted with Ni-Mo particles. In addition, the method may further comprise the steps of presintering the preform from the forming step, and intermediate-machining the presintered preform prior to finally sintering the preform, thus machining the preform more precisely. The sintering temperature preferably ranges from 1,300.degree. C. to 1,400.degree. C. In the method of this invention, the TiC particles are made through the reaction milling process, thus reducing the production cost while making the TiC based cermets.
    Type: Grant
    Filed: May 28, 1999
    Date of Patent: October 3, 2000
    Assignee: Korea Institute of Machinery & Materials
    Inventor: Chul Jin Choi