Patents by Inventor Yeon-Jo Hong

Yeon-Jo Hong 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).

  • AN OZONE-RESISTANT POLYURETHANE COMPOSITION AND ASSOCIATED METHOD OF PRODUCTION
    Publication number: 20130303668
    Abstract: The ozone-resistant polyurethane composition according to the present invention, which is for the linings of valves, pipes or ozone contactors used in advanced water-treatment plants, comprises: 100 parts by weight of a polyurethane prepolymer consisting of toluene diisocyanate and poly(tetramethylene ether)glycol; from 8 to 14 parts by weight of 6-methyl-2,4-bis(methylthio)phenylene-1,3-diamine; and from 0.8 to 2.8 parts by weight of benzophenone or benzotriazole. Also, the production method for the ozone-resistant polyurethane composition according to the present invention, which is for the linings of valves, pipes or ozone contactors used in advanced water treatment plants, comprises the steps of: mixing from 0.8 to 2.8 parts by weight of benzophenone or benzotriazole in 100 parts by weight of a polyurethane prepolymer consisting of toluene diisocyanate and poly(tetramethylene ether)glycol, and stirring for between 25 and 35 minutes at between 90 and 100° C.
    Type: Application
    Filed: November 10, 2011
    Publication date: November 14, 2013
    Applicants: HK VALVE CO., LTD, KOREA WATER RESOURCES CORPORATION
    Inventors: Il Joong Yoon, In Jeon, Og Ryang Wi, Cheol-Jong Park, Yeon-Jo Hong