Patents by Inventor Takeski Yamamoto

Takeski Yamamoto 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).

  • Mesa type semiconductor device with guard ring
    Patent number: 4450469
    Abstract: The present invention is directed to a mesa type semiconductor device, formed in a body of semiconductor material, containing at least one guard ring region. The at least one guard ring region is formed to a relatively shallow depth within the body thereby reducing the height of the mesa above the main portion of the body of semiconductor material. The resultant device is physically stronger than prior art devices.
    Type: Grant
    Filed: January 26, 1981
    Date of Patent: May 22, 1984
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Takeski Yamamoto