Patents by Inventor Naoki Kitazawa

Naoki Kitazawa 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: 11264961
    Abstract: A semiconductor circuitry includes a first circuitry having a differential transistor pair and a pair of current sources connected in series to the differential transistor pair, a pair of transmission lines connected to the differential transistor pair at the opposite side to the current sources, and a second circuitry, connected to a node between the differential transistor pair and the current sources, and configured to test operations of at least the differential transistor pair and a latter-stage circuity connected to the transmission lines, in the state where the current outputs of the pair of current sources are stopped.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: March 1, 2022
    Assignee: KIOXIA CORPORATION
    Inventor: Naoki Kitazawa
  • Publication number: 20200295721
    Abstract: A semiconductor circuitry includes a first circuitry having a differential transistor pair and a pair of current sources connected in series to the differential transistor pair, a pair of transmission lines connected to the differential transistor pair at the opposite side to the current sources, and a second circuitry, connected to a node between the differential transistor pair and the current sources, and configured to test operations of at least the differential transistor pair and a latter-stage circuity connected to the transmission lines, in the state where the current outputs of the pair of current sources are stopped.
    Type: Application
    Filed: September 12, 2019
    Publication date: September 17, 2020
    Applicant: TOSHIBA MEMORY CORPORATION
    Inventor: Naoki KITAZAWA
  • Patent number: 10742458
    Abstract: According to an embodiment, a control circuit of an equalizer configured to set a first amount to a linear equalizer, determine a second amount optimizing a non-linear equalizer with respect to a first signal generated by the linear equalizer to which the first amount is set, set the second amount to the non-linear equalizer, update an amount from the first amount to a third amount smaller than the first amount based on a magnitude of the first amount, set the third amount to the linear equalizer, determine a fourth amount optimizing the non-linear equalizer with respect to a second signal generated by the linear equalizer to which the third amount is set, and update an amount from the second amount to the fourth amount.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: August 11, 2020
    Assignee: Toshiba Memory Corporation
    Inventors: Shinsuke Fujii, Naoki Kitazawa, Takaya Yamamoto, Tomohiko Ito
  • Patent number: 10476706
    Abstract: According to one embodiment, an equalizer circuit includes a nonlinear equalizer including: a determination circuit configured to generate a second signal indicating a digital value of a first signal, based on a first clock signal; a clock generation circuit configured to generate a second clock signal having a time constant of a falling edge larger than a time constant of a rising edge, based on the first clock signal; and a feedback circuit configured to generate a third signal by feeding back the second signal to the first signal, based on the second clock signal.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: November 12, 2019
    Assignee: Toshiba Memory Corporation
    Inventor: Naoki Kitazawa
  • Publication number: 20190296945
    Abstract: According to one embodiment, an equalizer circuit includes a nonlinear equalizer including: a determination circuit configured to generate a second signal indicating a digital value of a first signal, based on a first clock signal; a clock generation circuit configured to generate a second clock signal having a time constant of a falling edge larger than a time constant of a rising edge, based on the first clock signal; and a feedback circuit, configured to generate a third signal by feeding back the second signal to the first signal, based on the second clock signal.
    Type: Application
    Filed: September 7, 2018
    Publication date: September 26, 2019
    Inventor: Naoki Kitazawa
  • Publication number: 20190052488
    Abstract: According to an embodiment, a control circuit of an equalizer configured to set a first amount to a linear equalizer, determine a second amount optimizing a non-linear equalizer with respect to a first signal generated by the linear equalizer to which the first amount is set, set the second amount to the non-linear equalizer, update an amount from the first amount to a third amount smaller than the first amount based on a magnitude of the first amount, set the third amount to the linear equalizer, determine a fourth amount optimizing the non-linear equalizer with respect to a second signal generated by the linear equalizer to which the third amount is set, and update an amount from the second amount to the fourth amount.
    Type: Application
    Filed: August 9, 2018
    Publication date: February 14, 2019
    Inventors: Shinsuke Fujii, Naoki Kitazawa, Takaya Yamamoto, Tomohiko Ito
  • Patent number: 9797399
    Abstract: In the vane pump comprising the housing, the vane, and the cap, the sliding surface of the cap is configured as arc shape in the view from the rotational axis direction and the width toward the sliding direction of the cap is configured to be smaller than the width at the sliding angle field which is virtual area for contacting the inner surface of the pump room among the circumference including the arc shape of the sliding surface of the cap and to be bigger than the width at the high loading area where the load added to the sliding surface which is bigger than the predetermined value among the sliding angle field.
    Type: Grant
    Filed: October 2, 2015
    Date of Patent: October 24, 2017
    Assignee: TAIHO KOGYO CO., LTD.
    Inventor: Naoki Kitazawa
  • Publication number: 20160097391
    Abstract: In the vane pump comprising the housing, the vane, and the cap, the sliding surface of the cap is configured as arc shape in the view from the rotational axis direction and the width toward the sliding direction of the cap is configured to be smaller than the width at the sliding angle field which is virtual area for contacting the inner surface of the pump room among the circumference including the arc shape of the sliding surface of the cap and to be bigger than the width at the high loading area where the load added to the sliding surface which is bigger than the predetermined value among the sliding angle field.
    Type: Application
    Filed: October 2, 2015
    Publication date: April 7, 2016
    Applicant: TAIHO KOGYO CO., LTD.
    Inventor: Naoki KITAZAWA
  • Patent number: 5552480
    Abstract: There is disclosed a thermoplastic resin composition comprising as principal components a [A] thermoplastic resin having a functional group reactive with an amino group, a [B] olefinic polymer and/or styrenic polymer, the subtotal of the above [A]+[B] being 100 parts by weight, and 0.
    Type: Grant
    Filed: February 25, 1993
    Date of Patent: September 3, 1996
    Assignees: Idemitsu Petrochemical Co., Ltd., Dai-ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Yasuhisa Sugita, Naoki Kitazawa, Hiroshi Hotta
  • Patent number: 5420210
    Abstract: A novel formamide group-containing copolymer, or a salt thereof, which can be used as a high-molecular weight amino reagent, a starting material for functional high-molecular weight compounds, a starting material for adhesives, a polymer compatibilizer, a resin modifier, etc., and can undergo hydrolysis to give a copolymer containing a primary amino group, and a novel copolymer containing a primary amino group obtained by hydrolysis.
    Type: Grant
    Filed: July 29, 1992
    Date of Patent: May 30, 1995
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Naoki Kitazawa, Hiroshi Hotta, Hideyuki Sumi, Manabu Kikuta
  • Patent number: 5373065
    Abstract: A process for producing a novel formamide group-containing copolymer, or a salt thereof, which can be used as a high-molecular weight amino reagent, a starting material for functional high-molecular weight compounds, a starting material for adhesives, a polymer compatibilizer, a resin modifier, etc.
    Type: Grant
    Filed: November 9, 1993
    Date of Patent: December 13, 1994
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Naoki Kitazawa, Hiroshi Hotta, Yasuhisa Sugita, Katsutoshi Ohta
  • Patent number: 5332780
    Abstract: Thermoplastic resin compositions having the following component A-1 or A-2, component B and component C:(A-1): a polymer component having a functional group capable of reacting with an amino group, or(A-2): a composition of component (A-1) and a resin that is non-reactive with an amino group and is different from the resin used in the following component B(B) a thermoplastic resin component that is non-reactive with an amino group under the conditions required to mold the entire resin composition; and(C) a graft copolymer obtained by a graft reaction of a thermoplastic polymer, with a compound (I), or a copolymer having the repeating unit (II) and the repeating unit of an ethylenic unsaturated monomer, ##STR1## wherein R.sup.1 -R.sup.4, the same or different represent a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or an aralkyl group.
    Type: Grant
    Filed: April 8, 1993
    Date of Patent: July 26, 1994
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Naoki Kitazawa, Manabu Kikuta, Hiroshi Hotta, Yutaka Nakayama, Hideyuki Sumi