Patents by Inventor Yoichi Nakamura

Yoichi Nakamura 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: 6225016
    Abstract: A photoconductor for electrophotography includes a photosensitive film containing a bisazo charge generation agent described by structural formula (I) and from 100 nmol to 40 mmol, preferably from 500 nmol to 20 mmol, of a compound described by a structural formula (II) with respect to 1 mol of the bisazo charge generation agent. Such a photoconductor for electrophotography minimizes visual defects and image nonuniformity.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: May 1, 2001
    Assignee: Fuji Electric Imaging Device Co., Ltd.
    Inventors: Teruo Sasaki, Yoichi Nakamura
  • Patent number: 6200714
    Abstract: An electrophotographic photoconductor includes a phosphinate additive in a photosensitive film that improves the stability of the coating liquid for the photosensitive film. The electrophotographic photoconductor includes an electrically conductive substrate and a photosensitive film on the substrate. The photosensitive film contains a charge generation agent and a phosphinate compound. The photoconductor may be of either a monolayer or a laminate construction. In the case of a laminate type photoconductor, the phosphinate compound is incorporated into the charge transport layer. A method of making an electrophotographic photoconductor adds a phosphinate additive to the coating liquid for a photosensitive film to improve stability of the coating liquid. The method involves producing a coating liquid containing a phosphinate compound and coating a conductive substrate with the coating liquid to form a photosensitive film.
    Type: Grant
    Filed: December 1, 1999
    Date of Patent: March 13, 2001
    Assignee: Fuji Electric Imaging Device Co., Ltd.
    Inventors: Yoichi Nakamura, Teruo Sasaki, Kenichi Hara, Hideki Kina, Akira Ootani
  • Patent number: 6168893
    Abstract: There is provided an electrophotographic photoconductor whose stability has been improved by incorporating an aryloxydiarylphosphine compound into a layer having a charge transport material. There is also provided a method for producing an electrophotographic photoconductor, which can improve the stability of a coating liquid for formation of a photosensitive layer by incorporating the aryloxydiarylphosphine compound into the coating liquid.
    Type: Grant
    Filed: November 4, 1999
    Date of Patent: January 2, 2001
    Assignee: Fuji Electric Imaging Device Co., Ltd.
    Inventors: Yoichi Nakamura, Shinjirou Suzuki, Hideki Kina, Akira Ootani
  • Patent number: 6150064
    Abstract: A photoconductor for electrophotography includes a photoconductive layer that contains titanyloxyphthalocyanine as a charge generation agent. The concentration of SO.sub.4.sup.2- with respect to the concentration of titanyloxyphthalocyanine is adjusted to be less than or equal to 500 ppm. The photoconductor may be of either a monolayer or a laminate construction. In the case of a laminate type photoconductor, the titanyloxyphthalocyanine is incorporated into the charge generation layer.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: November 21, 2000
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Kazumi Egota, Yoichi Nakamura, Masahide Takano, Hideki Kina, Akira Ootani
  • Patent number: 6138733
    Abstract: A bead portion durability of a pneumatic radial tire for large-size vehicle is improved by disposing a combination of a first protection rubber layer A having a 100% modulus of 25-40 kgf/cm.sup.2 and a second protection rubber layer B having a 100% modulus of 30-50 kgf/cm.sup.2 in given places of the bead portion so as to locate an inner end of the first protection rubber layer A in the radial direction of the tire between an outer end of a curved face of the bead heel in the radial direction and an end of a curved face of a rim flange and locate an outer end of the second protection rubber layer B in the radial direction of the tire at such a position outward in the radial direction of the tire that an inclination angle defined between a line segment connecting this end to a curvature center of the curved face of the rim flange and a phantom line passing through the curvature center and in parallel to a rotating axis of the tire is not less than 20.degree..
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: October 31, 2000
    Assignee: Bridgestone Corporation
    Inventor: Yoichi Nakamura
  • Patent number: 6001520
    Abstract: An electrophotographic photosensitive body has a charge generating layer and a charge transporting layer on a conductive substrate. The charge transporting layer contains a zinc carboxylate compound expressed by the following General Formula (I):(Ar--COO.sup.-)(R--COO.sup.-)Zn.sup.2+ [I]wherein:Ar is a substituted or unsubstituted aryl group andR is a substituted or unsubstituted alkenyl groupA method for the manufacture of the electrophotographic photosensitive body is also disclosed.
    Type: Grant
    Filed: January 27, 1999
    Date of Patent: December 14, 1999
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Yoichi Nakamura, Motohiro Takeshima, Akira Ootani, Osamu Nabeta
  • Patent number: 5948580
    Abstract: An electrophotographic photoconductor having an electrically conductive substrate and a photosensitive layer formed on the conductive substrate is provided wherein the photosensitive layer comprises a layer that contains titanyl oxyphthalocyanine as a photoconductive material, and alkyl polyol that is diol or higher polyol and has hydroxyl groups for every three carbon atoms in a main chain of the alkyl polyol. The content of the alkyl polyol is controlled such that the amount of the hydroxyl groups of the alkyl polyol is in a range of 0.1 mol to 100 mol per 1 mol of titanyl oxyphthalocyanine. A method of manufacturing this electrophotographic photoconductor is also disclosed.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: September 7, 1999
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Yoichi Nakamura, Kazumi Egota, Masahide Takano, Hideki Kina, Akira Ootani
  • Patent number: 5945243
    Abstract: An electrophotographic photoconductor includes a conductive substrate having a photoconductive film thereon. The photoconductive film includes a layer containing a charge transport agent and a phosphonite compound, which acts as an antioxidant. Preferably, the phosphonite compound is diarylarylphosphonite. The layer that contains the charge transport preferably contains from 0.005 to 10 weight % of diarylarylphosphonite. The diarylarylphosphonite is preferably a compound selected from the group consisting of bis(2,4-di-tert-butylphenyl)phenylphosphonite, bis(2,6-di-tert-butylphenyl)phenylphosphonite and bis(2,6-di-tert-butyl-4-methylphenyl)phenylphosphonite.
    Type: Grant
    Filed: June 19, 1998
    Date of Patent: August 31, 1999
    Assignee: Fuji Electric Co., Ltd
    Inventors: Yoichi Nakamura, Kazumi Egota, Seizo Kitagawa, Naoki Itoh
  • Patent number: 5905009
    Abstract: A charge generation material for an electrophotographic photoconductor includes a titanyloxyphthalocyanine molecular aggregate. The titanyloxyphthalocyanine molecular aggregate contains between 0.006 to 1.000 water molecules per titanyloxyphthalocyanine molecule. The titanyloxyphthalocyanine molecular aggregate exhibits an X-ray diffraction spectrum, measured using CuK.alpha. radiation, having clear peaks at angles of 7.2.degree., 9.6.degree., 11.6.degree., 13.4.degree., 14.9.degree., 18.3.degree., 23.6.degree., 24.1.degree. and 27.3.degree., the peak at 9.6.degree. being the highest, the spectrum lacking a peak at 26.3.degree., and the angles being 2 .theta..+-.0.2.degree., where .theta. is a diffraction angle. A function-separation-type electrophotographic photoconductor includes the titanyloxyphthalocyanine molecular aggregate of the present invention in the charge generation layer.
    Type: Grant
    Filed: October 8, 1997
    Date of Patent: May 18, 1999
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Yoichi Nakamura, Kazumi Egota, Toshio Tsubota, Makoto Miyazawa
  • Patent number: 5876889
    Abstract: An electrophotographic photoconductor has a conductive substrate and a photosensitive layer. The photosensitive layer is laminated on the conductive substrate and includes at least phthalocyanine compound as a photoconductive material. In the photosensitive layer, the content of o-phthalonitrile polymer except the phthalocyanine compound is in a range of 100 nmol to 200 mmol with respect to 1 mol of the phthalocyanine compound. Thus, the electrophotographic photoconductor has an excellent surface-charge retention.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: March 2, 1999
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Yoichi Nakamura, Kazumi Egota, Koji Kawaguchi, Yoshimasa Hattori
  • Patent number: 5837410
    Abstract: A photoconductor for electrophotography includes a conductive substrate and an organic film comprised of one or more layers which contain one or more organic compounds. The water content of the organic film is regulated to be within 0.02 to 5.0 weight percent with respect to the total weight of the organic film by exposing the photoconductor to an atmosphere of controlled temperature and humidity during fabrication of the photoconductor. By exposing the photoconductor to the controlled atmosphere, consistency in photoconductive properties is realized from one photoconductor to another.
    Type: Grant
    Filed: September 19, 1996
    Date of Patent: November 17, 1998
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Yoichi Nakamura, Shinichiro Nishimaki
  • Patent number: 5797040
    Abstract: A data transmission system is provided in a computer system including at least one processing unit for processing data and at least one adapter for controlling a device coupled thereto, the processing unit and the adapter being coupled to each other by a bus, in which after information is forwarded to the bus from the processing unit or the adapter which has acquired use of the bus, the bus is released from the processing unit or the adapter. The data transmission system includes a plurality of buffers, provided in the adapter, for storing data to be transmitted to the processing unit, and a plurality of buffer control sequencers each of which are coupled to one of the plurality of buffers, each of the plurality of buffer control sequencers controlling transmission of data stored in a corresponding one of the plurality of buffers when use of the bus is granted to the relevant one of the plurality of buffer control sequencers in response to a request for permission to transmit data.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: August 18, 1998
    Assignee: Fujitsu Limited
    Inventor: Yoichi Nakamura
  • Patent number: 5781448
    Abstract: Amount of alternating current power is calculated using measuring units for alternating current voltage and alternating current. Value of direct current is calculated using the calculated alternating current power and an efficiency table. An initial life time of a battery is predicted using the calculated direct current value and a battery life time table. Life time corresponding to an actual consumed amount is repeatedly updated using a detected direct current value and an updated life time.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: July 14, 1998
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Apricot Computers Limited
    Inventors: Yoichi Nakamura, Takashi Saito, Phil Coldwell, Nigel Hart
  • Patent number: 5583987
    Abstract: A symmetric multiprocessor system connecting a plurality of CPUs by a common bus initializes itself while defective CPUs are set aside to use only the remaining CPUs when the power is turned on, thereby maintaining the predetermined CPU numbers and giving a minimum influence with the existing software thereof. The multiprocessor system includes an identifier setting register to designate in a predetermined order the CPU numbers only to normal CPUs, and a reset controller to cut off the defective CPUs from the common bus. The multiprocessor system can automatically start re-setting up where the defective CPUs are detected during the processing of setting-up based on the time-out detection, can release an abnormal state of the hardware, and can control the setting-up processing in use of any CPU based on the level of a reset status input port and contents of a reset information register.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: December 10, 1996
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Apricot Computers Limited
    Inventors: Satoshi Kobayashi, Toshikazu Yokoi, Kunio Takahari, Yoichi Nakamura, Junichi Ishikawa, Nigel Bruce, David Wright, Colin Hough
  • Patent number: 5579981
    Abstract: A reflow apparatus includes a reflow furnace. A transfer device holds and transfers printed circuit boards with to-be-reflowed electronic components thereon from an inlet to an outlet of the furnace within the furnace. A plurality of adjusting/circulating sections separate an ambient gas for heating the printed circuit boards into predetermined temperature regions in the furnace in which the ambient gas is circulated in a heated state. A feed port is formed in the furnace to feed the ambient gas into the furnace under pressure. Residence parts each provided between adjacent adjusting/circulating sections regulate the amount of the ambient gas when the ambient gas, after having been sent to and heated in the adjusting/circulating section adjacent to the feed port, is circulated and sequentially moved to the adjusting/circulating sections at the inlet or the outlet and finally flows out through the inlet or outlet into atmosphere.
    Type: Grant
    Filed: January 12, 1995
    Date of Patent: December 3, 1996
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Nobuya Matsumura, Kazumi Ishimoto, Yoichi Nakamura, Kurayasu Hamasaki, Kimihito Kuwabara, Masahiro Taniguchi
  • Patent number: 5478684
    Abstract: A photoconductor for electrophotography is formed of photoconductive material, which includes a substrate, and laminated layers formed on the substrate. The laminated layers includes a charge generation layer and a charge transport layer. The charge generation layer is a film formed by applying to the substrate a coating liquid containing a charge generation material, a resin binder and a stabilizer, and heating and hardening the coated liquid at 120.degree. C. or lower. The photoconductor has good electric characteristics, particularly a low residual potential.
    Type: Grant
    Filed: July 14, 1994
    Date of Patent: December 26, 1995
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Yoichi Nakamura, Kimio Kurosawa
  • Patent number: 5407767
    Abstract: A photoconductor for electrophotography comprises an electroconductive substrate and a photosensitive layer formed on the conductive substrate and including a charge generating material and a charge transporting material. The charge transporting material comprises at least one compound selected from indole compounds represented by the following general formula (I) and at least one compound selected from benzidine compounds represented by the following general formula (II).
    Type: Grant
    Filed: February 7, 1994
    Date of Patent: April 18, 1995
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Sumitaka Nogami, Yoichi Nakamura, Nobuyoshi Mori
  • Patent number: 5405725
    Abstract: An electrophotographic photoconductor for an electrophotographic apparatus which employs contact charging, includes a conductive substrate; and a photoconductive layer for contacting an electric conductor, which photoconductive layer includes a charge generating layer which is formed on the conductive substrate and which comprises a binder and a charge generating agent comprised of particles of phthalocyanine pigment or 4,10-dibromoanthanthrone pigment dispersed in the binder; and a charge transporting layer which is formed on the charge generating layer, wherein the particles of pigment have a major axis which does not exceed 1000 nm and a minor axis which is not less than 10 nm, and wherein the particles of pigment have a ratio of the major axis to the minor axis which does not exceed 3. Alternativly, the charge transporting layer is formed on the conductive substrate and the charge generating layer is formed on the charge transporting layer.
    Type: Grant
    Filed: October 7, 1992
    Date of Patent: April 11, 1995
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Yoichi Nakamura, Sumitaka Nogami, Hideki Komiyama
  • Patent number: 5393627
    Abstract: The photoconductor for electrophotography comprises an electroconductive substrate and a photosensitive layer formed on the substrate. The photosensitive layer may be a monolayer or function-separated laminate type one which comprise a charge generating layer and a charge transporting layer laminated one on another. The charge transporting layer contains a specified diamine compound represented by general formula (I) below as the charge transporting substance. ##STR1## wherein R.sub.1 and R.sub.2, which are the same or different, each represent independently an alkyl group, an alkoxy group, or a halogen atom; R.sub.3, R.sub.4, R.sub.5 and R.sub.6, which are the same or different, each represent independently an aryl group or an alkyl group, or R.sub.3 and R.sub.4, or R.sub.5 and R.sub.6, combine and form a condensed aromatic ring; and X represents an oxygen atom, a sulfur atom, a carbonyl group, or a sulfonyl group.
    Type: Grant
    Filed: February 1, 1993
    Date of Patent: February 28, 1995
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Yoichi Nakamura, Nobuyoshi Mori, Sumitaka Nogami
  • Patent number: 5388013
    Abstract: A record storage format conversion method and a system which is capable of mitigating a load imposed on the memory by decreasing the number of accesses to the memory for finding out a CKD record of concern upon format conversion of the CKD records into FBA records while allowing the capacity of a memory required for holding the track data to be decreased. All gaps inclusive of inter-record gaps and inter-field gaps are deleted from variable length records of one track recorded in a variable length format employed in an external storage device of a general-purpose computer. The track data thus obtained is divided into management units each of a predetermined size corresponding to an integral multiple of the size of the fixed length block of the fixed length record.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: February 7, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Yoichi Nakamura