Patents by Inventor Naoki Yokoyama

Naoki Yokoyama 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: 7320229
    Abstract: A branch passage, which is branched at a point on an upstream side of an ejector, is connected to a refrigerant suction inlet of the ejector. An evaporator is arranged in the branch passage, and a capillary tube is arranged on an upstream side of the evaporator.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: January 22, 2008
    Assignee: DENSO Corporation
    Inventors: Hiroshi Oshitani, Hirotsugu Takeuchi, Haruyuki Nishijima, Makoto Ikegami, Naoki Yokoyama
  • Publication number: 20070271942
    Abstract: An object of the invention is to effectively defrost multiple a vaporizing devices provided in an ejector cycle. In one of the embodiments, electric heating devices are provided for the respective first and second vaporizing devices, to carry out defrosting operations for each vaporizing device. In addition, a defrosting operation is carried out for the second vaporizing device by hot-gas from a compressor.
    Type: Application
    Filed: May 22, 2007
    Publication date: November 29, 2007
    Applicant: DENSO Corporation
    Inventors: Naoki Yokoyama, Hirotsugu Takeuchi, Makoto Ikegami, Yasuhiro Yamamoto
  • Patent number: 7290388
    Abstract: A motorcycle exhaust system includes a catalytic converter (43) disposed within an exhaust passage (37) for discharging exhaust gas (G) from a multi-cylinder combustion engine (E) and operable to purify the exhaust gas (G). An upstream end of the catalytic converter (43) has different regions (S1 and S2) communicated with upstream exhaust passage portions (37a and 37a), respectively, and a downstream end of the catalytic converter (43) is communicated with downstream exhaust passage portions (37b and 37b) in a number equal to or smaller than the number of the upstream exhaust passage portions (37a and 37a). Also, the catalytic converter (43) has a partition wall (43c) extending in a direction of flow of the exhaust gas (G) for allowing the exhaust gas (G) from the upstream exhaust passage portions (37a and 37a) to flow through the catalytic converter (43) without being mixed together.
    Type: Grant
    Filed: September 9, 2005
    Date of Patent: November 6, 2007
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha
    Inventors: Hiroyuki Kikuchi, Hidehiko Yamamoto, Yoji Onishi, Naoki Yokoyama
  • Publication number: 20070137189
    Abstract: In a vehicle exhaust apparatus constituting an exhaust passage to an exhaust muffler from a plurality of exhaust pipes connected to a multi-cylinder engine, an expansion chamber is formed on the way of the exhaust passage and is connected to an exhaust collector portion. The expansion chamber is formed so as to expand outward from the exhaust collector portion in a substantially arc or chevron shape when viewed from a direction substantially orthogonal to an exhaust gasflow. Preferably, the expansion chamber is formed in a spherical shape and plural branched exhaust pipes are formed on the exhaust gas downstream side of the expansion chamber.
    Type: Application
    Filed: December 14, 2006
    Publication date: June 21, 2007
    Inventors: Hiroyuki Kikuchi, Naoki Yokoyama
  • Publication number: 20070028646
    Abstract: A branch passage, which is branched at a point on an upstream side of an ejector, is connected to a refrigerant suction inlet of the ejector. An evaporator is arranged in the branch passage, and a capillary tube is arranged on an upstream side of the evaporator.
    Type: Application
    Filed: July 31, 2006
    Publication date: February 8, 2007
    Applicant: DENSO Corporation
    Inventors: Hiroshi Oshitani, Hirotsugu Takeuchi, Haruyuki Nishijima, Makoto Ikegami, Naoki Yokoyama
  • Publication number: 20060254308
    Abstract: In an ejector cycle device having an ejector, an evaporator is arranged in a refrigerant branch passage connected to a refrigerant suction port of the ejector, an opening/closing member for opening and closing a refrigerant passage is disposed to prevent refrigerant from flowing into the evaporator, and a control unit intermittently controls operation of the compressor. In the ejector cycle device, the control unit brings the opening/closing member into a closing state in a time period for which the operation of the compressor is stopped. Accordingly, it can restrict liquid refrigerant from collecting in the evaporator while the compressor is stopped.
    Type: Application
    Filed: May 15, 2006
    Publication date: November 16, 2006
    Applicant: DENSO Corporation
    Inventors: Naoki Yokoyama, Hiroshi Oshitani, Hirotsugu Takeuchi, Haruyuki Nishijima, Makoto Ikegami, Takuo Maehara, Etsuhisa Yamada
  • Publication number: 20060053780
    Abstract: A motorcycle exhaust system includes a catalytic converter (43) disposed within an exhaust passage (37) for discharging exhaust gas (G) from a multi-cylinder combustion engine (E) and operable to purify the exhaust gas (G). An upstream end of the catalytic converter (43) has different regions (S1 and S2) communicated with upstream exhaust passage portions (37a and 37a), respectively, and a downstream end of the catalytic converter (43) is communicated with downstream exhaust passage portions (37b and 37b) in a number equal to or smaller than the number of the upstream exhaust passage portions (37a and 37a). Also, the catalytic converter (43) has a partition wall (43c) extending in a direction of flow of the exhaust gas (G) for allowing the exhaust gas (G) from the upstream exhaust passage portions (37a and 37a) to flow through the catalytic converter (43) without being mixed together.
    Type: Application
    Filed: September 9, 2005
    Publication date: March 16, 2006
    Inventors: Hiroyuki Kikuchi, Hidehiko Yamamoto, Yoji Onishi, Naoki Yokoyama
  • Patent number: 6947739
    Abstract: A subscriber wireless access system equipped with customer stations wirelessly connected to base stations and accommodating communication terminal devices in the customer stations. The system is provided with at least one exchange for connecting the base stations with a virtual dedicated line network for enabling customer stations wirelessly connected to different base stations to be interconnected via a virtual dedicated line network. The exchange includes table information assigned to the customer stations with virtual network connection information allocated for connected the customer stations, means responsive to receipt of data from a customer station via a subordinate base station for, with reference to the table, sending the data through the virtual network to another base station, and means responsive to receipt of data through the virtual network for, with reference to the table, converting the data to customer station identification information and sending the data to a subordinate base station.
    Type: Grant
    Filed: December 27, 2001
    Date of Patent: September 20, 2005
    Assignee: Hitachi Kokusai Electric Inc.
    Inventor: Naoki Yokoyama
  • Patent number: 6826166
    Abstract: There is disclosed a wireless access system in which subscriber registration, deletion, and the like are set in a pertinent wireless base station in accordance with a request from a management center, and remote maintenance is realized. The management center is provided with an SNMP manager, each wireless base station is provided with an SNMP agent, and an SNMP protocol is used to set information of subscriber new registration, registration deletion, operation stop, and operation restart in a subscriber management information table for use in communication permission in accordance with SET request in the wireless access system.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: November 30, 2004
    Assignee: Hitachi Kokusai Electric Inc.
    Inventor: Naoki Yokoyama
  • Patent number: 6775998
    Abstract: Respective evaporators are set to a proper value in evaporation temperature and the efficiency in refrigeration cycle is enhanced, resulting in a reduction of energy consumption. A refrigerating unit and a refrigerator comprise a compressor, a condenser, a plurality of evaporators connected in series, a refrigerant flow rate adjustable unit and a refrigerant, thereby constituting a refrigeration cycle. The refrigerant flow rate adjustable unit controls each respective evaporation temperature of the plurality of evaporators. Preferably, the refrigeration unit further comprises a bypass circuit bypassing at least one of the plurality of evaporators and, when needs arise, the refrigerant is channeled through the bypass circuit.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: August 17, 2004
    Assignee: Matsushita Refrigeration Company
    Inventors: Masashi Yuasa, Shuzo Kamimura, Hiroshi Yamada, Hideki Fukui, Yasuki Hamano, Naoki Yokoyama
  • Publication number: 20040050083
    Abstract: Respective evaporators are set to a proper value in evaporation temperature and the efficiency in refrigeration cycle is enhanced, resulting in a reduction of energy consumption. A refrigerating unit and a refrigerator comprise a compressor, a condenser, a plurality of evaporators connected in series, a refrigerant flow rate adjustable unit and a refrigerant, thereby constituting a refrigeration cycle. The refrigerant flow rate adjustable unit controls each respective evaporation temperature of the plurality of evaporators. Preferably, the refrigeration unit further comprises a bypass circuit bypassing at least one of the plurality of evaporators and, when needs arise, the refrigerant is channeled through the bypass circuit.
    Type: Application
    Filed: October 17, 2003
    Publication date: March 18, 2004
    Inventors: Masashi Yuasa, Shuzo Kamimura, Hiroshi Yamada, Hideki Fukui, Yasuki Hamano, Naoki Yokoyama
  • Patent number: 6522301
    Abstract: An above deck unit for an AIS (automatic identification system) is externally installed on a ship. The above deck unit includes a radio circuit and an associated antenna for transmitting and receiving a message, a position detector and an associated antenna, associated controller and power supply, and a container for storing these elements. An inboard transmission path, e.g., a cable, connects the outdoor unit for the AIS and an AIS display serving as an interface means for the crew. A signal to be transmitted through the inboard transmission path is a processed, for example, an amplified signal, rather than an unprocessed output of a VHF antenna. Therefore, problems of signal loss or degradation along the inboard transmission path are unlikely to occur. Because the unit is incorporated within a single container, it can easily be installed and transferred. With this antenna complex, it is also possible to suppress interference between antennas.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: February 18, 2003
    Assignee: Japan Radio Co., Ltd.
    Inventors: Masaki Takayama, Naoki Yokoyama, Masanori Haga, Naohisa Goto
  • Publication number: 20020086705
    Abstract: A subscriber wireless access system equipped with customer stations wirelessly connected to base stations and accommodating communication terminal devices in the customer stations is provided which has at least one exchange for connecting the base stations with a virtual dedicated line network for enabling customer stations wirelessly connected to different base stations to be interconnected via a virtual dedicated line network.
    Type: Application
    Filed: December 27, 2001
    Publication date: July 4, 2002
    Inventor: Naoki Yokoyama
  • Publication number: 20020081986
    Abstract: Since a pair of units associated with an antenna unit and a base processing unit is separately placed at a various distance with each other, communication signals also attenuate at a various rate. The amplification gain is adjusted at one unit based upon a receiving signal and a predetermined reception sensitivity level until a desirable amplification is achieved. The desirable amplification value is then transmitted to the other unit to be utilized for reciprocal communication at a desired level between the two units.
    Type: Application
    Filed: December 14, 2001
    Publication date: June 27, 2002
    Inventor: Naoki Yokoyama
  • Patent number: 6407783
    Abstract: A liquid crystal display device has a light shielding layer 21 at a portion excluding a display pattern on a transparent substrate 12 wherein material for the light shielding layer has an electrical insulation property of not less than 1012 &OHgr;/□ in terms of insulation resistance and an optical density (OD value) of not less than 2.0 per a film thickness of 1 &mgr;m.
    Type: Grant
    Filed: April 6, 1999
    Date of Patent: June 18, 2002
    Assignees: Optrex Corporation, Hiroshima Opt Corporation, Nippon Steel Chemical Co., Ltd.
    Inventors: Masao Ohgawara, Shinsuke Iguchi, Masanori Kohno, Takero Teramoto, Naoki Yokoyama, Kizo Hattori
  • Publication number: 20020050952
    Abstract: An above deck unit for an AIS (automatic identification system) is externally installed on a ship. The above deck unit includes a radio circuit and an associated antenna for transmitting and receiving a message, a position detector and an associated antenna, associated controller and power supply, and a container for storing these elements. An inboard transmission path, e.g., a cable, connects the outdoor unit for the AIS and an AIS display serving as an interface means for the crew. A signal to be transmitted through the inboard transmission path is a processed, for example, an amplified signal, rather than an unprocessed output of a VHF antenna. Therefore, problems of signal loss or degradation along the inboard transmission path are unlikely to occur. Because the unit is incorporated within a single container, it can easily be installed and transferred. With this antenna complex, it is also possible to suppress interference between antennas.
    Type: Application
    Filed: October 5, 2001
    Publication date: May 2, 2002
    Inventors: Masaki Takayama, Naoki Yokoyama, Masanori Haga, Naohisa Goto
  • Publication number: 20020034962
    Abstract: Subscriber station IDs added to subscriber station devices, and pieces of subscriber group number information representing the same group are added to the subscriber station devices to group the subscriber station devices. A base station apparatus holds a corresponding table between subscriber station IDs and subscriber group numbers and designates broadcast data received from a subscriber station device such that a subscriber station device belonging to the same group as that of a subscriber station device of a transmission source as a destination to forward the broadcast data to a wireless area. The table can be updated by an SNMP manager device connected through a communication network WAN.
    Type: Application
    Filed: September 4, 2001
    Publication date: March 21, 2002
    Inventor: Naoki Yokoyama
  • Publication number: 20020018455
    Abstract: There is disclosed a wireless access system in which subscriber registration, deletion, and the like are set in a pertinent wireless base station in accordance with a request from a management center, and remote maintenance is realized. The management center is provided with an SNMP manager, each wireless base station is provided with an SNMP agent, and an SNMP protocol is used to set information of subscriber new registration, registration deletion, operation stop, and operation restart in a subscriber management information table for use in communication permission in accordance with SET request in the wireless access system.
    Type: Application
    Filed: December 11, 2000
    Publication date: February 14, 2002
    Inventor: Naoki Yokoyama
  • Patent number: 5938858
    Abstract: A cleaning method for a video tape recorder (VTR) employs a cleaning liquid. The cleaning liquid is applied to a tape surface of a tape-shaped support. The tape surface then slides against a surface of a VTR component, such as a magnetic head surface, to clean the surface. The cleaning liquid is a mixture of perfluorocarbons having a boiling point of about 56.degree. C. to about 155.degree. C. The cleaning liquid may also contain a hydrocarbon based solvent and a fluorine based resin. The cleaning liquid acts to clean and to prevent redeposition of contaminants on the surface of VTR component.
    Type: Grant
    Filed: February 11, 1998
    Date of Patent: August 17, 1999
    Assignees: Sony Corporation, Taiseishokai Co. Ltd.
    Inventors: Naoki Yokoyama, Taiichiro Yoshimoto
  • Patent number: 5889296
    Abstract: A photodetection device includes a collector layer, a collector electrode connected electrically to the collector layer, a base layer free from a junction region for contacting with an electrode, an emitter layer including at least two, mutually separated emitter regions; and at least two emitter electrodes provided respectively on the emitter regions, wherein the base layer is exposed optically to an external optical radiation.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: March 30, 1999
    Assignee: Fujitsu Limited
    Inventors: Kenichi Imamura, Naoki Yokoyama