Patents Assigned to Hakuyosha Co., Ltd.
  • Method for washing oily soil from objects
    Patent number: 5885366
    Abstract: A washing method for removing oily soil from an object stained therewith by contacting the object with a non-flammable washing agent composition comprising 0.001 to 30 parts of a fluorine-free absorbent which can absorb and capture oily soil and not less than 70 parts of perfluorocarbon liquid to remove the soil from the object.
    Type: Grant
    Filed: August 12, 1996
    Date of Patent: March 23, 1999
    Assignees: Hakuyosha Co., Ltd., Nippon Shokubai Co., Ltd.
    Inventor: Makoto Umino