Patents by Inventor Woo Suk CHEI

Woo Suk CHEI 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).

  • Patent number: 9012591
    Abstract: A copolymerized polycarbonate resin includes a repeat unit represented by Formula 1; a repeat unit represented by Formula 2; and a repeat unit represented by Formula 3, wherein the repeat unit represented by Formula 1 is different than the repeat unit represented by Formula 3, and wherein Formula 1, 2, and 3 are the same as defined in the specification. The copolymerized polycarbonate resin can have excellent properties in terms of chemical resistance, thermal resistance, and/or external appearance.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: April 21, 2015
    Assignee: Cheil Industries Inc.
    Inventors: Jun Ho Chi, Jong Chan Hur, O Sung Kwon, Woo Suk Chei
  • Publication number: 20150093531
    Abstract: A container for precision members is prepared from a polycarbonate resin, wherein a polycarbonate resin solution prepared by immersing the polycarbonate resin in water and leaving the solution has chloride ions (Cl?), fluoride ions (F?) and sulfate ions (SO42-) in a concentration of about 2 ppb or less, independently of each other, as detected by ion chromatography (IC). The container for precision members is capable of preserving and transporting the precision members predisposed to damage by minor amounts of impurities or contaminants without damage.
    Type: Application
    Filed: September 29, 2014
    Publication date: April 2, 2015
    Inventors: Jong Chan HUR, Jun Ho CHI, Woo Suk CHEI, Eun Byul LEE
  • Publication number: 20140187738
    Abstract: A copolymerized polycarbonate resin includes a repeat unit represented by Formula 1; a repeat unit represented by Formula 2; and a repeat unit represented by Formula 3, wherein the repeat unit represented by Formula 1 is different than the repeat unit represented by Formula 3, and wherein Formula 1, 2, and 3 are the same as defined in the specification. The copolymerized polycarbonate resin can have excellent properties in terms of chemical resistance, thermal resistance, and/or external appearance.
    Type: Application
    Filed: December 17, 2013
    Publication date: July 3, 2014
    Applicant: Cheil Industries Inc.
    Inventors: Jun Ho CHI, Jong Chan HUR, O. Sung KWON, Woo Suk CHEI
  • Publication number: 20140186602
    Abstract: A polycarbonate resin includes a repeat unit represented by Formula 1; a repeat unit represented by Formula 2; and a repeat unit represented by Formula 3, wherein the polycarbonate resin has a weight average molecular weight of about 15,000 g/mol to about 60,000 g/mol and a melt index of about 3 g/10 min to about 40 g/10 min.: wherein R1, R2, R3, R4, a, b, c, and d are the same as defined in the specification. The polycarbonate resin for film can exhibit excellent scratch resistance, elongation, chemical resistance and heat resistance, and can be used to prepare a film in roll form without any protective film.
    Type: Application
    Filed: September 13, 2013
    Publication date: July 3, 2014
    Applicant: Cheil Industries Inc.
    Inventors: Jun Ho CHI, O Sung KWON, Jong Chan HUR, Hyuck Man KWON, Dong Geun LEE, Woo Suk CHEI, Bok Nam JANG
  • Publication number: 20140171583
    Abstract: The polycarbonate resin composition includes: a polycarbonate component, which includes an aromatic polycarbonate resin and a copolymerized polycarbonate resin including a repeat unit represented by Formula 1 and a repeat unit represented by Formula 2; and a flame retardant, and has a scratch width of about 310 ?m or less as measured by Ball-type Scratch Profile (BSP) test; a pencil hardness rating of F or higher; a flame retardancy level of V-0 or higher as measured on a 2.0 mm thick specimen according to UL94; and a transmittance of about 80% or more as measured in accordance with ASTM D1003. The polycarbonate resin composition can exhibit excellent properties in terms of scratch resistance, flame retardancy and transparency. wherein R1 and R2 are the same or different and are each independently substituted or unsubstituted C1 to C6 alkyl, and a and b are the same or different and are each independently an integer from 1 to 4.
    Type: Application
    Filed: October 3, 2013
    Publication date: June 19, 2014
    Applicant: Cheil Industries Inc.
    Inventors: Jong Chan HUR, Jun Ho CHI, Dong Geun LEE, Woo Suk CHEI