Patents by Inventor Keiichi Kitamura

Keiichi Kitamura 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).

  • Publication number: 20220310939
    Abstract: The present invention provides an organic photoelectric conversion material such that an increase in the solution viscosity can be suppressed even after long-term storage. This organic photoelectric conversion material comprises Pd, wherein the average number of Pd clusters in a scanning transmission electron microscopic image of a thin film made of the organic photoelectric conversion material is 1500 counts/?m3 or less. It is preferable that the Pd clusters each have a particle diameter of from 1 nm to 20 nm. It is preferable that the organic photoelectric conversion material is a polymer for organic photoelectric conversion material; and it is more preferable that the polymer for organic photoelectric conversion material is a D-A type n-conjugated polymer. It is preferable that the polymer for organic photoelectric conversion material has a thiophene ring.
    Type: Application
    Filed: August 20, 2020
    Publication date: September 29, 2022
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Yuta ISHINO, Tomoya KASHIKI, Shohei MATSUSHITA, Keiichi KITAMURA
  • Patent number: 9523518
    Abstract: A refrigeration cycle device includes a flow channel coupling member which constitutes at least one of a branching portion and a joining portion of a third refrigerant passage and a branching portion and a joining portion of a bypass passage. One of three refrigerant ports of the flow channel coupling member is directly connected to one of two refrigerant ports of a first switching device or a second switching device, and a sealing mechanism preventing a refrigerant leakage is provided in a connecting portion between the refrigerant port of the flow channel coupling member and the refrigerant port of the first switching device or the second switching device. The flow channel coupling member is fixed to one of the switching devices at a position different from a position of the sealing mechanism.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: December 20, 2016
    Assignees: DENSO CORPORATION, DENSO AIR SYSTEMS CORPORATION
    Inventors: Keiichi Kitamura, Shiho Hashimoto, Mitsuyoshi Tanaka, Junichi Ono
  • Publication number: 20150292780
    Abstract: A refrigeration cycle device includes a flow channel coupling member which constitutes at least one of a branching portion and a joining portion of a third refrigerant passage and a branching portion and a joining portion of a bypass passage. One of three refrigerant ports of the flow channel coupling member is directly connected to one of two refrigerant ports of a first switching device or a second switching device, and a sealing mechanism preventing a refrigerant leakage is provided in a connecting portion between the refrigerant port of the flow channel coupling member and the refrigerant port of the first switching device or the second switching device. The flow channel coupling member is fixed to one of the switching devices at a position different from a position of the sealing mechanism.
    Type: Application
    Filed: November 12, 2013
    Publication date: October 15, 2015
    Inventors: Keiichi Kitamura, Shiho Hashimoto, Mitsuyoshi Tanaka, Junichi Ono
  • Patent number: 8749204
    Abstract: A battery condition detector configured to detect a micro short circuit of a rechargeable battery is disclosed. The battery condition detector includes a processing part configured to calculate the remaining capacity and the full-charge capacity of a rechargeable battery 200 and to determine the micro short circuit of the rechargeable battery 200 by detecting an overcharge of the rechargeable battery 200 based on a charged capacity charged during the charging of the rechargeable battery 200, the remaining capacity calculated at a calculation time immediately before the start of the charging, and the full-charge capacity calculated before the start of the charging; and a communications part 70 configured to output a signal according to the determination result of the processing part 50.
    Type: Grant
    Filed: September 9, 2009
    Date of Patent: June 10, 2014
    Assignees: Mitsumi Electric Co., Ltd., NTT DoCoMo, Inc.
    Inventors: Yoshihide Majima, Keiichi Kitamura, Kazuhiko Takeno, Yasuyuki Kanai, Haruo Uemura
  • Publication number: 20110187329
    Abstract: A battery condition detector configured to detect a micro short circuit of a rechargeable battery is disclosed. The battery condition detector includes a processing part configured to calculate the remaining capacity and the full-charge capacity of a rechargeable battery 200 and to determine the micro short circuit of the rechargeable battery 200 by detecting an overcharge of the rechargeable battery 200 based on a charged capacity charged during the charging of the rechargeable battery 200, the remaining capacity calculated at a calculation time immediately before the start of the charging, and the full-charge capacity calculated before the start of the charging; and a communications part 70 configured to output a signal according to the determination result of the processing part 50.
    Type: Application
    Filed: September 9, 2009
    Publication date: August 4, 2011
    Applicants: MITSUMI ELECTRIC CO., LTD., NTT DOCOMO, INC.
    Inventors: Yoshihide Majima, Keiichi Kitamura, Kazuhiko Takeno, Yasuyuki Kanai, Haruo Uemura
  • Publication number: 20080302467
    Abstract: A pressure resistant vibration absorbing hose has a hose body including an inner surface rubber layer, a reinforcing layer and an outer surface rubber layer and a joint fitting including a rigid insert pipe and a socket fitting. The joint fitting is attached to a swaged portion of an axial end portion of the hose body by securely swaging the socket fitting thereto. The inner surface rubber layer is formed by molding such that a swaged portion thereof is larger than a main portion thereof in diameter and a wall thickness of the swaged portion is equal to or larger than a wall thickness of the main portion, and after that, the reinforcing layer and the outer surface rubber layer are laminated to construct the hose body.
    Type: Application
    Filed: July 11, 2008
    Publication date: December 11, 2008
    Applicants: Denso Corporation, Tokai Rubber Industries, Ltd.
    Inventors: Hajime Mukawa, Keiichi Kitamura, Tetsuya Arima, Norihiko Furuta, Ayumu Ikemoto
  • Publication number: 20080072987
    Abstract: A refrigerant transporting hose includes a tubular gas impermeable material layer on a base layer. The gas impermeable material layer is made of a base material composed of PVOH (polyvinyl alcohol), and nano-filler particles having plate shapes. The nano-filler particles are mixed in the base material so as to enhance the barrier properties against refrigerant gas of the gas impermeable material layer. For example, a ratio of the nano-filler to the base material, contained in the gas impermeable material layer, is higher than 0% and lower than 20% by weight.
    Type: Application
    Filed: September 25, 2007
    Publication date: March 27, 2008
    Applicant: DENSO Corporation
    Inventors: Hajime Mukawa, Keiichi Kitamura, Arata Iida
  • Patent number: 7121103
    Abstract: An automobile air conditioning system controls the high pressure of the refrigeration cycle in a wide range of airflows from a low airflow region during an intermediate period to a high airflow region. When a dehumidifying mode is selected, the target high pressure at which the cycle efficiency calculated from a gas cooler outlet refrigerant temperature is maximized is defined as a target value to a valve such as a heating variable throttle valve to control the high pressure of the refrigeration cycle to the target value. This permits control such that the cycle efficiency of the refrigeration cycle is maximized in a wide range of airflow from a low airflow region during an intermediate period to a high airflow region at a relatively low, about 10° C., outside air temperature.
    Type: Grant
    Filed: October 21, 2003
    Date of Patent: October 17, 2006
    Assignee: Denso Corporation
    Inventors: Satoshi Itoh, Toshinobu Homan, Keiichi Kitamura
  • Patent number: 7040117
    Abstract: In an ejector refrigerant cycle, even if refrigerant is super-heated in an evaporator, super-heated gas refrigerant does not directly flow into a gas-liquid separator, so that boiling of refrigerant does not occur in the gas-liquid separator due to evaporation of refrigerant in the gas-liquid separator. When an equivalent inner diameter (D) of a tank body of the gas-liquid separator is set in a range of 2 cm–6 cm, and when a ratio of a vertical dimension (H) of the tank body to the equivalent inner diameter (D) thereof is larger than 1, a wall thickness of the tank body can be reduced while gas-liquid separation performance in the gas-liquid separator can be improved.
    Type: Grant
    Filed: May 8, 2003
    Date of Patent: May 9, 2006
    Assignee: DENSO Corporation
    Inventors: Shin Nishida, Yoshitaka Tomatsu, Keiichi Kitamura
  • Publication number: 20060006645
    Abstract: A pressure resistant vibration absorbing hose has a hose body including an inner surface rubber layer, a reinforcing layer and an outer surface rubber layer and a joint fitting including a rigid insert pipe and a socket fitting. The joint fitting is attached to a swaged portion of an axial end portion of the hose body by securely swaging the socket fitting thereto. The inner surface rubber layer is formed by molding such that a swaged portion thereof is larger than a main portion thereof in diameter and a wall thickness of the swaged portion is equal to or larger than a wall thickness of the main portion, and after that, the reinforcing layer and the outer surface rubber layer are laminated to construct the hose body.
    Type: Application
    Filed: July 6, 2005
    Publication date: January 12, 2006
    Inventors: Hajime Mukawa, Keiichi Kitamura, Tetsuya Arima, Norihiko Furuta, Ayumu Ikemoto
  • Patent number: 6857286
    Abstract: A vapor-compression refrigerant cycle system includes a first evaporator in which refrigerant is evaporated, a second evaporator in which refrigerant is evaporated at a pressure lower than that in the first evaporator, and a switching device for switching between a first circulation where the refrigerant is circulated to the first evaporator and a second circulation where the refrigerant is circulated to the second evaporator. When the switching device switches to the second circulation from the first circulation, a refrigerant circulation into the second evaporator is stopped until the refrigerant pressure in the second evaporator becomes equal to or lower than a predetermined pressure. Therefore, the pressure in the second evaporator can be rapidly reduced. Further, when carbon dioxide is used as the refrigerant, the pressure in the second evaporator can be further rapidly reduced.
    Type: Grant
    Filed: December 15, 2003
    Date of Patent: February 22, 2005
    Assignee: DENSO Corporation
    Inventors: Hiromi Ohta, Motohiro Yamaguchi, Keiichi Kitamura
  • Publication number: 20040123624
    Abstract: A vapor-compression refrigerant cycle system includes a first evaporator in which refrigerant is evaporated, a second evaporator in which refrigerant is evaporated at a pressure lower than that in the first evaporator, and a switching device for switching between a first circulation where the refrigerant is circulated to the first evaporator and a second circulation where the refrigerant is circulated to the second evaporator. When the switching device switches to the second circulation from the first circulation, a refrigerant circulation into the second evaporator is stopped until the refrigerant pressure in the second evaporator becomes equal to or lower than a predetermined pressure. Therefore, the pressure in the second evaporator can be rapidly reduced. Further, when carbon dioxide is used as the refrigerant, the pressure in the second evaporator can be further rapidly reduced.
    Type: Application
    Filed: December 15, 2003
    Publication date: July 1, 2004
    Inventors: Hiromi Ohta, Motohiro Yamaguchi, Keiichi Kitamura
  • Publication number: 20040079096
    Abstract: An automobile air conditioning system controls the high pressure of the refrigeration cycle in a wide range of airflows from a low airflow region during an intermediate period to a high airflow region. When a dehumidifying mode is selected, the target high pressure at which the cycle efficiency calculated from a gas cooler outlet refrigerant temperature is maximized is defined as a target value to a valve such as a heating variable throttle valve to control the high pressure of the refrigeration cycle to the target value. This permits control such that the cycle efficiency of the refrigeration cycle is maximized in a wide range of airflow from a low airflow region during an intermediate period to a high airflow region at a relatively low, about 10° C., outside air temperature.
    Type: Application
    Filed: October 21, 2003
    Publication date: April 29, 2004
    Inventors: Satoshi Itoh, Toshinobu Homan, Keiichi Kitamura
  • Patent number: 6708512
    Abstract: In a vehicle air conditioner, a cold accumulator is disposed at a downstream air side of an evaporator to be cooled by cold air after passing through the evaporator. A cold accumulating material is sealed within the cold accumulator to be solidified while being cooled by the cold air from the evaporator. The cold accumulating material is a mixture of plural kinds of paraffin materials having different melting points, equal to or more than two. The plural kinds of the paraffin materials are mixed, so that the cold accumulating material having a melting point in a range of 7-11° C. can be obtained. In this case, cooling function in the cold accumulator can be improved.
    Type: Grant
    Filed: September 12, 2002
    Date of Patent: March 23, 2004
    Assignee: Denso Corporation
    Inventors: Keiichi Kitamura, Yuichi Shirota, Koji Takahashi
  • Publication number: 20030209030
    Abstract: In an ejector refrigerant cycle, even if refrigerant is super-heated in an evaporator, super-heated gas refrigerant does not directly flow into a gas-liquid separator, so that boiling of refrigerant does not occur in the gas-liquid separator due to evaporation of refrigerant in the gas-liquid separator. When an equivalent inner diameter (D) of a tank body of the gas-liquid separator is set in a range of 2 cm-6 cm, and when a ratio of a vertical dimension (H) of the tank body to the equivalent inner diameter (D) thereof is larger than 1, a wall thickness of the tank body can be reduced while gas-liquid separation performance in the gas-liquid separator can be improved.
    Type: Application
    Filed: May 8, 2003
    Publication date: November 13, 2003
    Inventors: Shin Nishida, Yoshitaka Tomatsu, Keiichi Kitamura
  • Patent number: 6640568
    Abstract: In a vehicle air conditioner, a temperature sensor is disposed on a tank of an evaporator to contact the tank. In addition, the temperature sensor is disposed at a tank position separated from a refrigerant inlet and a refrigerant outlet. Accordingly, a downstream space of the evaporator can be effectively used, and the size of the air conditioner can be reduced while the temperature of the evaporator can be accurately detected using the temperature sensor.
    Type: Grant
    Filed: August 21, 2002
    Date of Patent: November 4, 2003
    Assignee: Denso Corporation
    Inventors: Yuichi Shirota, Koji Takahashi, Keiichi Kitamura
  • Publication number: 20030046944
    Abstract: In a vehicle air conditioner, a cold accumulator is disposed at a downstream air side of an evaporator to be cooled by cold air after passing through the evaporator. A cold accumulating material is sealed within the cold accumulator to be solidified while being cooled by the cold air from the evaporator. The cold accumulating material is a mixture of plural kinds of paraffin materials having different melting points, equal to or more than two. The plural kinds of the paraffin materials are mixed, so that the cold accumulating material having a melting point in a range of 7-11° C. can be obtained. In this case, cooling function in the cold accumulator can be improved.
    Type: Application
    Filed: September 12, 2002
    Publication date: March 13, 2003
    Inventors: Keiichi Kitamura, Yuichi Shirota, Koji Takahashi
  • Patent number: 6530239
    Abstract: A refrigeration system which can reduce the amount of moisture permeating into the system, inexpensively and by a simple structure, is disclosed. Rubber hoses (7, 8) capable of absorbing vibrations are arranged on the discharge and the intake sides of a compressor (1). It was found that the amount of moisture in the system can be effectively reduced by reducing the amount of moisture permeating the rubber hose on the discharge side. A freezing limit line is set for defining to a predetermined level the amount of moisture in the system determined by the amount of the refrigerant sealed in the system, the amount of the lubricating oil sealed in the system, the amount of moisture permeation of the hoses (7, 8) and the number of the years elapsed after operation start. The hose (7) on the discharge side of the compressor has a smaller amount of moisture permeation than the hose (8) on the intake side.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: March 11, 2003
    Assignee: Denso Corporation
    Inventors: Tetsuji Nobuta, Keiichi Kitamura
  • Publication number: 20030041610
    Abstract: In a vehicle air conditioner, a temperature sensor is disposed on a tank of an evaporator to contact the tank. In addition, the temperature sensor is disposed at a tank position separated from a refrigerant inlet and a refrigerant outlet. Accordingly, a downstream space of the evaporator can be effectively used, and the size of the air conditioner can be reduced while the temperature of the evaporator can be accurately detected using the temperature sensor.
    Type: Application
    Filed: August 21, 2002
    Publication date: March 6, 2003
    Inventors: Yuichi Shirota, Koji Takahashi, Keiichi Kitamura
  • Publication number: 20020157722
    Abstract: A refrigerant transporting hose has a five-layered wall formed of an inner rubber layer, a middle rubber layer, an outer rubber layer, a first reinforcing layer formed between the inner and middle rubber layers and a second reinforcing layer formed between the middle and outer rubber layers. Each rubber layer has a thickness of at least 0.3 mm. Each reinforcing layer is a single layer of spirally wound reinforcing yarn, and the two reinforcing layers have substantially opposite spiral yarn directions. The hose having no resin layer in its wall is of improved flexibility, as well as retaining satisfactory pressure resistance, fluid impermeability and kink resistance.
    Type: Application
    Filed: February 22, 2002
    Publication date: October 31, 2002
    Inventors: Tetsuya Arima, Masanobu Onishi, Keiichi Kitamura, Makoto Yoshino