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: 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
  • Patent number: 9337147
    Abstract: A semiconductor device includes grooves defining an active region, including a MISFET, and dummy regions. A first interlayer insulation film is formed over the MISFET, the active region and the dummy regions. A first wiring, and first and second dummy wirings are formed over the first interlayer insulation film. A second interlayer insulation film is formed over the first wiring and the dummy wirings. The second dummy wirings are arranged between the first wiring and the first dummy wirings, and the pitch of the first dummy wirings is larger than that of the second dummy wirings. In planar view, the first and second dummy wirings are arranged over the dummy regions, and the size of each of the first dummy wirings is larger than size of each of the second dummy wirings. The first wiring and the first and second dummy wirings are formed of copper as a major component.
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: May 10, 2016
    Assignee: Renesas Electronics Corporation
    Inventors: Kenichi Kuroda, Kozo Watanabe, Hirohiko Yamamoto
  • Publication number: 20160026114
    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: Application
    Filed: July 23, 2015
    Publication date: January 28, 2016
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kenichi KURODA
  • Publication number: 20150355571
    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: Application
    Filed: June 3, 2015
    Publication date: December 10, 2015
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Yoshihisa MIZUMOTO, Takashi MARUI, Kenichi KURODA
  • Publication number: 20150315370
    Abstract: To provide a semiconductive roller which, when being used as a developing roller in combination with a positively chargeable toner, is capable of suppressing adhesion of the toner thereto to suppress reduction of image density, charging the toner to a higher toner charging level to ensure formation of higher-quality images, and suppressing reduction of toner charging level even after continuous repeated image formation to thereby suppress fogging of formed images for a longer period of time. The semiconductive roller (1) is made of a crosslinking product of a rubber composition containing at least an epichlorohydrin rubber and a chloroprene rubber, and has a fluorinated film (5) formed in an outer peripheral surface (4) thereof by treatment with fluorine gas.
    Type: Application
    Filed: March 16, 2015
    Publication date: November 5, 2015
    Applicants: TAKAMATSU TEISAN CO., LTD., SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenichi KURODA, Kazutaka MORI, Atsushi EGUCHI
  • Publication number: 20150287679
    Abstract: A semiconductor device includes grooves defining an active region, including a MISFET, and dummy regions. A first interlayer insulation film is formed over the MISFET, the active region and the dummy regions. A first wiring, and first and second dummy wirings are formed over the first interlayer insulation film. A second interlayer insulation film is formed over the first wiring and the dummy wirings. The second dummy wirings are arranged between the first wiring and the first dummy wirings, and the pitch of the first dummy wirings is larger than that of the second dummy wirings. In planar view, the first and second dummy wirings are arranged over the dummy regions, and the size of each of the first dummy wirings is larger than size of each of the second dummy wirings. The first wiring and the first and second dummy wirings are formed of copper as a major component.
    Type: Application
    Filed: June 19, 2015
    Publication date: October 8, 2015
    Inventors: Kenichi KURODA, Kozo WATANABE, Hirohiko YAMAMOTO
  • Publication number: 20150234314
    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: Application
    Filed: February 2, 2015
    Publication date: August 20, 2015
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kenichi KURODA
  • Publication number: 20150234313
    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: Application
    Filed: January 30, 2015
    Publication date: August 20, 2015
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventor: Kenichi KURODA
  • Patent number: 9075341
    Abstract: A developing roller is provided which is capable of forming a toner layer having the most uniform possible thickness on an outer peripheral surface of a roller body thereof. The roller body (2) of the developing roller (1) is formed from a rubber composition containing a base rubber which is a mixture of NBR and/or SBR, CR, an epichlorohydrin rubber and IIR, wherein the IIR is present in a proportion of not less than 2.5 parts by mass and not greater than 20 parts by mass in 100 parts by mass of the base rubber.
    Type: Grant
    Filed: June 17, 2013
    Date of Patent: July 7, 2015
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Akihiko Kawatani, Kenichi Kuroda
  • Patent number: 9075340
    Abstract: An inventive developing roller is adapted for use in an electrophotographic image forming apparatus. The developing roller includes a roller body. At least an outer peripheral surface of the roller body is formed from a rubber composition containing a base rubber. The base rubber contains a styrene butadiene rubber in a proportion of not less than 10 mass % and not greater than 70 mass % based on the overall amount of the base rubber. The outer peripheral surface of the rubber body has a surface roughness Ra of not less than 0.78 ?m and not greater than 1.8 ?m.
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: July 7, 2015
    Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kenichi Kuroda, Akihiko Kawatani, Yoshihisa Mizumoto
  • Patent number: 9064926
    Abstract: There is provided a technique for improving the flatness at the surface of members embedded in a plurality of recesses without resulting in an increase in the time required for the manufacturing processes. According to this technique, the dummy patterns can be placed up to the area near the boundary BL between the element forming region DA and dummy region FA by placing the first dummy pattern DP1 of relatively wider area and the second dummy pattern DP2 of relatively small area in the dummy region FA. Thereby, the flatness of the surface of the silicon oxide film embedded within the isolation groove can be improved over the entire part of the dummy region FA. Moreover, an increase of the mask data can be controlled when the first dummy patterns DP1 occupy a relatively wide region among the dummy region FA.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: June 23, 2015
    Assignee: Renesas Electronics Corporation
    Inventors: Kenichi Kuroda, Kozo Watanabe, Hirohiko Yamamoto
  • Patent number: 9059193
    Abstract: A silicon carbide semiconductor element, including: i) an n-type silicon carbide substrate doped with a dopant, such as nitrogen, at a concentration C, wherein the substrate has a lattice constant that decreases with doping; ii) an n-type silicon carbide epitaxially-grown layer doped with the dopant, but at a smaller concentration than the substrate; and iii) an n-type buffer layer doped with the dopant, and arranged between the substrate and the epitaxially-grown layer, wherein the buffer layer has a multilayer structure in which two or more layers having the same thickness are laminated, and is configured such that, based on a number of layers (N) in the multilayer structure, a doping concentration of a K-th layer from a silicon carbide epitaxially-grown layer side is C·K/(N+1).
    Type: Grant
    Filed: December 27, 2010
    Date of Patent: June 16, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenichi Ohtsuka, Kenichi Kuroda, Hiroshi Watanabe, Naoki Yutani, Hiroaki Sumitani
  • Patent number: 8983347
    Abstract: A developing roller is provided which is capable of forming a toner layer having the most uniform possible thickness on an outer peripheral surface of a roller body thereof. The roller body (2) of the developing roller (1) is formed from a rubber composition comprising: a base rubber which is a mixture comprising NBR and/or SBR, CR and an epichlorohydrin rubber; and not less than 2.5 parts by mass and not greater than 15 parts by mass of a tackiness imparting agent based on 100 parts by mass of the base rubber.
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: March 17, 2015
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Kenichi Kuroda, Akihiko Kawatani, Takashi Marui
  • Publication number: 20140319754
    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: Application
    Filed: April 17, 2014
    Publication date: October 30, 2014
    Applicant: RICOH COMPANY, LIMITED
    Inventors: Fumiaki TSUCHIYA, Kenichi KURODA, Yasuhiro TOMITA, Maki NISHIDE
  • Patent number: 8765168
    Abstract: Compositions of fluorapatite derivative crystals are disclosed herein. Also disclosed are methods of using these compositions to treat tooth sensitivity, to use as an anticaries treatment, to use as a restorative material, to use as a tooth surface whitener, and to combat or lessen the side effects of tooth whitening.
    Type: Grant
    Filed: November 8, 2010
    Date of Patent: July 1, 2014
    Assignee: The Regents of the University of Michigan
    Inventors: Brian H. Clarkson, Kenichi Kuroda
  • Patent number: 8744324
    Abstract: The semiconductive roller according to the present invention includes a roller body having an outer peripheral surface made of a crosslinked substance of a semiconductive rubber composition and exhibiting Shore A hardness of not more than 60, the semiconductive rubber composition contains a base polymer made of a mixture of (1) mixed rubber N of liquid nitrile rubber and solid nitrile rubber, (2) chloroprene rubber C, and (3) epichlorohydrin rubber E in a mass ratio (C+E)/N of 10/90 to 80/20, the ratios of the chloroprene rubber and the epichlorohydrin rubber in the total quantity of the base polymer are not less than 5 mass % and not less than 5 mass % respectively, and roller resistance at an applied voltage of 5 V is not less than 104? and not more than 109?.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: June 3, 2014
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Yoshihisa Mizumoto, Akihiko Kawatani, Takashi Marui, Kenichi Kuroda
  • Publication number: 20140113783
    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: Application
    Filed: August 1, 2013
    Publication date: April 24, 2014
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Yoshihisa MIZUMOTO, Takashi MARUI, Kenichi KURODA, Akihiko KAWATANI
  • Publication number: 20140099770
    Abstract: There is provided a technique for improving the flatness at the surface of members embedded in a plurality of recesses without resulting in an increase in the time required for the manufacturing processes. According to this technique, the dummy patterns can be placed up to the area near the boundary BL between the element forming region DA and dummy region FA by placing the first dummy pattern DP1 of relatively wider area and the second dummy pattern DP2 of relatively small area in the dummy region FA. Thereby, the flatness of the surface of the silicon oxide film embedded within the isolation groove can be improved over the entire part of the dummy region FA. Moreover, an increase of the mask data can be controlled when the first dummy patterns DP1 occupy a relatively wide region among the dummy region FA.
    Type: Application
    Filed: December 9, 2013
    Publication date: April 10, 2014
    Applicants: Hitachi ULSI Systems Co., Ltd., Renesas Electronics Corporation
    Inventors: Kenichi Kuroda, Kozo Watanabe, Hirohiko Yamamoto
  • Patent number: 8670700
    Abstract: A developing roller is provided, which is particularly used in an image forming apparatus of a highly durable design and is free from toner leakage even after formation of a predetermined number of images. Opposite end regions (5a) of an outer peripheral surface (5) of a roller body (2) of the developing roller (1) to be respectively kept in sliding contact with seal members each have a friction coefficient ? of not greater than 0.15.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: March 11, 2014
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Kenichi Kuroda, Akihiko Kawatani, Masakazu Tanaka, Yoshihisa Mizumoto
  • Publication number: 20140023411
    Abstract: A developing roller is provided which is capable of forming a toner layer having the most uniform possible thickness on an outer peripheral surface of a roller body thereof. The roller body (2) of the developing roller (1) is formed from a rubber composition comprising: a base rubber which is a mixture comprising NBR and/or SBR, CR and an epichlorohydrin rubber; and not less than 2.5 parts by mass and not greater than 15 parts by mass of a tackiness imparting agent based on 100 parts by mass of the base rubber.
    Type: Application
    Filed: June 18, 2013
    Publication date: January 23, 2014
    Inventors: Kenichi KURODA, Akihiko KAWATANI, Takashi MARUI