Patents by Inventor Yoshio Usuda

Yoshio Usuda 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).

  • Laser-broken fuse
    Patent number: 5321300
    Abstract: In a laser-broken fuse used in a memory redundancy technique, an aluminum wiring layer is formed on an interlevel insulating film. A portion of the wiring layer is selected to be broken to shut off conduction of the layer. A polysilicon-made heat member is provided in the interlevel insulating film at the place which is underneath the selected portion. The heat member is located on a field insulating film. This heat member generates heat by absorbing energy from a laser beam, and thermal-explodes in a sealed atmosphere so as to break the selected portion.
    Type: Grant
    Filed: April 8, 1992
    Date of Patent: June 14, 1994
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshio Usuda, Hiroaki Itaba, Jumpei Kumagai, Seiji Kaki