Patents by Inventor Akio Andoo

Akio Andoo 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 manufacturing semiconductor device with controlled carrier lifetime
    Patent number: 5196354
    Abstract: A semiconductor device has a semiconductor substrate, an insulated gate field-effect transistor section formed in the substrate and a peripheral section formed in the substrate and arranged to substantially surround the field-effect transistor section. A passivation layer of an organic material is provided over that part of the substrate in which the field-effect transistor section is not located. The device may be resin mold packaged for an enhanced humidity-resistance by making use of the fact tht the peripheral portion of the device is covered with organic resin.
    Type: Grant
    Filed: September 14, 1990
    Date of Patent: March 23, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Shigeo Ohtaka, Akio Andoo, Tetsuo Iijima