Patents by Inventor Hiroki Katoh

Hiroki Katoh 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: 11005028
    Abstract: A piezoelectric composition including copper, germanium and a complex oxide represented by a compositional formula KmNbO3 and having a perovskite structure, in which m in the compositional formula satisfies 0.970?m?0.999, and with respect to 1 mol of the complex oxide, x mol % of copper in terms of a copper element and y mol % of germanium in terms of a germanium element are contained, wherein x satisfies 0.100?x?1.000 and y satisfies 0.000<y?1.500.
    Type: Grant
    Filed: March 19, 2019
    Date of Patent: May 11, 2021
    Assignee: TDK CORPORATION
    Inventors: Hiroki Katoh, Yuiko Hirose, Masakazu Hirose, Mirai Ishida
  • Publication number: 20210091298
    Abstract: A piezoelectric composition containing: a complex oxide having a perovskite structure represented by a general formula of ABO3; copper; and one or more elements selected from the group consisting of chromium, nickel and zinc, in which in ABO3, an A-site element is potassium and a B-site element is niobium, or niobium and tantalum, with respect to 1 mol of the complex oxide, a content ratio of the copper is ? mol % in terms of CuO, a content ratio of one or more elements selected from the group consisting of chromium, nickel and zinc is ? mol % in terms of CrO3/2, NiO, ZnO, ? satisfies a relationship of 0.2???2.5, and ? satisfies a relationship of 0.2???2.0.
    Type: Application
    Filed: March 19, 2019
    Publication date: March 25, 2021
    Applicant: TDK CORPORATION
    Inventors: Masakazu HIROSE, Yuiko HIROSE, Hiroki KATOH, Tamotsu SASAKI, Yuji UMEDA
  • Publication number: 20200313072
    Abstract: A piezoelectric composition having a complex oxide including potassium and niobium, in which the complex oxide has a first phase represented by a compositional formula KNbO3, and one or two phases selected from a second phase represented by a compositional formula K4Nb6O17 and a third phase represented by a compositional formula KNb3O8.
    Type: Application
    Filed: March 20, 2018
    Publication date: October 1, 2020
    Applicant: TDK CORPORATION
    Inventors: Yuiko HIROSE, Hiroki KATOH, Masakazu HIROSE
  • Publication number: 20200295252
    Abstract: A piezoelectric composition including copper and a complex oxide having a perovskite structure represented by a general formula ABO3, in which an A site element in the ABO3 is potassium or potassium and sodium, a B site element in the ABO3 is niobium or niobium and tantalum, the copper is included in n mol % in terms of a copper element with respect to 1 mol of the complex oxide, and n satisfies 0.100?n?1.000.
    Type: Application
    Filed: March 20, 2018
    Publication date: September 17, 2020
    Applicant: TDK CORPORATION
    Inventors: Hiroki KATOH, Yuiko HIROSE, Masakazu HIROSE
  • Publication number: 20200243748
    Abstract: A piezoelectric composition including manganese and a complex oxide having a perovskite structure represented by a general formula ABO3, wherein an A site element in the ABO3 is potassium or potassium and sodium, a B site element in the ABO3 is niobium, a concentration distribution of the manganese has a variation, and the variation shows a CV value of 35% or more and 440% or less.
    Type: Application
    Filed: March 20, 2018
    Publication date: July 30, 2020
    Applicant: TDK CORPORATION
    Inventors: Masakazu HIROSE, Yuiko HIROSE, Hiroki KATOH
  • Patent number: 10691040
    Abstract: An image forming apparatus has a photosensitive member, a plurality of corona chargers configured to charge the photosensitive member by corona discharge, a plurality of charge output circuits configured to output a charging voltage being applied to each of the corona chargers, a plurality of abnormal discharge detection circuits configured to output an abnormal discharge detection signal according to abnormal discharge occurring in each of the corona chargers, and a controller configured to have a common input port connected to the abnormal discharge detection circuits wherein the abnormal discharge detection signal output from each of the abnormal discharge detection circuits is input to the controller through the common input port. Each of the abnormal discharge detection circuits is connected to a corresponding one circuit out of the charge output circuits.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: June 23, 2020
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Hiroki Katoh
  • Publication number: 20190288181
    Abstract: A piezoelectric composition including copper, germanium and a complex oxide represented by a compositional formula KmNbO3 and having a perovskite structure, in which m in the compositional formula satisfies 0.970? m?0.999, and with respect to 1 mol of the complex oxide, x mol % of copper in terms of a copper element and y mol % of germanium in terms of a germanium element are contained, wherein x satisfies 0.100 ?x?1.000 and y satisfies 0.000<y?1.500.
    Type: Application
    Filed: March 19, 2019
    Publication date: September 19, 2019
    Applicant: TDK CORPORATION
    Inventors: Hiroki KATOH, Yuiko HIROSE, Masakazu HIROSE, Mirai ISHIDA
  • Patent number: 10268151
    Abstract: An image forming apparatus, including: a photoconductor configured to be rotatable; a charger configured to charge the photoconductor; an overcurrent detector configured to output an overcurrent detection signal in response to detection of an overcurrent in the charger; and a controller, wherein the controller is configured to execute: an obtaining process of obtaining the overcurrent detection signal output from the overcurrent detector; a first counting process of counting a first number of detections based on the overcurrent detection signal obtained in the obtaining process, the first number of detections being the number of the overcurrent detection signals synchronized with a first cycle corresponding to one rotation of the photoconductor; and a first determining process of determining whether the first number of detections is not smaller than a first threshold which is not smaller than 2.
    Type: Grant
    Filed: March 12, 2018
    Date of Patent: April 23, 2019
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Masamitsu Takahashi, Masahito Hamaya, Hiroki Katoh, Yudai Minami, Katsumi Inukai
  • Publication number: 20190079427
    Abstract: An image forming apparatus has a photosensitive member, a plurality of corona chargers configured to charge the photosensitive member by corona discharge, a plurality of charge output circuits configured to output a charging voltage being applied to each of the corona chargers, a plurality of abnormal discharge detection circuits configured to output an abnormal discharge detection signal according to abnormal discharge occurring in each of the corona chargers, and a controller configured to have a common input port connected to the abnormal discharge detection circuits wherein the abnormal discharge detection signal output from each of the abnormal discharge detection circuits is input to the controller through the common input port. Each of the abnormal discharge detection circuits is connected to a corresponding one circuit out of the charge output circuits.
    Type: Application
    Filed: March 27, 2018
    Publication date: March 14, 2019
    Inventor: Hiroki Katoh
  • Publication number: 20180259894
    Abstract: An image forming apparatus, including: a photoconductor configured to be rotatable; a charger configured to charge the photoconductor; an overcurrent detector configured to output an overcurrent detection signal in response to detection of an overcurrent in the charger; and a controller, wherein the controller is configured to execute: an obtaining process of obtaining the overcurrent detection signal output from the overcurrent detector; a first counting process of counting a first number of detections based on the overcurrent detection signal obtained in the obtaining process, the first number of detections being the number of the overcurrent detection signals synchronized with a first cycle corresponding to one rotation of the photoconductor; and a first determining process of determining whether the first number of detections is not smaller than a first threshold which is not smaller than 2.
    Type: Application
    Filed: March 12, 2018
    Publication date: September 13, 2018
    Inventors: Masamitsu Takahashi, Masahito Hamaya, Hiroki Katoh, Yudai Minami, Katsumi Inukai
  • Patent number: 10050922
    Abstract: A mail processing server includes a storage unit and a computation unit. The storage unit stores operation log data recording operations that a plurality of users performed on received email messages. Upon detection of a target email message addressed to a plurality of destination users, the computation unit produces priority data that describes priorities of individual destination users specified in the target email message, based on the operation log data in the storage unit.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: August 14, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Hiroaki Takahashi, Michio Masuno, Hiroki Katoh, Kazuhiro Hayashi
  • Patent number: 9905749
    Abstract: The present invention aims to provide a piezoelectric composition which is free of lead based compounds and is represented by the following formula (1), (Bi0.5xNa0.5xBa0.7y+zCa0.3y)a(Tix+y+0.8zHf0.2z)O3 (1), wherein, x, y, z and a in formula (1) meets the following conditions, 0.70x0.90, 0.02y0.28, 0.02z0.28, 0.90a1.10 and x+y+z=1. The present invention also provides a piezoelectric device having the piezoelectric composition mentioned above.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: February 27, 2018
    Assignee: TDK CORPORATION
    Inventor: Hiroki Katoh
  • Patent number: 9835969
    Abstract: An image forming apparatus is provided with a first photosensitive body, a second photosensitive body, a first charger configured to charge the first photosensitive body, a second charger configured to charge the second photosensitive body, a voltage outputting circuit, a voltage dropping circuit, and a controller. The controller is configured to selectively execute a first charging control to apply a first voltage to the first charger and the second charger, the first voltage being an output of the voltage outputting circuit, and a second charging control to apply the first voltage to the first charger a second voltage to the second charger, the second voltage being less than the first voltage, the first voltage being an input of the voltage dropping circuit and the second voltage being an output of the voltage dropping circuit.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: December 5, 2017
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Masamitsu Takahashi, Masahito Hamaya, Hiroki Katoh
  • Patent number: 9831418
    Abstract: The present invention aims to provide a piezoelectric composition and a piezoelectric element. In the piezoelectric composition, the main component is represented by the following formula with a perovskite type structure, (Bi(0.5x+y+z)Na0.5x)m(Ti(x+0.5y)Mg0.5yMez)O3 wherein, 0.05?x?0.7, 0.01?y?0.7, 0.01?z?0.6, 0.75?m?1.0, x+y+z=1 and the transition metal element Me is any one or more selected from the group consisting of Mn, Cr, Fe and Co.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: November 28, 2017
    Assignee: TDK CORPORATION
    Inventors: Taku Masai, Masahito Furukawa, Hiroki Katoh
  • Publication number: 20170038700
    Abstract: An image forming apparatus is provided with a first photosensitive body, a second photosensitive body, a first charger configured to charge the first photosensitive body, a second charger configured to charge the second photosensitive body, a voltage outputting circuit, a voltage dropping circuit, and a controller. The controller is configured to selectively execute a first charging control to apply a first voltage to the first charger and the second charger, the first voltage being an output of the voltage outputting circuit, and a second charging control to apply the first voltage to the first charger a second voltage to the second charger, the second voltage being less than the first voltage, the first voltage being an input of the voltage dropping circuit and the second voltage being an output of the voltage dropping circuit.
    Type: Application
    Filed: August 4, 2016
    Publication date: February 9, 2017
    Applicant: Brother Kogyo Kabushiki Kaisha
    Inventors: Masamitsu TAKAHASHI, Masahito HAMAYA, Hiroki KATOH
  • Publication number: 20160357960
    Abstract: A computer-readable medium which stores an abnormality detection program causes a computer to execute processes including detecting, when a work corresponding to a process on the computer has been executed, at least one event that is associated with the process on the computer, the at least one event including at least one first event which respectively occurs in response to at least one input for the process by using the input device and determining whether the work is abnormal or not based on whether the at least one detected event matches at least one stored event in a storage unit or not.
    Type: Application
    Filed: May 31, 2016
    Publication date: December 8, 2016
    Applicant: FUJITSU LIMITED
    Inventors: Hiroki Katoh, Michio Masuno, Kazuhiro Hayashi, Hiroaki Takahashi
  • Publication number: 20160285811
    Abstract: A mail processing server includes a storage unit and a computation unit. The storage unit stores operation log data recording operations that a plurality of users performed on received email messages. Upon detection of a target email message addressed to a plurality of destination users, the computation unit produces priority data that describes priorities of individual destination users specified in the target email message, based on the operation log data in the storage unit.
    Type: Application
    Filed: March 10, 2016
    Publication date: September 29, 2016
    Applicant: FUJITSU LIMITED
    Inventors: Hiroaki Takahashi, Michio Masuno, Hiroki Katoh, Kazuhiro Hayashi
  • Publication number: 20160064644
    Abstract: The present invention aims to provide a piezoelectric composition which is free of lead based compounds and is represented by the following formula (1), (Bi0.5xNa0.5xBa0.7y+zCa0.3y)a(Tix+y+0.8zHf0.2z)O3 (1), wherein, x, y, z and a in formula (1) meets the following conditions, 0.70x0.90, 0.02y0.28, 0.02z0.28, 0.90a1.10 and x+y+z=1. The present invention also provides a piezoelectric device having the piezoelectric composition mentioned above.
    Type: Application
    Filed: August 21, 2015
    Publication date: March 3, 2016
    Inventor: Hiroki KATOH
  • Publication number: 20150221858
    Abstract: The present invention aims to provide a piezoelectric composition and a piezoelectric element. In the piezoelectric composition, the main component is represented by the following formula with a perovskite type structure, (Bi(0.5x+y+z)Na0.5x)m(Ti(x+0.5y)Mg0.5yMez)O3 wherein, 0.05?x?0.7, 0.01?y?0.7, 0.01?z?0.6, 0.75?m?1.0, x+y+z=1 and the transition metal element Me is any one or more selected from the group consisting of Mn, Cr, Fe and Co.
    Type: Application
    Filed: January 30, 2015
    Publication date: August 6, 2015
    Inventors: Taku MASAI, Masahito FURUKAWA, Hiroki KATOH
  • Publication number: 20040250082
    Abstract: A terminal of a user as an issuer of electronic information calculates a Digest value for a content and sends this Digest value and a key ID of the issuer user to an authentication center server device. The authentication center server device searches a key storage for a secret key corresponding to this key ID, generates a signature value by encrypting the Digest value with this secret key and responds the signature value to the user terminal. The user terminal forms an undersigned content by attaching the received signature value and key ID to signature object electronic information, and issues this content to a recipient. The terminal of the recipient user calculates a Digest value for the content in the undersigned content, and sends this Digest value, the signature value and the attachment key ID to the authentication center server device.
    Type: Application
    Filed: March 26, 2004
    Publication date: December 9, 2004
    Applicant: FUJITSU LIMITED
    Inventors: Tao Li, Junichi Koizumi, Hiroki Katoh, Tatsuhiro Miyazaki