Patents by Inventor Kenji Yagi

Kenji Yagi 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: 20090216039
    Abstract: Provided that a method for inexpensively producing optically active ?-ionone with a high yield and a high asymmetric yield and with good workability in a short process, and a perfume composition comprising the optically active ?-ionone obtained by the aforementioned method. A method for producing optically active ?-ionone, comprising allowing ?-ionone as a mixture of optical isomers to react with an esterification agent, and hydrolyzing the obtained ?-ionone enol ester; a method for producing optically active ?-ionone comprising subjecting ?-ionone as a mixture of optical isomers to an asymmetric reduction, allowing the obtained optically active ?-ionol to react with an esterification agent to give an optically active ?-ionol ester, hydrolyzing the obtained optically active ?-ionol ester after purification as necessary, and then oxidizing the obtained optically active ?-ionol; and a perfume composition comprising thus obtained optically active ?-ionone.
    Type: Application
    Filed: September 13, 2006
    Publication date: August 27, 2009
    Applicant: Takasago International Corporation
    Inventors: Tetsuya Yamamoto, Kenji Yagi, Kenya Ishida
  • Patent number: 7369883
    Abstract: A radio communication device comprises an upper housing and a lower housing connected by a hinge part to be mutually rotatable. A connection portion electrically connects a first circuit board in the upper housing and a second circuit board in the lower housing each other. An antenna is provided in the lower housing and has a base, an electric supply terminal and a ground terminal. An antenna electric supply part is provided to supply an operating current from the second circuit board to the antenna. A position of the antenna electric supply part is shifted from a central position of the second circuit board in an axial direction of the hinge part to increase a distance from the connection portion, and the electric supply terminal and the ground terminal are extended from the antenna base in the hinge part axial direction to contact the antenna electric supply part.
    Type: Grant
    Filed: September 14, 2004
    Date of Patent: May 6, 2008
    Assignee: Fujitsu Limited
    Inventors: Katsushige Kori, Kenji Yagi, Yoshito Fukata, Youichi Kitagishi, Masaharu Tosa
  • Patent number: 7145254
    Abstract: A semiconductor device includes a semiconductor chip that generates heat in operation, a pair of heat sinks for cooling the chip, and a mold resin, in which the chip and the heat sinks are embedded. The thickness t1 of the chip and the thickness t2 of one of heat sinks that is joined to the chip using a solder satisfy the equation of t2/t1?5. Furthermore, the thermal expansion coefficient ?1 of the heat sinks and the thermal expansion coefficient ?2 of the mold resin satisfy the equation of 0.5??2/?1?1.5. In addition, the surface of the chip that faces the solder has a roughness Ra that satisfies the equation of Ra?500 nm. Moreover, the solder is a Sn-based solder to suppress relaxation of a compressive stress in the chip, which is caused by the creeping of the solder.
    Type: Grant
    Filed: July 24, 2002
    Date of Patent: December 5, 2006
    Assignee: Denso Corporation
    Inventors: Naohiko Hirano, Takanori Teshima, Yoshimi Nakase, Kenji Yagi, Yasushi Ookura, Kuniaki Mamitsu, Kazuhito Nomura, Yutaka Fukuda
  • Publication number: 20060122225
    Abstract: The present invention provides an industrially advantageous production method of optically active tetrahydroquinolines of formula (1), which comprises: 1) a step of reacting a ?-ketoester of formula (2) ?with an amine of formula (3) ?to produce an enaminoester of formula (4); 2) a step of subjecting the enaminoester of formula (4) above obtained in 1) to asymmetric hydrogenation to produce an optically active ?-amino acid derivative of formula (5); 3) a step of amidating the optically active ?-amino acid derivative (5) above obtained in 2) to produce an amide of formula (6); 4) a step of alkoxycarbonylating the amide of formula (6) above obtained in 3) to produce a compound of formula (7); ?and 5) a step of subjecting the compound of formula (7) above to cyclization to produce the optically active tetrahydroquinoline of formula (1).
    Type: Application
    Filed: February 17, 2004
    Publication date: June 8, 2006
    Inventors: Takashi Moroi, Tsukasa Sotoguchi, Kazuhiko Matsumura, Motonobu Takenaka, Wataru Kuriyama, Toshiyuki Murayama, Hideki Nara, Tohru Yokozawa, Kenji Yagi
  • Patent number: 6984738
    Abstract: The present invention is to provide a process for producing an optically active amino alcohol which is useful for the synthesis of natural substances and as an intermediate for drugs and agricultural chemicals in a high yield, a high selectivity and an economical manner with a good working efficiency and the present invention relates to a process for producing an optically active amino alcohol represented by the following formula (2) (in the formula, R1 is a hydrocarbon group, a substituted hydrocarbon group, an aromatic heterocyclic group, a substituted aromatic heterocyclic group, an aliphatic heterocyclic group or a substituted aliphatic heterocyclic group; R2 and R3 each independently is hydrogen atom, a hydrocarbon group, a substituted hydrocarbon group, an acyl group, an acyloxy group, an alkyloxycarbonyl group, an aralkyloxycarbonyl group, an aryloxycarbonyl group, an aromatic heterocyclic group, a substituted aromatic heterocyclic group, an aliphatic heterocyclic group or a substituted aliphatic h
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: January 10, 2006
    Inventors: Tohru Yokozawa, Kenji Yagi, Takao Saito
  • Publication number: 20050227634
    Abstract: A radio communication device comprises an upper housing and a lower housing connected by a hinge part to be mutually rotatable. A connection portion electrically connects a first circuit board in the upper housing and a second circuit board in the lower housing each other. An antenna is provided in the lower housing and has a base, an electric supply terminal and a ground terminal. An antenna electric supply part is provided to supply an operating current from the second circuit board to the antenna. A position of the antenna electric supply part is shifted from a central position of the second circuit board in an axial direction of the hinge part to increase a distance from the connection portion, and the electric supply terminal and the ground terminal are extended from the antenna base in the hinge part axial direction to contact the antenna electric supply part.
    Type: Application
    Filed: September 14, 2004
    Publication date: October 13, 2005
    Applicant: FUJITSU LIMITED
    Inventors: Katsushige Kori, Kenji Yagi, Yoshito Fukata, Youichi Kitagishi, Masaharu Tosa
  • Patent number: 6948340
    Abstract: Disclosed is a method of producing an elliptic core optical fiber, in which a original preform having a circular core disposed at the center of a circular clad is processed to flatten on its periphery to form a processed preform that is then drawn with heating into an elliptic core optical fiber. According to the invention, the form of the processed preform used for producing an elliptic core optical fiber with desired specific dimensions can be designed using pre-obtained correlations based on the dimensions of the elliptic core optical fiber. If the processed preform designed like this is drawn with heating, an elliptic core optical fiber with desired specific dimensions can be reliably and easily produced.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: September 27, 2005
    Assignee: Moritex Corporation
    Inventors: Shuji Okagawa, Hideo Kato, Kenji Yagi
  • Patent number: 6829452
    Abstract: A clearance regulating amount L by a clearance regulating member 4, which is provided above a developing roller 3 on a side closer to a photosensitive drum 1, is determined at a size not greater than a height T of a developer at a magnetic pole just downstream of the clearance regulated position. Thus, the scattering of the developer from a developing unit 2 is significantly reduced.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: December 7, 2004
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takeshi Tanimoto, Kenji Yagi
  • Publication number: 20040082794
    Abstract: The present invention is to provide a process for producing an optically active amino alcohol which is useful for the synthesis of natural substances and as an intermediate for drugs and agricultural chemicals in a high yield, a high selectivity and an economical manner with a good working efficiency and the present invention relates to a process for producing an optically active amino alcohol represented by the following formula (2) 1
    Type: Application
    Filed: October 17, 2003
    Publication date: April 29, 2004
    Inventors: Tohru Yokozawa, Kenji Yagi, Takao Saito
  • Patent number: 6717785
    Abstract: A semiconductor switching element driving circuit comprises an overcurrent limiting circuit which instantaneously drops a voltage of a gate terminal of an IGBT when a main IGBT current becomes larger than a predetermined level i1. An overcurrent protection circuit which first decreases the main IGBT current at a first inclination when the main IGBT current becomes larger than the other level i2 lower than the i1 and then reduces the main IGBT current at a steep second inclination when it becomes smaller than another level i3.
    Type: Grant
    Filed: March 29, 2001
    Date of Patent: April 6, 2004
    Assignee: Denso Corporation
    Inventors: Yutaka Fukuda, Ryoichi Okuda, Tomoatsu Makino, Kenji Yagi, Yukio Tsuzuki
  • Publication number: 20040012701
    Abstract: A portable electronic device is less subject to aging, and it is easy to obtain assembly accuracy even if there are variations in individual components. The portable electronic device in the form of a mobile phone (100) includes a display (11) for displaying an image, and a camera (20) supported by a bearing (31) and a hinge module (32) for forward and reverse rotation so as to be able to take pictures of images, which can be displayed on the display, from a front side to a rear side of the display. A reflector (34) is rotated in accordance with the rotation of the camera and has a plurality of areas “A”, “B”, “C” of different reflection factors arranged along its circumferential direction. For determination of a control mode, a reflective photosensor (44) optically detects the rotational position of the camera by projecting a beam of light toward the reflector and by receiving the light reflected from the reflector.
    Type: Application
    Filed: January 6, 2003
    Publication date: January 22, 2004
    Applicant: FUJITSU LIMITED
    Inventors: Seiji Nagai, Katsumi Adachi, Kenji Yagi, Hitoshi Shiroyama, Koji Hirata
  • Publication number: 20030022464
    Abstract: A semiconductor device includes a semiconductor chip that generates heat in operation, a pair of heat sinks for cooling the chip, and a mold resin, in which the chip and the heat sinks are embedded. The thickness t1 of the chip and the thickness t2 of one of heat sinks that is joined to the chip using a solder satisfy the equation of t2/t1≧5. Furthermore, the thermal expansion coefficient &agr;1 of the heat sinks and the thermal expansion coefficient &agr;2 of the mold resin satisfy the equation of 0.5≦&agr;2/&agr;1≦1.5. In addition, the surface of the chip that faces the solder has a roughness Ra that satisfies the equation of Ra≦500 nm. Moreover, the solder is a Sn-based solder to suppress relaxation of a compressive stress in the chip, which is caused by the creeping of the solder.
    Type: Application
    Filed: July 24, 2002
    Publication date: January 30, 2003
    Inventors: Naohiko Hirano, Takanori Teshima, Yoshimi Nakase, Kenji Yagi, Yasushi Ookura, Kuniaki Mamitsu, Kazuhito Nomura, Yutaka Fukuda, Mikimasa Suzuki, Chikage Noritake
  • Publication number: 20020162361
    Abstract: Disclosed is a method of producing an elliptic core optical fiber, in which a original preform having a circular core disposed at the center of a circular clad is processed to flatten on its periphery to form a processed preform that is then drawn with heating into an elliptic core optical fiber.
    Type: Application
    Filed: March 15, 2002
    Publication date: November 7, 2002
    Inventors: Shuji Okagawa, Hideo Kato, Kenji Yagi
  • Publication number: 20020061209
    Abstract: A clearance regulating amount L by a clearance regulating member 4, which is provided above a developing roller 3 on a side closer to a photosensitive drum 1, is determined at a size not greater than a height T of a developer at a magnetic pole just downstream of the clearance regulated position. Thus, the scattering of the developer from a developing unit 2 is significantly reduced.
    Type: Application
    Filed: January 18, 2002
    Publication date: May 23, 2002
    Applicant: Fujitsu Limited
    Inventors: Takeshi Tanimoto, Kenji Yagi
  • Publication number: 20010026429
    Abstract: A semiconductor switching element driving circuit comprises an overcurrent limiting circuit which instantaneously drops a voltage of a gate terminal of an IGBT when a main IGBT current becomes larger than a predetermined level i1. An overcurrent protection circuit which first decreases the main IGBT current at a first inclination when the main IGBT current becomes larger than the other level i2 lower than the i1 and then reduces the main IGBT current at a steep second inclination when it becomes smaller than another level i3.
    Type: Application
    Filed: March 29, 2001
    Publication date: October 4, 2001
    Inventors: Yutaka Fukuda, Ryoichi Okuda, Tomoatsu Makino, Kenji Yagi, Yukio Tsuzuki
  • Patent number: 6269210
    Abstract: An optical fiber ribbon includes a plurality of optical fibers arranged in a row and an outer coating formed around the optical fibers. Each of the optical fibers has a core, a cladding, and a non-strippable thin coating made of synthetic resin with a Young's modulus of 50 kg/mm2 to 250 kg/mm2 at room temperature and coated around the cladding. The concentricity of the core to the diameter of the non-strippable thin coating is 1 &mgr;m or less.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: July 31, 2001
    Assignees: Showa Electric Wire & Cable Co., Ltd., Nippon Telegraph and Telephone Corp.
    Inventors: Kenji Yagi, Tomotaka Murase, Keiko Shiraishi, Ken-ichi Muta, Yuichi Morishita, Takashi Yoshida, Masaru Kobayashi, Koichi Arishima, Shin Sumida
  • Patent number: 5869962
    Abstract: A magnetic detection apparatus detects movement of an object having a nonuniform system of teeth by means of magneto-electric conversion devices, wherein technical problems such as too large an amplified output signal, a nonuniform pulse period and a complicated circuit configuration can be solved. A plurality of uniform triangular teeth are formed on the circumference of a gear at equal angular intervals, and in a predetermined region a trapezoidal tooth is formed, where the height of the trapezoidal tooth is smaller than the height of the uniform teeth but greater than half their height. The magnetized surface of a bias magnet facing the gear generates a bias magnetic field directed toward the gear. Magneto-resistive devices are provided in the bias magnetic field. Variations in state of the bias magnetic field generated by the bias magnetic magnet when the gear is rotated are converted into an output electrical signal by the magneto-resistive devices.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: February 9, 1999
    Assignee: Nippondenso Co., Ltd.
    Inventors: Shigehiro Kasumi, Tatsuo Tamura, Kenji Yagi, Ichirou Izawa
  • Patent number: 5729127
    Abstract: In a magnetism detecting apparatus, a magnetoresistance element is positioned adjacent to a gear with teeth to be responsive to magnetic field applied thereto. The gear is shaped such that each of the teeth satisfies SA/(SA+SB)<0.125, where SA denotes a cross-sectional area of a tip portion of each of the teeth, which tip portion is measured through 10% of a height of each of the teeth taken from a tip of each of the teeth, and SB denotes a cross-sectional area of a notch portion of each notch between the teeth, which notch portion has a height corresponding to the height of the teeth. As a result of this configuration, distortion contained in an output signal based upon high and low threshhold values from the magnetoresistance element can be eliminated. In addition, variations in intervals of a pulse signal obtained by performing a waveform shaping operation can be reduced, even when a distance between the gear teeth and the magnetoresistance element is varied.
    Type: Grant
    Filed: September 12, 1995
    Date of Patent: March 17, 1998
    Assignee: Nippondenso Co., Ltd.
    Inventors: Tatsuo Tamura, Kenji Yagi, Yasuaki Makino, Ichiro Izawa
  • Patent number: 5637995
    Abstract: A magnetic detection device including a biasing magnet for generating a bias magnetic field directed to an object of detection having a magnetic material; a magnetoresistance effective element disposed at an inclination of about 45.degree. to the direction of the bias magnetic field to provide a change in resistance caused by the bias magnetic field in accordance with movement of the object of detection, so as to detect a change in state of the bias magnetic field via the change in resistance of the magnetoresistance effective element; and the biasing magnet having a hollow portion containing a holder for holding the magnetoresistance effective element in a position between a surface of the biasing magnet and the object of detection and close to the surface of the biasing element.
    Type: Grant
    Filed: March 21, 1995
    Date of Patent: June 10, 1997
    Assignee: Nippondenso Co., Ltd.
    Inventors: Ichiro Izawa, Yasuaki Makino, Susumu Kuroyanagi, Seiki Aoyama, Shigehiro Kasumi, Kenji Yagi, Kazuo Kajimoto, Masaki Takashima, Shinichi Konda
  • Patent number: 4768859
    Abstract: A cladding glass for optical fiber comprises 60 to 80% by weight of silicon dioxide (SiO.sub.2), 0.5 to 10% by weight of aluminum oxide (Al.sub.2 O.sub.3), 9 to 17% by weight of an alkali metal oxide, 3 to 15% by weight of boron oxide (B.sub.2 O.sub.3) and more than 0 but not more than 3% by weight of fluorine (F). The cladding glass of this invention can simultaneously satisfy low refractive index and lowered viscosity, and is also excellent in water resistance and weathering resistance.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: September 6, 1988
    Assignees: Kabushiki Kaisha Toshiba, Showa Electric Wire & Cable Co., Ltd.
    Inventors: Mituo Kasori, Hiroshi Imagawa, Hironori Maki, Kenji Yagi, Osamu Kokubo