Patents by Inventor Kiyotaka Yonekawa

Kiyotaka Yonekawa 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).

  • Patent number: 9437734
    Abstract: A semiconductor device includes a semiconductor substrate having a drain region, a source region and an impurity diffusion region; an oxide film formed on the impurity diffusion region; a first protective film including a SiN film as a principal component and being formed on the oxide film; and a second protective film containing carbon and being formed on the first protective film. A method of manufacturing the semiconductor device, includes doping an impurity into a semiconductor substrate, thereby forming a drain region, a source region and an impurity diffusion region; forming an oxide film on the impurity diffusion region; forming a first protective film including a SiN film as a principal component on the oxide film; and forming a second protective film containing carbon on the first protective film.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: September 6, 2016
    Assignee: LAPIS SEMICONDUCTOR CO., LTD.
    Inventor: Kiyotaka Yonekawa
  • Publication number: 20120037963
    Abstract: A semiconductor device includes a semiconductor substrate having a drain region, a source region and an impurity diffusion region; an oxide film formed on the impurity diffusion region; a first protective film including a SiN film as a principle component and being formed on the oxide film; and a second protective film containing carbon and being formed on the first protective film. A method of manufacturing the semiconductor device, includes doping an impurity into a semiconductor substrate, thereby forming a drain region, a source region and an impurity diffusion region; forming an oxide film on the impurity diffusion region; forming a first protective film including a SiN film as a principle component on the oxide film; and forming a second protective film containing carbon on the first protective film.
    Type: Application
    Filed: August 3, 2011
    Publication date: February 16, 2012
    Applicant: OKI SEMICONDUCTOR CO., LTD.
    Inventor: Kiyotaka YONEKAWA
  • Patent number: 7855436
    Abstract: A semiconductor wafer includes an insulation substrate with transparency; a silicon semiconductor layer formed on the insulation substrate; a chip forming area defined on the silicon semiconductor layer; a scribe line area defined on the silicon semiconductor layer for dividing the chip forming area; and an opaque pattern layer formed in the scribe line area. A plurality of opaque pattern portions is arranged apart from each other in the opaque pattern layer.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: December 21, 2010
    Assignee: OKI Semiconductor Co., Ltd
    Inventor: Kiyotaka Yonekawa
  • Publication number: 20090001521
    Abstract: A semiconductor wafer includes an insulation substrate with transparency; a silicon semiconductor layer formed on the insulation substrate; a chip forming area defined on the silicon semiconductor layer; a scribe line area defined on the silicon semiconductor layer for dividing the chip forming area; and an opaque pattern layer formed in the scribe line area. A plurality of opaque pattern portions is arranged apart from each other in the opaque pattern layer.
    Type: Application
    Filed: May 14, 2008
    Publication date: January 1, 2009
    Inventor: Kiyotaka Yonekawa