Patents by Inventor Megumi Hamano

Megumi Hamano 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).

  • Method for cleaning solid surface with a mixture of pure water and calcium carbonate particles
    Patent number: 5226969
    Abstract: A method for cleaning a solid surface which is effective for a substance to be cleaned having a complicated structure and which uses no solvent such as CFC or the like which is harmful to the environment of the earth. A cleaning liquid is obtained by mixing insoluble particles in a liquid and brought into an eddy-flow state so that a surface to be cleaned can be uniformly cleaned.
    Type: Grant
    Filed: March 7, 1991
    Date of Patent: July 13, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Watanabe, Mitsuyoshi Otake, Megumi Hamano, Yoshiharu Takizawa
  • Cleaning apparatus for substrate
    Patent number: 5203798
    Abstract: A cleaning apparatus capable of substantially complete removal of contaminations generated during the manufacturing process of glass substrates, semiconductor wafers, magnetic disk substrates, magnetic head substrates or the like. The cleaning apparatus comprises a cleaning bath which is greater in cross section than the material to be cleaned and which has an opening portion for insertion of the material to be cleaned, and an ultrasonic transducer attached to the cleaning bath. The apparatus precludes various defects arising from contaminations, and enhances reliability and yield of the substrates manufactured.
    Type: Grant
    Filed: June 24, 1991
    Date of Patent: April 20, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Masahiro Watanabe, Mitsuyoshi Otake, Megumi Hamano