Patents by Inventor Naoki Asari

Naoki Asari 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: 9972467
    Abstract: A vacuum valve according to embodiments of the present disclosure comprise a prescribed shaped vacuum insulation vessel 1 having openings on its both ends, sealing metal fittings 2,3 configured to seal the openings of the vacuum insulation vessel 1 respectively, and a pair of contact points 5,6 which can be brought into contact or out of contact with each other and is arranged within the vacuum insulation vessel 1, wherein the vacuum insulation vessel 1 includes a base material layer 1c of aluminum oxide, a 1st oxidization promotion layer 1a whose oxygen combination was promoted, which 1st oxidization promotion layer 1a is formed on the inner circumference of the base material layer 1c, and a 2nd oxidization promotion layer 1b whose oxygen combination was promoted, which 2nd oxidization promotion layer 1b is formed on the outer circumference of the base material layer 1c.
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: May 15, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Naoki Asari, Junichi Sato, Tetsu Shioiri, Yuki Sekimori
  • Publication number: 20160329181
    Abstract: A vacuum valve according to embodiments of the present disclosure comprise a prescribed shaped vacuum insulation vessel 1 having openings on its both ends, sealing metal fittings 2,3 configured to seal the openings of the vacuum insulation vessel 1 respectively, and a pair of contact points 5,6 which can be brought into contact or out of contact with each other and is arranged within the vacuum insulation vessel 1, wherein the vacuum insulation vessel 1 includes a base material layer 1c of aluminum oxide, a 1st oxidization promotion layer la whose oxygen combination was promoted, which 1st oxidization promotion layer 1a is formed on the inner circumference of the base material layer 1c, and a 2nd oxidization promotion layer 1b whose oxygen combination was promoted, which 2nd oxidization promotion layer 1b is formed on the outer circumference of the base material layer 1c.
    Type: Application
    Filed: July 22, 2016
    Publication date: November 10, 2016
    Inventors: Naoki Asari, Junichi Sato, Tetsu Shioiri, Yuki Sekimori
  • Publication number: 20150280421
    Abstract: A direct-current interrupter in an embodiment includes a current-carrying path and a current-interrupting path connected in parallel to the current-carrying path. The current-carrying path includes a first switch and a second switch connected in series and a resistor connected in parallel to the second switch. The first switch has a predetermined first withstand voltage property and switches between conduction and non-conduction of current by using no semiconductor switch. The second switch has a second withstand voltage property lower in withstand voltage property than the first withstand voltage property and switches between conduction and non-conduction of current by using no semiconductor switch. The resistor protects the second switch from voltage to be applied to the second switch. The current-interrupting path includes a semiconductor switch and a current source connected in series and a non-linear resistor connected in parallel to a series connection of the semiconductor switch and the current source.
    Type: Application
    Filed: March 31, 2015
    Publication date: October 1, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshimitsu NIWA, Junichi SATO, Naoki ASARI, Nobutaka KUBOTA
  • Publication number: 20140374383
    Abstract: According to one embodiment, a tank-type vacuum circuit breaker includes a tank, a vacuum valve provided in the tank, an insulating layer provided on an outer circumference of the vacuum valve, having a fixed side interface connecting portion and a movable side interface connecting portion, a grounding layer provided on an outer circumference of the insulating layer, a fixed side bushing having an interface connecting portion connected to the fixed side interface connecting portion, a fixed side porcelain tube to house the fixed side bushing, a movable side bushing having an interface connecting portion connected to the movable side interface connecting portion, a movable side porcelain tube to house the movable side bushing, and insulation gas filled in the tank, at an approximately atmospheric pressure.
    Type: Application
    Filed: June 23, 2014
    Publication date: December 25, 2014
    Inventors: Tetsu Shioiri, Yuuki Fujii, Naoki Asari, Junichi Sato, Nobutaka Kubota