Patents by Inventor Kazumasu Motokawa

Kazumasu Motokawa 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 forming isolation region in integrated circuit semiconductor device
    Patent number: 5004701
    Abstract: A method of manufacturing an isolation region including a field oxide layer and a channel stopper impurity region is disclosed. The channel stopper impurity region is formed after forming the field oxide layer by introducing ions of impurity at a portion of the substrate through the field oxide layer by ion-implantation manner.
    Type: Grant
    Filed: January 27, 1989
    Date of Patent: April 2, 1991
    Assignee: NEC Corporation
    Inventor: Kazumasu Motokawa