Patents by Inventor Du Hee Han

Du Hee Han 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).

  • Cleaning agent for high viscosity metalworking fluid
    Patent number: 8216987
    Abstract: The present invention relates to a agent for cleaning metal drawing oil, which contains alcohol, glycol ether, water, and one or more compounds selected from hydrocarbon or ester compounds. The cleaning agent according to the present invention is environmentally friendly because it does not contain halogen elements such as chlorine. The agent can reduce toxicity on the human body due to low volatility; is economical due to the long change period resulting from the reduction of evaporation; and removes drawing oil having high viscosity and polarity effectively during metal processing.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: July 10, 2012
    Assignee: Woorifinechem. Co. Ltd
    Inventors: Du Hee Han, Tae Gi Kim
  • CLEANING AGENT FOR HIGH VISCOSITY METALWORKING FLUID
    Publication number: 20110237483
    Abstract: The present invention relates to a agent for cleaning metal drawing oil, which contains alcohol, glycol ether, water, and one or more compounds selected from hydrocarbon or ester compounds. The cleaning agent according to the present invention is environmentally friendly because it does not contain halogen elements such as chlorine. The agent can reduce toxicity on the human body due to low volatility; is economical due to the long change period resulting from the reduction of evaporation; and removes drawing oil having high viscosity and polarity effectively during metal processing.
    Type: Application
    Filed: November 30, 2009
    Publication date: September 29, 2011
    Applicant: WOORIFINECHEM. CO. LTD
    Inventors: Du Hee Han, Tae Gi Kim