Patents by Inventor Yashuhisa Hagiwara

Yashuhisa Hagiwara 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).

  • Lead frame and semiconductor device using the same
    Patent number: 4951120
    Abstract: A lead frame according this invention is structured such that the width or the length of the inner leads disposed adjacent to the tab suspending leads is made greater than that of other inner leads, whereby wires can be supported completely upon bonding to the leads and, accordingly, the bonding can be carried out surely and the occurrence of short-circuit of the wires can be prevented. Semiconductor devices of high electric reliability can be provided as a result these technics.
    Type: Grant
    Filed: December 13, 1988
    Date of Patent: August 21, 1990
    Assignees: Hitachi, Ltd., Hitachi Microcomputer Engineering Ltd.
    Inventors: Yashuhisa Hagiwara, Masachika Masuda