Patents by Inventor Takanari Yasui

Takanari Yasui 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).

  • Nonvolatile memory
    Patent number: 6507509
    Abstract: High device reliability, a reduction in power consumption, and a high operation speed are achieved. When a predetermined bias voltage is applied between a source 1 and a drain 2 to change a gate voltage, a current discretely flows between the source 1 and the drain 2 in accordance with quantized electrostatic energy levels in an island electrode 3. The switching ON/OFF of the current between the source 1 and the drain 2 in this case is enabled by applying ½-electron charge to a gate. When the gate voltage induces polarization in a ferroelectric layer 6, its electric field is applied to the island electrode 3. The current between the source 1 and the drain 2 in this case can be measured with high sensitivity. Charge holding is carried out by the polarization in the ferroelectric layer 6, and stored data can be held even if power supply is cut off.
    Type: Grant
    Filed: August 17, 2001
    Date of Patent: January 14, 2003
    Assignees: Japan Science and Technology Corporation, NEC Corporation
    Inventors: Youichi Ohtsuka, Junichi Sone, Jaw-Shen Tsai, Takanari Yasui, Yasunobu Nakamura
  • Exhaust apparatus and vacuum pumping unit including the exhaust apparatus
    Patent number: 5727929
    Abstract: An exhaust apparatus and a high vacuum pumping unit including such high vacuum device and an auxiliary vacuum pump are disclosed, wherein a high vacuum is achieved in a vacuum vessel such that the gas molecules within the vacuum vessel are ionized and accelerated to be exhausted and, further, in the high vacuum pumping unit, those gas molecules diffused back or desorbed from the vacuum pump are ionized and accelerated to be returned to the vacuum pump.
    Type: Grant
    Filed: October 10, 1995
    Date of Patent: March 17, 1998
    Assignee: Ebara Corporation
    Inventors: Kazutoshi Nagai, Tohru Satake, Hideaki Hayashi, Takanari Yasui
  • Exhaust apparatus and vacuum pumping unit including the exhaust apparatus
    Patent number: 5480286
    Abstract: An exhaust apparatus and a high vacuum pumping unit including such high vacuum device and an auxiliary vacuum pump are disclosed, wherein a high vacuum is achieved in a vacuum vessel such that the gas molecules within the vacuum vessel are ionized and accelerated to be exhausted and, further, in the high vacuum pumping unit, those gas molecules diffused back or desorbed from the vacuum pump are ionized and accelerated to be returned to the vacuum pump.
    Type: Grant
    Filed: March 25, 1994
    Date of Patent: January 2, 1996
    Assignee: Ebara Corporation
    Inventors: Kazutoshi Nagai, Tohru Satake, Hideaki Hayashi, Takanari Yasui
  • Exhaust apparatus with vacuum pump
    Patent number: 5326227
    Abstract: An exhaust apparatus and a high vacuum pumping unit including a high vacuum device and an auxiliary vacuum pump are disclosed, wherein a high vacuum is achieved in a vacuum vessel such that the gas molecules within the vacuum vessel are ionized and accelerated to be exhausted. In the high vacuum pumping unit, those gas molecules are diffused back or released from the vacuum pump are ionized and accelerated to be returned to the vacuum pump.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: July 5, 1994
    Assignee: Ebara Corporation
    Inventors: Kazutoshi Nagai, Tohru Satake, Hideaki Hayashi, Takanari Yasui
  • Exhaust apparatus and vacuum pumping unit including the exhaust apparatus
    Patent number: 5240381
    Abstract: An exhaust apparatus and a high vacuum pumping unit including such high vacuum device and an auxiliary vacuum pump are disclosed, wherein a high vacuum is achieved in a vacuum vessel such that the gas molecules within the vacuum vessel are ionized and accelerated to be exhausted and, further, in the high vacuum pumping unit, those gas molecules diffused back or desorbed from the vacuum pump are ionized and accelerated to be returned to the vacuum pump.
    Type: Grant
    Filed: February 12, 1992
    Date of Patent: August 31, 1993
    Assignee: Ebara Corporation
    Inventors: Kazutoshi Nagai, Tohru Satake, Hideaki Hayashi, Takanari Yasui