Patents by Inventor Hitoshi Ishikawa

Hitoshi Ishikawa 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: 20030018602
    Abstract: Methods of representing knowledge data in a computer which is used for accumulating worker knowledge, an information processing system and a program are disclosed, wherein the knowledge of a worker is represented as at least one of an input information given to the computer and processing information executed by the computer. The information obtained is represented as output information and respective pieces of information are readably accumulated in association with one another by the computer. With the methods, the knowledge data is made easy for the worker to understand, and it is also made easy to prepare, understand and revise the knowledge data.
    Type: Application
    Filed: July 8, 2002
    Publication date: January 23, 2003
    Applicant: TOYOTA CAELUM INCORPORATED
    Inventors: Motomasa Kawai, Hideho Ariyoshi, Hitoshi Ishikawa, Masanori Ogawa
  • Publication number: 20020180348
    Abstract: This invention provides organic electroluminescent devices in which a diffraction grating is formed as a constituent element thereof on the reflecting surface of the cathode or on the light output side, resulting in an improvement in light output efficiency.
    Type: Application
    Filed: March 24, 1999
    Publication date: December 5, 2002
    Inventors: ATSUSHI ODA, HITOSHI ISHIKAWA, SATORU TOGUCHI
  • Publication number: 20020168543
    Abstract: An object of the present invention is to provide a blue-light emitting organic EL device having excellent color purity and high brightness.
    Type: Application
    Filed: October 21, 1999
    Publication date: November 14, 2002
    Inventors: HITOSHI ISHIKAWA, SATORU TOGUCHI, YUKIKO MORIOKA, ATSUSHI ODA
  • Patent number: 6476550
    Abstract: This invention provides organic electroluminescent devices in which a diffraction grating is formed as a constituent element thereof on the reflecting surface of the cathode or on the light output side, resulting in an improvement in light output efficiency.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: November 5, 2002
    Assignee: NEC Corporation
    Inventors: Atsushi Oda, Hitoshi Ishikawa, Satoru Toguchi
  • Publication number: 20020160225
    Abstract: An organic EL device with high brightness and long lifetime, which is capable of driving at low voltage, is provided. As the material for constituting the organic EL device, a specific styryl amino group-containing diphenyl aminoarylene represented by the following general formula [1] (wherein Ar1 is a substituted or unsubstituted arylene group having 5-42 carbons, Ar2 to Ar5 each independently represents substituted or unsubstituted C6 to C20 aryl groups, at least one of which is a styrylphenyl group represented by the following general formula [2]) is used in a light-emitting zone adjacent to an anode.
    Type: Application
    Filed: October 22, 1999
    Publication date: October 31, 2002
    Inventors: ATSUSHI ODA, HITOSHI ISHIKAWA, SATORU TOGUCHI, YUKIKO MORIOKA
  • Patent number: 6468675
    Abstract: An organic EL device includes a hole transport layer and a luminescent layer both disposed between an anode and a cathode.
    Type: Grant
    Filed: May 27, 1999
    Date of Patent: October 22, 2002
    Assignee: NEC Corporation
    Inventors: Hitoshi Ishikawa, Satoru Toguchi, Atsushi Oda
  • Patent number: 6465116
    Abstract: An organic electroluminescent (EL) device includes one or more organic thin film layers disposed between an anode and a cathode, at least one of said layers containing, in a form of a mixture or a single substance, a pentacene compound expressed in Formula 1, a dibenzoperylene compound expressed in Formula 3 or another dibenzoperylene compound expressed in Formula 4. The organic EL device exhibits higher luminance than that obtained by a conventional organic EL device.
    Type: Grant
    Filed: June 8, 1999
    Date of Patent: October 15, 2002
    Assignee: NEC Corporation
    Inventors: Hitoshi Ishikawa, Satoru Toguchi, Yukiko Morioka, Atsushi Oda
  • Patent number: 6456028
    Abstract: A pulse generating circuit for motor rotation of a direct current motor which is capable of pulse generation following the variation of the motor rotation condition and of stable ripple pulse generation. The pulse generating circuit for motor rotation includes a filter for varying a cut-off frequency fc by the signal from outside and for removing the noise based on the input signal from the direct current motor, a pulse forming circuit for forming the ripple pulse in accordance with the motor rotation of the direct current motor based on the output from the filter, a clock generating circuit for varying the cut-off frequency fc of the filter by providing the clock signal fCLK which is generated based on the rotational condition signal of the ripple pulse and the direct current motor to the filter, and a pulse correction circuit for generating the corrected ripple pulse when the frequency ratio between the ripple pulse and the clock signal fCLK is deviated.
    Type: Grant
    Filed: May 29, 2001
    Date of Patent: September 24, 2002
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Koji Aoki, Hideyuki Kanie, Hitoshi Ishikawa
  • Publication number: 20020113547
    Abstract: In an organic electroluminescent device, a plurality of striped grooves are formed on an insulating substrate along a first direction. A plurality of lower electrodes are substantially buried in the striped grooves. Organic layers are formed on the insulating substrate and the lower electrodes. A plurality of striped upper electrodes are formed on the organic layers along a second direction different from the first direction.
    Type: Application
    Filed: February 14, 2002
    Publication date: August 22, 2002
    Applicant: NEC CORPORATION
    Inventors: Hitoshi Ishikawa, Etsuo Hasegawa
  • Publication number: 20020110703
    Abstract: In an organic electroluminescent device, a plurality of striped lower electrodes are formed on an insulating substrate, and a plurality of fillers made of amorphous carbon are filled between the lower electrodes. Organic thin film layers including an emitting layer is formed on the fillers and the lower electrodes. A plurality of striped upper electrodes are formed on the organic thin film layer along a second direction different from the first direction.
    Type: Application
    Filed: February 15, 2002
    Publication date: August 15, 2002
    Applicant: NEC CORPORATION
    Inventors: Hiroshi Tada, Atsushi Oda, Hitoshi Ishikawa, Satoru Toguchi
  • Publication number: 20020079489
    Abstract: An organic electroluminescent (EL) device including an anode, a cathode, and an emitting layer and at least one organic thin-film layer which are sandwiched between said anode and said cathode, said organic thin-film layer including compound expressed by the following general formula [I], [II] or [III]. The organic EL device suppresses the light emission from the emitting layer, thereby generating original blue light emission. The above compound exhibits an excellent electron-transporting property, and the emitting layer containing the compound improves the device performance.
    Type: Application
    Filed: December 21, 2001
    Publication date: June 27, 2002
    Inventors: Hitoshi Ishikawa, Satoru Toguchi, Hiroshi Tada, Atsushi Oda
  • Patent number: 6396208
    Abstract: An organic electroluminescent device in which the electrode in the light-emitting side has small protrusions to allow the counter electrode to have a concave shape so as to utilize reflection by the concave and inclined mirror faces of the counter electrode to improve light-collection efficiency.
    Type: Grant
    Filed: January 27, 1999
    Date of Patent: May 28, 2002
    Assignee: NEC Corporation
    Inventors: Atushi Oda, Hitoshi Ishikawa, Satoru Toguchi
  • Publication number: 20020058156
    Abstract: An organic electroluminescent device comprising one or more organic thin film layers, at least one of the organic thin film layers containing a compound having a cyclohexylidenemethine group. This device has improved light-emitting properties such as luminance and luminous efficiencies, and no limitations on film deposition method in fabrication processes.
    Type: Application
    Filed: November 5, 2001
    Publication date: May 16, 2002
    Inventors: Satoru Toguchi, Hitoshi Ishikawa, Hiroshi Tada, Atsushi Oda
  • Publication number: 20020034654
    Abstract: An organic EL device comprising an anode, a cathode, and one or more organic thin-film layers having a light-emitting layer sandwiched between the anode and the cathode, the organic thin-film layers including, either singly or as a mixture, a perylene compound represented by a general formula [1] or a benzoperylene compound represented by a general formula [2].
    Type: Application
    Filed: December 14, 2000
    Publication date: March 21, 2002
    Applicant: NEC Corporation
    Inventors: Satoru Toguchi, Hitoshi Ishikawa, Hiroshi Tada, Yukiko Morioka, Atsushi Oda
  • Patent number: 6354275
    Abstract: A thermal type air flow meter includes a device for measuring an intake air flow rate by heating and controlling a heating resistor, and an analog-to-digital converter for digitizing an air flow rate signal of the air flow rate measurement device. The air flow rate measurement device inputs a reference voltage to the analog-to-digital converter so that the reference voltage can be converted from an analog signal to a digital signal, and the air flow rate signal can be corrected in accordance with the value of the reference voltage. A/D conversion of the air flow rate signal can be executed accurately even when the voltage of the reference voltage source of the A/D converter in an electrical control unit is fluctuating.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: March 12, 2002
    Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.
    Inventor: Hitoshi Ishikawa
  • Publication number: 20020028350
    Abstract: There is provided an electroluminescent device including an anode, a cathode, and at least one organic layer sandwiched between the anode and the cathode, the organic layer including at least a red light emitting layer, the organic layer containing a compound represented with the chemical formula C1, alone or in combination: 1
    Type: Application
    Filed: September 24, 2001
    Publication date: March 7, 2002
    Inventors: Satoru Toguchi, Atsushi Oda, Hitoshi Ishikawa
  • Publication number: 20020022150
    Abstract: A high-luminance organic EL device employs a particular tetrabenzo[de,hi,op,st]pentacene compound represented by the general formula (1): 1
    Type: Application
    Filed: May 24, 2001
    Publication date: February 21, 2002
    Applicant: NEC Corporation
    Inventors: Satoru Toguchi, Hitoshi Ishikawa, Hiroshi Tada, Atsushi Oda
  • Publication number: 20020022151
    Abstract: A high-brightness and long-life organic electroluminescent device, which employs, as a material for constituting an organic thin film interposed between an anode and a cathode, a specific fluoranthene compound represented by the following general formula [I] or a biphenylene compound represented by the following general formula [II]: 1
    Type: Application
    Filed: July 23, 2001
    Publication date: February 21, 2002
    Inventors: Hitoshi Ishikawa, Satoru Toguchi, Hiroshi Tada, Atsushi Oda
  • Publication number: 20020014222
    Abstract: To perform with high accuracy the analog-to-digital conversion of signals of an air flow meter irrespective of fluctuation of a reference voltage of an analog-to-digital conversion circuit. A thermal type air flow meter including means for measuring an intake air flow rate by heating and controlling a heating resistor and means for performing analog-to-digital conversion of an air flow rate signal of the air flow rate measurement means, which inputs a reference voltage to the analog-to-digital conversion circuit so that the reference voltage can be converted from the analog signal to the digital signal by the analog-to-digital conversion circuit, and the air flow rate signal can be corrected in accordance with the value of the reference voltage. A/D conversion of the air flow rate signal can be executed accurately even when the voltage of the reference voltage source of the A/D converter in an electrical control unit is fluctuating.
    Type: Application
    Filed: October 5, 2001
    Publication date: February 7, 2002
    Applicant: Hitachi, Ltd.
    Inventor: Hitoshi Ishikawa
  • Patent number: 6329083
    Abstract: An electroluminescent device including an anode, a cathode, and at least one organic layer sandwiched between the anode and the cathode, the organic layer including at least a light emitting layer containing a compound represented with the chemical formula C3, alone or in combination:
    Type: Grant
    Filed: November 5, 1998
    Date of Patent: December 11, 2001
    Assignee: NEC Corporation
    Inventors: Satoru Toguchi, Atsushi Oda, Hitoshi Ishikawa