Patents by Inventor Tomofumi SHIMIZU

Tomofumi SHIMIZU 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).

  • Publication number: 20180148538
    Abstract: A polyarylate resin is represented by general formula (1) shown below. In general formula (1), R1 and R2 each represent, independently of one another, a hydrogen atom or a methyl group. r and s each represent an integer of at least 0 and no greater than 49. t and u each represent an integer of at least 1 and no greater than 50. r+s+t+u=100. r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), chemical formula (1-2), chemical formula (1-3), or chemical formula (1-4). X and Y are different from one another.
    Type: Application
    Filed: November 28, 2017
    Publication date: May 31, 2018
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun AZUMA, Kenji KITAGUCHI, Kensuke OKAWA, Seiki HASUNUMA, Tomofumi SHIMIZU
  • 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
  • Publication number: 20180046099
    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 binder resin contains a polyarylate resin represented by general formula (1). In general formula (1), r and s each represent an integer of at least 0 and no greater than 49 and t and u represents an integer of at least 1 and no greater than 50. Furthermore, r+s+t+u=100 and r+t=s+u. X and Y each represent, independently of one another, a divalent group represented by chemical formula (1-1), (1-2), (1-3), or (1-4).
    Type: Application
    Filed: August 4, 2017
    Publication date: February 15, 2018
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Jun AZUMA, Kensuke OKAWA, Seiki HASUNUMA, Tomofumi SHIMIZU
  • Publication number: 20170068177
    Abstract: A single-layer electrophotographic photosensitive member includes a conductive substrate and a photosensitive layer. The conductive substrate contains aluminum or an aluminum alloy. A surface of the conductive substrate has an aluminum oxide film or an aluminum alloy oxide film. The photosensitive layer is disposed directly on the conductive substrate. The photosensitive layer contains an electron transport material. The electron transport material has a reduction potential of at least ?0.88 V and no greater than ?0.66 V versus a reference electrode (Ag/Ag+). The single-layer electrophotographic photosensitive member has a leakage onset voltage of at least 5.0 kV in a high temperature and humidity environment at a temperature of 30° C. and a relative humidity of 80%. The leakage onset voltage is a voltage applied to the single-layer electrophotographic photosensitive member at which current leakage starts.
    Type: Application
    Filed: August 26, 2016
    Publication date: March 9, 2017
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Junichiro OTSUBO, Yasuhiro OISHI
  • Patent number: 9541849
    Abstract: A positively chargeable single-layer electrophotographic photosensitive member includes a single-layer photosensitive layer. The single-layer photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The electron transport material contains two or more compounds selected from the group consisting of compounds represented by the chemical formulas (1) to (4) below.
    Type: Grant
    Filed: February 26, 2014
    Date of Patent: January 10, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Hiroki Tsurumi, Yohei Yamamoto, Eiichi Miyamoto
  • Publication number: 20160282732
    Abstract: A positively chargeable single-layer 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, an electron transport material, and an electron accepting compound. The hole transport material includes a benzidine derivative. The electron transport material includes at least one compound selected from the group consisting of compounds represented by general formulae (1), (2), (3), and (4) shown below. The electron accepting compound includes at least one compound selected from the group consisting of compounds represented by general formulae (5) and (6) shown below.
    Type: Application
    Filed: March 22, 2016
    Publication date: September 29, 2016
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi SHIMIZU, Makoto SHISHIDO
  • Patent number: 8980507
    Abstract: A positively chargeable monolayer electrophotographic photosensitive member includes a photosensitive layer provided on a conductive substrate and having a monolayer structure containing at least a charge generating material, a hole transport material, an electron transport material, and a binder resin. The photosensitive layer contains a hole transport material containing a triarylamine derivative represented by a formula (1) below and an electron transport material containing a compound selected from the group consisting of quinone compounds having a predetermined structure.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: March 17, 2015
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Tomofumi Shimizu, Eiichi Miyamoto, Hiroki Tsurumi
  • Publication number: 20140242507
    Abstract: A positively chargeable single-layer electrophotographic photosensitive member includes a single-layer photosensitive layer. The single-layer photosensitive layer contains a charge generating material, a hole transport material, an electron transport material, and a binder resin. The electron transport material contains two or more compounds selected from the group consisting of compounds represented by the chemical formulas (1) to (4) below.
    Type: Application
    Filed: February 26, 2014
    Publication date: August 28, 2014
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Tomofumi SHIMIZU, Hiroki TSURUMI, Yohei YAMAMOTO, Eiichi MIYAMOTO
  • Publication number: 20140154619
    Abstract: A positively chargeable monolayer electrophotographic photosensitive member includes a photosensitive layer provided on a conductive substrate and having a monolayer structure containing at least a charge generating material, a hole transport material, an electron transport material, and a binder resin. The photosensitive layer contains a hole transport material containing a triarylamine derivative represented by a formula (1) below and an electron transport material containing a compound selected from the group consisting of quinone compounds having a predetermined structure.
    Type: Application
    Filed: November 26, 2013
    Publication date: June 5, 2014
    Applicant: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventors: Tomofumi SHIMIZU, Eiichi MIYAMOTO, Hiroki TSURUMI