Patents by Inventor Michinori Yokozawa

Michinori Yokozawa 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 method and an apparatus thereof
    Patent number: 5104454
    Abstract: The cleaning method of the present invention comprises; (a) immersing a material to be cleaned in a mixed solvent contained in the first open vessel, wherein the mixed solvent consists of a chlorofluoro-hydrocarbon with a boiling point of 20.degree.-50.degree. C. and an organic solvent with a boiling point of 50.degree. C. or more higher than that of said chlorofluoro-hydrocarbon and compatible therewith, but not azeotropic therewith, and kept at a temperature within a range between the boiling point of the chlorofluoro-hydrocarbon and a temperature of at least 30.degree. C.
    Type: Grant
    Filed: March 15, 1988
    Date of Patent: April 14, 1992
    Assignee: Du Pont - Mitsui Fluorochemicals Co. Ltd.
    Inventors: Michinori Yokozawa, Hideaki Kikuchi