Patents by Inventor Hiromasa Hoko

Hiromasa Hoko 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: 7727843
    Abstract: The invention relates to a semiconductor element used for a nonvolatile semiconductor storage device or the like, a semiconductor storage device using the same, a data writing method thereof, a data reading method thereof and a manufacturing method of those, and has an object to provide a semiconductor element in which scaling and integration of cells are possible, storage characteristics of data are excellent, and reduction in power consumption is possible, a semiconductor storage device using the same, a data writing method thereof, a data reading method thereof, and a manufacturing method of those.
    Type: Grant
    Filed: January 9, 2007
    Date of Patent: June 1, 2010
    Assignee: Fujitsu Microelectronics Limited
    Inventors: Hiroshi Ishihara, Kenji Maruyama, Tetsuro Tamura, Hiromasa Hoko
  • Patent number: 7465980
    Abstract: A ferroelectric memory device includes a gate electrode formed on a semiconductor body via a ferroelectric film, first and second diffusion regions being formed in the semiconductor body at respective sides of a channel region, wherein the ferroelectric film comprises a first region located in the vicinity of the first diffusion region, a second region located in the vicinity of the second diffusion region, and a third region located between the first and second regions, wherein the first, second and third regions carry respective, mutually independent polarizations.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: December 16, 2008
    Assignees: Fujitsu Limited, Tokyo Institute of Technology
    Inventors: Yoshihiro Arimoto, Hiroshi Ishihara, Tetsuro Tamura, Hiromasa Hoko, Koji Aizawa, Yoshiaki Tabuchi, Masaomi Yamaguchi, Yasuo Nara, Kazuhiro Takahashi, Satoshi Hasegawa
  • Publication number: 20070228432
    Abstract: The invention relates to a semiconductor element used for a nonvolatile semiconductor storage device or the like, a semiconductor storage device using the same, a data writing method thereof, a data reading method thereof and a manufacturing method of those, and has an object to provide a semiconductor element in which scaling and integration of cells are possible, storage characteristics of data are excellent, and reduction in power consumption is possible, a semiconductor storage device using the same, a data writing method thereof, a data reading method thereof, and a manufacturing method of those.
    Type: Application
    Filed: January 9, 2007
    Publication date: October 4, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Hiroshi Ishihara, Kenji Maruyama, Tetsuro Tamura, Hiromasa Hoko
  • Publication number: 20060081901
    Abstract: A ferroelectric memory device includes a gate electrode formed on a semiconductor body via a ferroelectric film, first and second diffusion regions being formed in the semiconductor body at respective sides of a channel region, wherein the ferroelectric film comprises a first region located in the vicinity of the first diffusion region, a second region located in the vicinity of the second diffusion region, and a third region located between the first and second regions, wherein the first, second and third regions carry respective, mutually independent polarizations.
    Type: Application
    Filed: September 8, 2005
    Publication date: April 20, 2006
    Applicants: FUJITSU LIMTED, TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Yoshihiro Arimoto, Hiroshi Ishihara, Tetsuro Tamura, Hiromasa Hoko, Koji Aizawa, Yoshiaki Tabuchi, Masaomi Yamaguchi, Yasuo Nara, Kazuhiro Takahashi, Satoshi Hasegawa
  • Patent number: 5436471
    Abstract: A Josephson junction apparatus comprises a polymeric film having flexibility, and a Josephson junction circuit formed on the polymeric film. The Josephson junction circuit includes a Josephson junction device and a wiring for connecting to the Josephson junction device. Namely, the Josephson junction apparatus has flexibility, and thus the Josephson junction apparatus can be placed not only on a flat surface but also it can be placed on a curved surface in practice. Furthermore, in the Josephson junction apparatus, when a functional polymeric film is used as a substrate of a Josephson junction of the Josephson junction device, a protective film is previously formed over the functional polymeric film, so that a wetting of the functional polymeric film, which is caused by water or organic solvents being used repeatedly during the manufacturing process, can be prevented and a dimensional stability of the film can be increased.
    Type: Grant
    Filed: April 14, 1994
    Date of Patent: July 25, 1995
    Assignee: Fujitsu Limited
    Inventor: Hiromasa Hoko
  • Patent number: 5131976
    Abstract: A Josephson junction apparatus comprises a polymeric film having flexiblity, and a Josephson junction circuit formed on the polymeric film. The Josephson junction circuit includes a Josephson junction device and a wiring for connecting to the Josephson junction device. Namely, the Josephson junction apparatus has flexibility, and thus the Josephson junction apparatus can be placed not only on a flat surface but also it can be placed on a curved surface in practice. Furthermore, in the Josephson junction apparatus, when a functional polymeric film is used as a substrate of a Josephson junction of the Josephson junction device, a protective film is previously formed over the functional polymeric film, so that a wetting of the functional polymer film, which is caused by water or organic solvents being used used repeatedly during the manufacturing process, can be prevented and a dimensional stability of the film can be increased.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: July 21, 1992
    Assignee: Fujitsu Limited
    Inventor: Hiromasa Hoko