Patents by Inventor Kenichi Kuroda

Kenichi Kuroda 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: 10476402
    Abstract: In a multilevel converter, three switches are connected between three arms and three reactors, and three resistive elements are connected to the respective three switches in parallel. The three switches are configured to be in a conductive state during a normal operation. The three switches are configured to come into a non-conductive state when a short circuit accident occurs between two DC power transmission lines, whereby an inter-arm direct current flowing in four arms and the like is quickly attenuated by the three resistive elements.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: November 12, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ryosuke Uda, Kenichi Kuroda, Masashi Kitayama
  • Patent number: 10396678
    Abstract: In a multilevel converter, three first rectifying elements are respectively connected between three arms and a negative voltage terminal. Three second rectifying elements are respectively connected to the three first rectifying elements in antiparallel. During a normal operation, current flows in the three first rectifying elements and the three second rectifying elements. When a short circuit accident occurs between two DC power transmission lines, the three first rectifying elements are brought into the non-conductive state, thereby interrupting and quickly attenuating inter-arm direct current flowing in four arms and the like.
    Type: Grant
    Filed: October 8, 2014
    Date of Patent: August 27, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ryosuke Uda, Kenichi Kuroda, Masashi Kitayama
  • Patent number: 10363808
    Abstract: The wheel drive motor according to the invention includes a motor shaft (35) having a large diameter portion (35d) located at a central part in the axial direction and a small diameter portion (35b) located on a first side in the axial direction, a bearing (36b) rotatably supporting the small diameter portion (35b), and a rotor (24) secured to an outer circumferential surface (35j) of the large diameter portion (35d). An end part (24p) of the rotor (24) located on the first side in the axial direction projects over an end face (35e) of the large diameter portion (35d) located on the first side in the axial direction toward the side on which the small diameter portion (35b) is.
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: July 30, 2019
    Assignee: NTN CORPORATION
    Inventors: Tomohisa Uozumi, Masaru Kuroda, Kenichi Suzuki
  • Publication number: 20190068076
    Abstract: Each arm circuit of a power conversion device includes a plurality of cascaded cell blocks and a plurality of bypass circuits connected in parallel to the respective cell blocks. Each cell block includes: a first connection node on a high potential side and a second connection node on a low potential side for connection to another cell block; and a plurality of converter cells cascaded between the first and second connection nodes, each converter cell containing an energy storage. The plurality of converter cells include at least one first converter cell of a full-bridge (or hybrid) configuration and at least one second converter cell of a half-bridge configuration.
    Type: Application
    Filed: March 28, 2016
    Publication date: February 28, 2019
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ryosuke Uda, Kenichi Kuroda, Masashi Kitayama, Yoshiyuki Kono, Shigeo Hayashi
  • Patent number: 10075091
    Abstract: In a multilevel converter, three circuit breakers are respectively connected between three arms and three reactors. One circuit breaker is a DC circuit breaker configured to interrupt direct current when a short circuit accident occurs between two DC power transmission lines. Each of the two circuit breakers is an AC circuit breaker configured to interrupt alternating current when the short circuit accident occurs. When the short circuit accident occurs, the two AC circuit breakers are brought into the non-conductive state and then the DC circuit breaker is brought into the non-conductive state, thereby interrupting the short circuit current.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: September 11, 2018
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kenichi Kuroda, Ryosuke Uda, Masashi Kitayama
  • Publication number: 20180109200
    Abstract: In a multilevel converter, three circuit breakers are respectively connected between three arms and three reactors. One circuit breaker is a DC circuit breaker configured to interrupt direct current when a short circuit accident occurs between two DC power transmission lines. Each of the two circuit breakers is an AC circuit breaker configured to interrupt alternating current when the short circuit accident occurs. When the short circuit accident occurs, the two AC circuit breakers are brought into the non-conductive state and then the DC circuit breaker is brought into the non-conductive state, thereby interrupting the short circuit current.
    Type: Application
    Filed: April 24, 2015
    Publication date: April 19, 2018
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kenichi KURODA, Ryosuke UDA, Masashi KITAYAMA
  • Patent number: 9880490
    Abstract: A nonporous semiconductive roller is provided, which constantly ensures proper image formation substantially without image density unevenness attributable to the roughness of an outer peripheral extrusion surface thereof when being used as a developing roller. The semiconductive roller (1) is made of a nonporous crosslinking product of a rubber composition which contains a rubber component including only four types of rubbers including an epichlorohydrin rubber, a chloroprene rubber, a butadiene rubber and an acrylonitrile butadiene rubber.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: January 30, 2018
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenichi Kuroda, Kei Tajima
  • Patent number: 9840612
    Abstract: A semiconductive roller according to the present invention includes a crosslinked product containing just the three types of rubber of butadiene rubber, epichlorohydrin rubber, and chloroprene rubber as rubber components, has a non-porous, single-layer structure, and has a compression set Cs (%) of not more than 10% as measured in accordance with the measurement method described in the Japanese Industrial Standards JIS K6262:2006 under conditions of a test temperature of 70° C., a test time of 24 hours, and a compression ratio of 25%.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: December 12, 2017
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kenichi Kuroda
  • Patent number: 9823600
    Abstract: A semiconductive roller of the present invention includes a crosslinked product of a rubber composition containing just the two types of rubber of butadiene rubber and epichlorohydrin rubber as rubber components.
    Type: Grant
    Filed: February 2, 2015
    Date of Patent: November 21, 2017
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kenichi Kuroda
  • Publication number: 20170310237
    Abstract: In a multilevel converter, three first rectifying elements are respectively connected between three arms and a negative voltage terminal. Three second rectifying elements are respectively connected to the three first rectifying elements in antiparallel. During a normal operation, current flows in the three first rectifying elements and the three second rectifying elements. When a short circuit accident occurs between two DC power transmission lines, the three first rectifying elements are brought into the non-conductive state, thereby interrupting and quickly attenuating inter-arm direct current flowing in four arms and the like.
    Type: Application
    Filed: October 8, 2014
    Publication date: October 26, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Ryosuke UDA, Kenichi KURODA, Masashi KITAYAMA
  • Publication number: 20170288569
    Abstract: In a multilevel converter, three switches are connected between three arms and three reactors, and three resistive elements are connected to the respective three switches in parallel. The three switches are configured to be in a conductive state during a normal operation. The three switches are configured to come into a non-conductive state when a short circuit accident occurs between two DC power transmission lines, whereby an inter-arm direct current flowing in four arms and the like is quickly attenuated by the three resistive elements.
    Type: Application
    Filed: October 8, 2014
    Publication date: October 5, 2017
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Ryosuke UDA, Kenichi KURODA, Masashi KITAYAMA
  • Patent number: 9727005
    Abstract: A semiconductive roller is provided, which has a toner transport amount and a toner charge amount properly controlled, particularly, when being used as a developing roller, and is substantially free from imaging failure such as fogging and background smudging. The semiconductive roller is formed from a semiconductive rubber composition, and has an outer peripheral surface having a surface roughness defined by a roughness profile such that an arithmetic average roughness is not greater than 0.7 ?m and a difference R?c between vertical section levels at two different load length percentages (at a load length percentage Rmr1 of 25% and a load length percentage Rmr2 of 75%) is not greater than 1.2 ?m.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: August 8, 2017
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kenichi Kuroda
  • Publication number: 20170168415
    Abstract: An electrically conductive rubber composition is provided, which is usable for production of a developing roller imparted with proper flexibility without the use of a softening agent without the formation of a shield layer and permits the developing roller to form an image substantially free from image forming defects such as banding and fogging. A developing roller employing the electrically conductive rubber composition is also provided. The electrically conductive rubber composition contains a rubber component including only four types of rubbers, i.e., an epichlorohydrin rubber, a butadiene rubber, a chloroprene rubber and an acrylonitrile butadiene rubber, and a crosslinking component including 0.75 to 2.25 parts by mass of sulfur and 0.25 to 0.75 parts by mass of a thiuram accelerating agent based on 100 parts by mass of the overall rubber component. The developing roller (1) is produced from the electrically conductive rubber composition.
    Type: Application
    Filed: November 30, 2016
    Publication date: June 15, 2017
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenichi KURODA, Kei TAJIMA
  • Publication number: 20170168416
    Abstract: An electrically conductive rubber composition is provided, which is usable for production of a developing roller imparted with proper flexibility without the use of a softening agent without the formation of a shield layer and permits the developing roller to form an image substantially free from image unevenness due to permanent compressive deformation, banding, fogging and other defects. A developing roller employing the electrically conductive rubber composition is also provided. The electrically conductive rubber composition contains a rubber component including only four types of rubbers, i.e., an epichlorohydrin rubber, a butadiene rubber, a chloroprene rubber and an acrylonitrile butadiene rubber, and 0.75 to 2.25 parts by mass of sulfur, 0.25 to 1 part by mass of a thiuram accelerating agent, 0.75 to 2 parts by mass of a thiazole accelerating agent and 2.5 to 4.5 parts by mass of hydrotalcites based on 100 parts by mass of the overall rubber component.
    Type: Application
    Filed: November 30, 2016
    Publication date: June 15, 2017
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenichi KURODA, Kei TAJIMA
  • Publication number: 20170102635
    Abstract: A nonporous semiconductive roller is provided, which constantly ensures proper image formation substantially without image density unevenness attributable to the roughness of an outer peripheral extrusion surface thereof when being used as a developing roller. The semiconductive roller (1) is made of a nonporous crosslinking product of a rubber composition which contains a rubber component including only four types of rubbers including an epichlorohydrin rubber, a chloroprene rubber, a butadiene rubber and an acrylonitrile butadiene rubber.
    Type: Application
    Filed: September 28, 2016
    Publication date: April 13, 2017
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenichi KURODA, Kei TAJIMA
  • Patent number: 9547254
    Abstract: A semiconductive roller (1) is provided, which is formed from a rubber composition containing a rubber component including: (1) an epichlorohydrin rubber; (2) at least one solid rubber selected from the group consisting of a solid BR and a solid SBR; and (3) at least one liquid rubber selected from the group consisting of a liquid BR and a liquid SBR.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: January 17, 2017
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Kenichi Kuroda
  • Patent number: 9493319
    Abstract: An automatic document feeder includes a sheet feeding tray on which a document is stacked; a slit glass on which the document is scanned while moving; a discharge path in which the document is conveyed after the document is scanned; a document discharge unit to which the document is discharged through the discharge path; and a stamp device that makes a mark on a scanned surface of the document being in the discharge path. The stamp device includes a printing unit that faces the scanned surface of the document. The printing unit is movable between a first position at which the printing unit faces the document being in the discharge path and a second position at which the printing unit is retracted from the discharge path.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: November 15, 2016
    Assignee: RICOH COMPANY, LIMITED
    Inventors: Fumiaki Tsuchiya, Kenichi Kuroda, Yasuhiro Tomita, Maki Nishide
  • Patent number: 9465315
    Abstract: A semiconductive roller is provided which includes a roller body formed from a highly extrudable rubber composition containing an SBR and an epichlorohydrin rubber in combination as a rubber component, the roller body having a higher production yield and higher toner imaging durability, and unlikely to suffer from reduction in image density due to adhesion of toner and a contact mark on an outer peripheral surface thereof with a smaller compression set. In the rubber component, the SBR and the epichlorohydrin rubber are present in an SBR excess state. In the rubber composition, a crosslinking component for crosslinking the rubber component includes a sulfur crosslinking agent and 0.75 to 3 parts by mass of a thiazole accelerating agent based on 100 parts by mass of the rubber component. The roller body (2) of the semiconductive roller (1) is made of a crosslinking product of the rubber composition.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: October 11, 2016
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Yoshihisa Mizumoto, Takashi Marui, Kenichi Kuroda, Akihiko Kawatani
  • Publication number: 20160291505
    Abstract: A semiconductive roller (1) is provided, which is formed from a rubber composition containing a rubber component including: (1) an epichlorohydrin rubber; (2) at least one solid rubber selected from the group consisting of a solid BR and a solid SBR; and (3) at least one liquid rubber selected from the group consisting of a liquid BR and a liquid SBR.
    Type: Application
    Filed: March 22, 2016
    Publication date: October 6, 2016
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kenichi KURODA
  • Patent number: 9443637
    Abstract: A semiconductive roller (1) according to the present invention has a nonporous single-layer structure formed from a rubber composition which includes: a rubber component including a styrene butadiene rubber and an epichlorohydrin rubber; and a salt of an anion having a fluoro group and a sulfonyl group in its molecule; the salt being present in the rubber composition in a proportion of 0.05 to 5 parts by mass based on 100 parts by mass of the overall rubber component.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: September 13, 2016
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Yoshihisa Mizumoto, Takashi Marui, Kenichi Kuroda