Patents by Inventor Keiichi Takahashi
Keiichi Takahashi 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).
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Patent number: 6426018Abstract: The present invention provides a piezoelectric ceramic composition which contains no lead and has piezoelectric characteristics suitable for practical use. The piezoelectric ceramic composition has a complex perovskite structure represented by the formula: (1−x−y−z)BaTiO3-x(Bi1/2Na1/2)TiO3-yCaTiO3-zBa (Zn1/3Nb2/3)O3 and comprises Ba, Ti, O, Bi, Na, Ca, Zn and Nb in the proportion satisfying the following conditions of x, y and z: 0.0<x≦0.90, 0.0≦y≦0.20, and 0.0≦z≦0.05.Type: GrantFiled: November 20, 2001Date of Patent: July 30, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Keiichi Takahashi, Masamitsu Nishida
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Publication number: 20020098968Abstract: The present invention provides a piezoelectric ceramic composition which contains no lead and has piezoelectric characteristics suitable for practical use.Type: ApplicationFiled: November 20, 2001Publication date: July 25, 2002Inventors: Keiichi Takahashi, Masamitsu Nishida
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Publication number: 20020066882Abstract: The present invention provides a piezoelectric ceramic composition that can be manufactured easily by an ordinary sintering method, is free from lead, and has a large frequency constant, a small grain size, and a high mechanical Q. This composition is expressed by a formula of (1−v−w)[(Li1-x-yNaxKy)zRO3].vLMnO3.wBi½Na½TiO3. The present invention also provides a piezoelectric ceramic composition, including at least one selected from Mn, Cr, and Co that is added to a composition expressed by a formula of (Li1-x-yNaxKy)zRO3 so as to have a ratio thereof to the whole of 0.01 to 1 wt % in terms of MnO2, Cr2O3, and CoO, respectively. In the above-mentioned formulae, 0≦v≦0.05, 0≦w≦0.2, v+w>0, 0.2≦x≦0.97, 0≦y≦0.8, x+y≧0.8, 0.98≦z≦1, L indicates at least one element selected from the rare earth elements, and R denotes at least one element selected from Nb, Ta, and Sb.Type: ApplicationFiled: November 13, 2001Publication date: June 6, 2002Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Masamitsu Nishida, Keiichi Takahashi, Kojiro Okuyama, Junichi Kato
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Publication number: 20020060306Abstract: The present invention provides a piezoelectric ceramic composition that is free from lead and has a small grain size, a high coupling coefficient, a high mechanical Q, and a large frequency constant. This composition is characterized by being expressed by a formula of (LixNa1−x−yKy)z−2wMa2wNb1−2MbwO3, wherein 0.03≦x≦0.2, 0≦y≦0.2, 0.98≦z≦1, 0<w≦0.05, Ma indicates at least one element selected from the alkaline-earth metals, and Mb denotes at least one element selected from Bi, Sb, and the rare earth elements.Type: ApplicationFiled: November 27, 2001Publication date: May 23, 2002Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Masamitsu Nishida, Keiichi Takahashi, Kojiro Okuyama, Hiroshi Sogou, Junichi Kato
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Patent number: 6330928Abstract: A driving force control device for a four-wheel drive vehicle including one pair of front or rear driven wheels which are driven directly by a prime mover and another pair of front or rear driven wheels which are driven via a hydraulic clutch, a first hydraulic pump which is driven by being operatively connected to the one pair of driven wheels, and a second hydraulic pump which is driven by being operatively connected to the other pair of driven wheels. The engagement force of the hydraulic clutch is controllable based on the difference in rotation of the first and second hydraulic pumps. The torque transmission to the other pair of the front or rear driven wheels can thus be controlled according to the driving conditions of the vehicle.Type: GrantFiled: June 1, 2000Date of Patent: December 18, 2001Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Shigenobu Sekiya, Hiroyuki Matsuo, Keiichi Takahashi, Yasunori Arai
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Publication number: 20010042852Abstract: The piezoelectric ceramic composition of the present invention contains, as a main component, a material having a composition represented by Formula: CaMXBi4−xTi4−X(Nb1−ATaA)XO15, where M is at least one element selected from the group consisting of Ca, Sr, and Ba; 0.0≦A≦1.0; and 0.0≦X≦0.6.Type: ApplicationFiled: February 26, 2001Publication date: November 22, 2001Inventors: Keiichi Takahashi, Masamitsu Nishida, Hiroshi Sogou
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Patent number: 6195003Abstract: A fire alarming system includes a plurality of terminal devices including fire sensors, transmitters, manual boxes, and/or other devices to be controlled; and a receiving device to which the plurality of terminal devices are connected. A great number of terminal devices with a manual box are connected to the receiving device. When a plurality of manual boxes are activated at the same time, the terminal devices corresponding to the activated manual boxes can be called at the same time without encountering a collision among returning-back signals transmitted from these terminal devices. That is, when a plurality of manual boxes are activated at the same time, the signal of only one of the plurality of activated manual boxes can arrive at the receiving device.Type: GrantFiled: May 14, 1999Date of Patent: February 27, 2001Assignee: Nohmi Bosai Ltd.Inventors: Nobuyuki Ichikawa, Eiji Hirooka, Keiichi Takahashi, Kenji Takeyoshi
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Patent number: 6123867Abstract: A piezoelectric ceramic composition comprises a composite oxide of Pb, Ti and Zr as a main component and Mn and at least one metal element selected from the group consisting of Y, Dy, Er, Ho, Tm, Lu and Yb as subsidiary components. A piezoelectric device comprises such a piezoelectric ceramic composition.Type: GrantFiled: December 1, 1998Date of Patent: September 26, 2000Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Keiichi Takahashi, Masamitsu Nishida, Hiroshi Asano, Hiroyuki Hase
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Patent number: 6091328Abstract: A fire alarming system includes a plurality of terminal devices including fire sensors, transmitters, manual boxs, and/or other devices to be controlled; and a receiving device to which the plurality of terminal devices are connected. A great number of terminal devices with a manual box are connected to the receiving device. When a plurality of manual boxs are activated at the same time, the terminal devices corresponding to the activated manual boxs can be called at the same time without encountering a collision among returning-back signals transmitted from these terminal devices. That is, when a plurality of manual boxs are activated at the same time, the signal of only one of the plurality of activated manual boxs can arrive at the receiving device.Type: GrantFiled: March 24, 1997Date of Patent: July 18, 2000Assignee: Nohmi Bosai Ltd.Inventors: Nobuyuki Ichikawa, Eiji Hirooka, Keiichi Takahashi, Kenji Takeyoshi
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Patent number: 6081192Abstract: An object of the present invention is to provide a fire alarm system which is adaptable to form a large-size fire alarm system and is capable of causing a receiving portion to quickly detect fire information from a terminal unit, or the like, if the terminal unit has been operated. In a fire alarm system in which terminal units, such as fire detectors, are connected to the receiving portion, an address is given to the terminal unit to allow detection of terminal units that have a status change, wherein system polling or the like for a specific terminal unit, such as a transmitter, among the terminal units is performed prior to performing system polling of other terminal units.Type: GrantFiled: February 10, 1998Date of Patent: June 27, 2000Assignee: Nohmi Bosai Ltd.Inventors: Kaoru Takahashi, Keiichi Takahashi, Yukihiko Usami, Kouichi Hishino
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Patent number: 5790018Abstract: An object of the present invention is to provide a fire alarm system which is adaptable to form a large-size fire alarm system and is capable of causing a receiving portion to quickly detect fire information from a terminal unit, or the like, if the terminal unit has been operated. In a fire alarm system in which terminal units, such as fire detectors, are connected to the receiving portion, an address is given to the terminal unit to allow detection of terminal units that have a status change, wherein system polling or the like for a specific terminal unit, such as a transmitter, among the terminal units is performed prior to performing system polling of other terminal units.Type: GrantFiled: October 12, 1994Date of Patent: August 4, 1998Assignee: Nohmi Bosai Ltd.Inventors: Kaoru Takahashi, Keiichi Takahashi, Yukihiko Usami, Kouichi Hishino
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Patent number: 5734321Abstract: When updating the data of an EEPROM, wherein set data such as interlock data showing the interlock relationship between fire detectors and controlled equipment, data on correspondence between terminal addresses and places where the terminals are installed, display data to be shown on a display unit of the fire protection receiver, and receiver function data showing the functions of the fire protection receiver is stored, a fire protection receiver according to the present invention employs a memory pack comprised of an IC card or the like, which is disconnectably attached to the fire protection receiver, connects a memory pack, which stores data for updating set data, into the receiver, reads it, and writes it to the EEPROM.Type: GrantFiled: December 11, 1996Date of Patent: March 31, 1998Assignee: Nohmi Bosai Ltd.Inventor: Keiichi Takahashi
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Patent number: 5724023Abstract: A portable fire alarm system setting device allows easy confirmation of information such as address information set in a storage element which cannot be seen visually from the outside of a terminal device, for example, a fire detector, and also allows the set information to be changed when necessary. The setting device for the fire alarm system comprises bases 33 and 34 for transmitting power and information signals regarding, for example, an address to the fire detector, the bases having removably connected thereto fire detectors 20 and 21 for the fire alarm system; a microcomputer 5 having a confirmation mode and a setting mode for controlling the sending and receiving of, for example, address information signals to and from the fire detector through transmission circuits 10 and 11; an indicator section 8 connected to the microcomputer 5 for indicating the fire detector address; and an operation section 7 used to send out an address as operation information to the fire detector.Type: GrantFiled: March 28, 1995Date of Patent: March 3, 1998Assignee: Nohmi Bosai Ltd.Inventors: Keiichi Takahashi, Kazuki Takumi
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Patent number: 5635904Abstract: A fire alarm system having terminal units in a supervisory system for supervising a fire phenomenon, a receiving portion and terminal units in a control system to be controlled by the receiving portion that is able to reduce a required space in a case of a small size system. The terminal units in the supervisory system are given individual addresses, the terminal units in the supervisory system and the receiving portion communicate with each other through the addresses, and the terminal units in the control system are connected to the receiving portion through individual signal lines.Type: GrantFiled: October 18, 1994Date of Patent: June 3, 1997Assignee: Nohmi Bosai Ltd.Inventors: Keiichi Takahashi, Atsushi Ohkawara
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Patent number: 5428341Abstract: A fire receiver including: an operation selection switch for selecting a desired operation from a plurality of operations that can be executed; an address selection switch for selecting a desired address from different addresses respectively given to a plurality of fire detectors and lines; an address changing device for continuously changing the address to be selected in accordance with the operation of the address selection switch; an address display device for displaying the address to be instructed which has been changed by the address changing device; and a command device for commanding a fire detector or a line corresponding to the address displayed by the address display device to perform the operation selected by the operation selection switch.Type: GrantFiled: March 22, 1994Date of Patent: June 27, 1995Assignee: Nohmi Bosai Ltd.Inventor: Keiichi Takahashi
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Patent number: 5344926Abstract: Disclosed is a process for producing a staurosporine derivative represented by Formula (I): Q is defined as in specification: ##STR1## The staurosporine derivative (I-1) possesses selective protein kinase C-inhibitory and cell growth-inhibiting activities, and platelet-increasing activity.Type: GrantFiled: June 22, 1993Date of Patent: September 6, 1994Assignee: Kyowa Hakko Kogyo Co., Ltd.Inventors: Chikara Murakata, Toshimitsu Takiguchi, Shigeo Katsumata, Akira Mihara, Keiichi Takahashi, Hiromitsu Saito, Shiro Akinaga, Masami Okabe, Yutaka Saito
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Patent number: 5179606Abstract: In an optical coupler for dividing or combining lights of different wavelengths, at least one wavelength separating filter connector terminal is provided at least one light input and output terminals. The wavelength separating filter connector comprises first and second optical fibers which are in contact with each other by placing an optical wavelength separating filter film between the first and second optical fibers, so that an isolation is large between separated lights.Type: GrantFiled: May 17, 1990Date of Patent: January 12, 1993Assignee: NEC CorporationInventors: Shigeru Kaihara, Keiichi Takahashi
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Patent number: 5138059Abstract: Novel DC-89 compounds represented by the general formula: ##STR1## wherein X represents a single bond or --CH.sub.2 --; and when X represents a single bond, Y represents --CH.sub.2 Br or --CH.sub.2 Cl and when X represents --CH.sub.2 --, Y represents Br, are obtained by the present invention. The compounds have antibacterial and anti-tumor activity.Type: GrantFiled: July 17, 1989Date of Patent: August 11, 1992Assignee: Kyowa Hakko Kogyo Co., Ltd.Inventors: Keiichi Takahashi, Michio Ichimura, Shigeo Katsumata, Tatsuhiro Ogawa, Makoto Morimoto, Tadashi Ashizawa, Masaji Kasai, Kenichi Muroi, Hiromitsu Saito, Hiroshi Sano, Toru Yasuzawa
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Patent number: 5113825Abstract: An engine controller which is arranged to operate a governor through an actuator which is controllable either by an accelerator lever in an operator's station or by radio control. First and second levers are rotatably mounted on a shaft, and are biased respectively by a spring to turn in one direction. The first lever is connected to the governor by a wire in such a manner as to increase the engine speed when turned in a direction reverse to the biased direction. The second lever is connected to the accelerator lever by a second wire in such a manner as to rotate in the reverse direction when the accelerator lever is operated in the direction of acceleration. A pulley is mounted on the shaft, and a third lever is securely fixed to the pulley. The pulley is connected to the actuator by a third wire such that the pulley is rotated according to the rotation of the actuator. A rod is securely fixed to the first lever to transmit the reverse rotations of the second and third levers to the first lever.Type: GrantFiled: August 16, 1991Date of Patent: May 19, 1992Assignee: Shin Caterpillar Mitsubishi Ltd.Inventor: Keiichi Takahashi
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Patent number: 5101038Abstract: A novel fermentation product, DC113, represented by the formula ##STR1## which has antimicrobial and antitumor activities.Type: GrantFiled: December 28, 1989Date of Patent: March 31, 1992Assignee: Kyowa Hakko Kogyo Co., Ltd.Inventors: Hirofumi Nakano, Isami Takahashi, Isao Kawamoto, Toru Yasuzawa, Keiichi Takahashi, Eiji Kobayashi