Patents by Inventor Hiroko Hirano

Hiroko Hirano 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).

  • Carbon fiber precursor acrylic fiber, carbon fiber, and method for producing same
    Patent number: 11959197
    Abstract: A first aspect of the present invention is carbon fiber wherein the surface of a monofilament has a center line average roughness Ra of 6.0 nm or more and 13 nm or less, and the monofilament has a long diameter/short diameter ratio of 1.11 or more and 1.245 or less. A second aspect of the present invention is carbon fiber precursor acrylic fiber wherein the surface of a monofilament has a center line average roughness Ra of 18 nm or more and 27 nm or less, and the monofilament has a long diameter/short diameter ratio of 1.11 or more and 1.245 or less. The carbon fiber according to the first aspect is obtained by stabilizing and carbonizing under specific conditions the carbon fiber precursor acrylic fiber according to the second aspect.
    Type: Grant
    Filed: August 15, 2019
    Date of Patent: April 16, 2024
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Naomasa Matsuyama, Yuutarou Nakamura, Norifumi Hirota, Hiroko Matsumura, Katsuhiko Ikeda, Kouki Wakabayashi, Tadashi Ootani, Akihiro Itou, Kenji Hirano, Akito Hatayama, Kenji Kaneta, Atsushi Nakajima
  • Method and apparatus for performing a charging process on an image carrying device
    Patent number: 7344615
    Abstract: A charge roller that includes a metal core, an elastic member configured wrapped around the metal core, and film members is disclosed. Each of the film members is wrapped around each end of the elastic member in a circumferential direction of the metal core such that at least a part of each of the film members exists at every position around the ends of the elastic member in an axial direction of the metal core. Portions of the film members do not overlap each other in an radial direction of the metal core.
    Type: Grant
    Filed: October 17, 2005
    Date of Patent: March 18, 2008
    Assignee: Ricoh Company, Ltd.
    Inventors: Masumi Sato, Hiroshi Yoshinaga, Yukiko Iwasaki, Hitoshi Ishibashi, Takatsugu Fujishiro, Masami Hiramatsu, Hiroko Hirano
  • Method and apparatus for performing a charging process on an image carrying device
    Publication number: 20060032581
    Abstract: A charge roller that includes a metal core, an elastic member configured wrapped around the metal core, and film members is disclosed. Each of the film members is wrapped around each end of the elastic member in a circumferential direction of the metal core such that at least a part of each of the film members exists at every position around the ends of the elastic member in an axial direction of the metal core. Portions of the film members do not overlap each other in an radial direction of the metal core.
    Type: Application
    Filed: October 17, 2005
    Publication date: February 16, 2006
    Inventors: Masumi Sato, Hiroshi Yoshinaga, Yukiko Iwasaki, Hitoshi Ishibashi, Takatsugu Fujishiro, Masami Hiramatsu, Hiroko Hirano
  • Method and apparatus for performing a charging process on an image carrying device
    Patent number: 6977022
    Abstract: A charge roller that includes a metal core, an elastic member configured wrapped around the metal core, and film members is disclosed. Each of the film members is wrapped around each end of the elastic member in a circumferential direction of the metal core such that at least a part of each of the film members exists at every position around the ends of the elastic member in an axial direction of the metal core. Portions of the film members do not overlap each other in an radial direction of the metal core.
    Type: Grant
    Filed: December 10, 2002
    Date of Patent: December 20, 2005
    Assignee: Ricoh Company, Ltd.
    Inventors: Masumi Sato, Hiroshi Yoshinaga, Yukiko Iwasaki, Hitoshi Ishibashi, Takatsugu Fujishiro, Masami Hiramatsu, Hiroko Hirano
  • Method and apparatus for performing a charging process on an image carrying device
    Publication number: 20030083180
    Abstract: A charge roller that includes a metal core, an elastic member configured wrapped around the metal core, and film members is disclosed. Each of the film members is wrapped around each end of the elastic member in a circumferential direction of the metal core such that at least a part of each of the film members exists at every position around the ends of the elastic member in an axial direction of the metal core. Portions of the film members do not overlap each other in an radial direction of the metal core.
    Type: Application
    Filed: December 10, 2002
    Publication date: May 1, 2003
    Inventors: Masumi Sato, Hiroshi Yoshinaga, Yukiko Iwasaki, Hitoshi Ishibashi, Takatsugu Fujishiro, Masami Hiramatsu, Hiroko Hirano
  • Method and apparatus for performing a charging process on an image carrying device
    Patent number: 6546219
    Abstract: A charge roller that includes a metal core, an elastic member configured wrapped around the metal core, and film members is disclosed. Each of the film members is wrapped around each end of the elastic member in a circumferential direction of the metal core such that at least a part of each of the film members exists at every position around the ends of the elastic member in an axial direction of the metal core. Portions of the film members do not overlap each other in an radial direction of the metal core.
    Type: Grant
    Filed: February 8, 2001
    Date of Patent: April 8, 2003
    Assignee: Ricoh Company, Ltd.
    Inventors: Masumi Sato, Hiroshi Yoshinaga, Yukiko Iwasaki, Hitoshi Ishibashi, Takatsugu Fujishiro, Masami Hiramatsu, Hiroko Hirano
  • Method and apparatus for performing a charging process on an image carrying device
    Publication number: 20010017995
    Abstract: A charge roller that includes a metal core, an elastic member configured wrapped around the metal core, and film members is disclosed. Each of the film members is wrapped around each end of the elastic member in a circumferential direction of the metal core such that at least a part of each of the film members exists at every position around the ends of the elastic member in an axial direction of the metal core. Portions of the film members do not overlap each other in an radial direction of the metal core.
    Type: Application
    Filed: February 8, 2001
    Publication date: August 30, 2001
    Applicant: RICOH COMPANY, LTD.
    Inventors: Masumi Sato, Hiroshi Yoshinaga, Yukiko Iwasaki, Hitoshi Ishibashi, Takatsugu Fujishiro, Masami Hiramatsu, Hiroko Hirano
  • Electronic copying machine
    Patent number: D947276
    Type: Grant
    Filed: January 24, 2019
    Date of Patent: March 29, 2022
    Assignee: KONICA MINOLTA, INC.
    Inventors: Hiroko Hirano, Kenichiro Uchihara, Yu Iritani, Masakazu Nagano, Thomas Edward Keen, Nicholas Woodley, James Holt, Astrid Nathalie Xavier Vanhuyse, Solène Lemare Toneatti