Patents by Inventor Keiji Maruo

Keiji Maruo 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: 10732526
    Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer (3c) and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin represented by general formula (1). In general formula (1), Q1, Q2, Q3, and Q4 each represent a methyl group or a hydrogen atom. r, s, t, and u each represent a number greater than or equal to 15 and less than or equal to 35.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: August 4, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Keiji Maruo, Jun Azuma
  • Patent number: 10649351
    Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer (3c) and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin represented by general formula (1). In general formula (1), Q1, Q2, Q3, and Q4 each represent a methyl group or a hydrogen atom. r, s, t, and u each represent a number greater than or equal to 15 and less than or equal to 35.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: May 12, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Jun Azuma, Keiji Maruo
  • Publication number: 20190354027
    Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer (3c) and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin represented by general formula (1). In general formula (1), Q1, Q2, Q3, and Q4 each represent a methyl group or a hydrogen atom. r, s, t, and u each represent a number greater than or equal to 15 and less than or equal to 35.
    Type: Application
    Filed: November 30, 2017
    Publication date: November 21, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Jun AZUMA, Keiji MARUO
  • Publication number: 20190332023
    Abstract: An electrophotographic photosensitive member (1) includes a conductive substrate (2) and a photosensitive layer (3). The photosensitive layer (3) is a single-layer photosensitive layer (3c) and contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin includes a polyarylate resin represented by general formula (1). In general formula (1), Q1, Q2, Q3, and Q4 each represent a methyl group or a hydrogen atom. r, s, t, and u each represent a number greater than or equal to 15 and less than or equal to 35.
    Type: Application
    Filed: November 30, 2017
    Publication date: October 31, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Keiji MARUO, Jun AZUMA
  • Patent number: 10295918
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin (1). The polyarylate resin is represented by general formula (1). The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m. The photosensitive layer has a Vickers hardness of at least 17.0 HV.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: May 21, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Keiji Maruo, Jun Azuma
  • Patent number: 10241428
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: March 26, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Keiji Maruo
  • Patent number: 10191397
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin. The polyarylate resin is represented by general formula (1). The hole transport material contains a compound represented by general formula (HTM1), (HTM2), (HTM3), (HTM4), (HTM5), (HTM6), or (HTM7). The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m. The photosensitive layer has a Vickers hardness of at least 17.0 HV.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: January 29, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Keiji Maruo, Tomofumi Shimizu, Jun Azuma
  • Publication number: 20180046100
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin. The polyatylate resin is represented by general formula (1). The hole transport material contains a compound represented by general formula (HTM1), (HTM2), (HTM3), (HTM4), (HTM5), (HTM6), or (HTM7). The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m. The photosensitive layer has a Vickers hardness of at least 17.0 HV.
    Type: Application
    Filed: August 4, 2017
    Publication date: February 15, 2018
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Keiji MARUO, Tomofumi SHIMIZU, Jun AZUMA
  • Publication number: 20180046098
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m.
    Type: Application
    Filed: August 3, 2017
    Publication date: February 15, 2018
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Keiji MARUO
  • Publication number: 20180046101
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer is a single-layer photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The binder resin contains a polyarylate resin (1). The polyarylate resin is represented by general formula (1). The photosensitive layer has a scratch resistance depth of no greater than 0.50 ?m. The photosensitive layer has a Vickers hardness of at least 17.0 HV.
    Type: Application
    Filed: August 3, 2017
    Publication date: February 15, 2018
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Keiji MARUO, Jun AZUMA
  • Patent number: 9829811
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer contains at least a charge generating material, a hole transport material, and a binder resin. The hole transport material is a compound represented by the following general formula (1). The binder resin is a resin represented by the following general formula (2). In general formula (1), R1 and R3 each independently represent an alkyl group, an aryl group, an aralkyl group, or an alkoxy group; and R2 and R4 each independently represent an alkyl group, or an alkoxy group. In general formula (2), R23, R24, and R25 each independently represent a hydrogen atom, or a C1-4 alkyl group, at least one of R23, R24, and R25 representing a C1-4 alkyl group; p+q=1.00, and 0.35?p<1.00; and n represents 2 or 3.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: November 28, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Takahiro Oki, Keiji Maruo
  • Publication number: 20170003608
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer contains at least a charge generating material, a hole transport material, and a binder resin. The hole transport material is a compound represented by the following general formula (1). The binder resin is a resin represented by the following general formula (2). In general formula (1), R1 and R3 each independently represent an alkyl group, an aryl group, an aralkyl group, or an alkoxy group; and R2 and R4 each independently represent an alkyl group, or an alkoxy group. In general formula (2), R23, R24, and R25 each independently represent a hydrogen atom, or a C1-4 alkyl group, at least one of R23, R24, and R25 representing a C1-4 alkyl group; p+q=1.00, and 0.35?p<1,00; and n represents 2 or 3.
    Type: Application
    Filed: June 28, 2016
    Publication date: January 5, 2017
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun AZUMA, Takahiro OKI, Keiji MARUO
  • Patent number: 9448496
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer located on the charge generating layer. The charge transport layer contains a pigment that is absorptive with respect to a wavelength of exposed light. The pigment is a metal phthalocyanine pigment represented by General Formula (I) or a metal-free phthalocyanine pigment represented by General Formula (II), where X represents a sulfur atom or an oxygen atom. R1 represents an aryl group or an alkyl group. R2-R4 each represent a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, a phenoxy group, an alkylthio group, a phenylthio group, or a dialkylamino group. M represents a metal atom. Y represents non-substitution or an alkyl group, an alkoxy group, an aryloxy group, a halogen atom, an oxygen atom, or a hydroxyl group.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: September 20, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Keiji Maruo, Kensuke Okawa, Akihiko Ogata
  • Patent number: 9436104
    Abstract: An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, and a binder resin. The hole transport material contains an amine stilbene derivative represented by a general formula (1), and the binder resin contains a polycarbonate resin represented by a general formula (2).
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: September 6, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Jun Azuma, Keiji Maruo, Kensuke Okawa, Akihiko Ogata
  • Patent number: 9256144
    Abstract: An electrophotographic photosensitive member containing a terphenoquinone derivative represented by the following formula (1): wherein R1 to R5 may be the same or different and each represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms and optionally having an alkyl group having 1 to 12 carbon atoms, an aralkyl group having 6 to 12 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, or an alkoxy group having 2 to 6 carbon atoms.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: February 9, 2016
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hideki Okada, Keiji Maruo
  • Publication number: 20150338754
    Abstract: An electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The photosensitive layer includes a charge generating layer and a charge transport layer located on the charge generating layer. The charge transport layer contains a pigment that is absorptive with respect to a wavelength of exposed light. The pigment is a metal phthalocyanine pigment represented by General Formula (I) or a metal-free phthalocyanine pigment represented by General Formula (II), where X represents a sulfur atom or an oxygen atom. R1 represents an aryl group or an alkyl group. R2-R4 each represent a hydrogen atom, an alkyl group, an aryl group, an alkoxy group, a phenoxy group, an alkylthio group, a phenylthio group, or a dialkylamino group. M represents a metal atom. Y represents non-substitution or an alkyl group, an alkoxy group, an aryloxy group, a halogen atom, an oxygen atom, or a hydroxyl group.
    Type: Application
    Filed: May 22, 2015
    Publication date: November 26, 2015
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun AZUMA, Keiji MARUO, Kensuke OKAWA, Akihiko OGATA
  • Patent number: 9141007
    Abstract: Provided is a monolayer type photoconductor superior in sensitivity characteristics that allows reliable production by easy confirmation of the sensitivity characteristics, and an image forming device using such a monolayer type photoconductor. A monolayer type photoconductor including a base body and a single photo sensitive layer formed on the base body, the single photo sensitive layer containing a charge generating agent, a hole transfer agent, an electron transfer agent and a binding resin, wherein a maximum absorption wavelength (?max) of the photo sensitive layer is set to a value of below 850 nm and an absorbance (A850) of light at a wavelength of 850 nm per unit thickness of the photo sensitive layer is set to a value of 0.05 ?m?1 or less.
    Type: Grant
    Filed: March 13, 2008
    Date of Patent: September 22, 2015
    Assignee: Kyocera Mita Corporation
    Inventors: Kazunari Hamasaki, Yuko Iwashita, Daisuke Kuboshima, Keiji Maruo, Shiho Kuboshima
  • Patent number: 9023564
    Abstract: The present disclosure relates to an azoquinone compound represented by formula (1) below. In formula (1), R1 to R4 are identical or different and each represents a hydrogen atom, a C1 to C6 alkyl group or a C6 to C12 aryl group, and Ar represents a C6 to C12 aryl group.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: May 5, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Hideki Okada, Keiji Maruo
  • Publication number: 20150037069
    Abstract: An electrophotographic photosensitive member containing a terphenoquinone derivative represented by the following formula (1): wherein R1 to R5 may be the same or different and each represent a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms and optionally having an alkyl group having 1 to 12 carbon atoms, an aralkyl group having 6 to 12 carbon atoms, a cycloalkyl group having 3 to 10 carbon atoms, or an alkoxy group having 2 to 6 carbon atoms.
    Type: Application
    Filed: July 28, 2014
    Publication date: February 5, 2015
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Hideki OKADA, Keiji MARUO
  • Publication number: 20140356773
    Abstract: An electrophotographic photosensitive member includes a photosensitive layer. The photosensitive layer contains a charge generating material, a hole transport material, and a binder resin. The hole transport material contains an amine stilbene derivative represented by a general formula (1), and the binder resin contains a polycarbonate resin represented by a general formula (2).
    Type: Application
    Filed: May 28, 2014
    Publication date: December 4, 2014
    Applicant: KYOCERA DOCUMENTS SOLUTIONS, INC.
    Inventors: Jun AZUMA, Keiji MARUO, Kensuke OKAWA, Akihiko OGATA