Patents by Inventor Masaaki Sakaki

Masaaki Sakaki 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 laser marking
    Patent number: 4861620
    Abstract: A pigment layer is provided on a surface of an article on which a marking is to be formed and is irradiated with patterned laser light to change internal molecular structure of pigment to thereby change its color. The marking can be multicolored by a suitable selection of pigment and laser energy density.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: August 29, 1989
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kenkoku Azuma, Masaaki Sakaki