Patents by Inventor Yoshitsugu Imazawa

Yoshitsugu Imazawa 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 of preparation of a surface-coated metal-made ornamental article
    Patent number: 5091224
    Abstract: A metal-made ornamental article, such as watch cases and the like, is provided with a bilayered coating layer composed of an undercoating layer of a specified thickness formed from an aqueous colloidal solution of sodium silicate and silica sol in a specified proportion and a top-coating layer of a specified thickness formed by coating with a solution of a partial hydrolysis-condensation product of an organic silicate ester compound, such as ethyl silicate, followed by baking to effect curing of the coating layer.
    Type: Grant
    Filed: October 19, 1989
    Date of Patent: February 25, 1992
    Assignee: Citizen Watch Co., Ltd.
    Inventors: Hachiro Kushida, Kazumi Hamano, Yoshitsugu Imazawa, Kenji Irie