Patents by Inventor Si Youl Choun

Si Youl Choun 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).

  • Coating composition for steel sheets having zinc and zinc alloy coating layer, method for forming coating layer using the coating composition and steel sheet having the coating layer formed thereof
    Patent number: 8216694
    Abstract: A coating composition for zinc- and zinc alloy-coated steel sheets includes: 1 to 30% by weight of hypophosphorous acid, 0.1 to 10% by weight of manganese, 0.01 to 5% by weight of a polyvinyl compound, zinc oxide and the balance of water, and further comprises 20% by weight or less of alcohol, when necessary, wherein the zinc oxide is included in such a content that, when 50 Ml (milliliters) of the coating composition is neutralized and titrated with 0.1N NaOH, the NaOH used for the neutralization titration is present in an amount of 10.0 Ml (milliliters) or less, and a content of free acid in the coating composition is adjusted to such an amount that, when 50 Ml (milliliters) of the coating composition is neutralized and titrated with 0.1N NaOH, the NaOH used for the neutralization titration is present in an amount of 10.0 Ml (milliliters) or less.
    Type: Grant
    Filed: July 29, 2008
    Date of Patent: July 10, 2012
    Assignee: Posco
    Inventors: Young Geun Kim, Ha Sun Park, Sang Min Lee, Si Youl Choun, Yong Woon Kim, Jae Ryung Lee
  • COATING COMPOSITION FOR STEEL SHEETS HAVING ZINC AND ZINC ALLOY COATING LAYER, METHOD FOR FORMING COATING LAYER USING THE COATING COMPOSITION AND STEEL SHEET HAVING THE COATING LAYER FORMED THEREOF
    Publication number: 20110165434
    Abstract: A coating composition for zinc- and zinc alloy-coated steel sheets includes: 1 to 30% by weight of hypophosphorous acid, 0.1 to 10% by weight of manganese, 0.01 to 5% by weight of a polyvinyl compound, zinc oxide and the balance of water, and further comprises 20% by weight or less of alcohol, when necessary, wherein the zinc oxide is included in such a content that, when 50 Ml (milliliters) of the coating composition is neutralized and titrated with 0.1N NaOH, the NaOH used for the neutralization titration is present in an amount of 10.0 Ml (milliliters) or less, and a content of free acid in the coating composition is adjusted to such an amount that, when 50 Ml (milliliters) of the coating composition is neutralized and titrated with 0.1N NaOH, the NaOH used for the neutralization titration is present in an amount of 10.0 Ml (milliliters) or less.
    Type: Application
    Filed: July 29, 2008
    Publication date: July 7, 2011
    Applicant: POSCO
    Inventors: Young Geun Kim, Ha Sun Park, Sang Min Lee, Si Youl Choun, Yong Woon Kim, Jae Ryung Lee