Patents by Inventor Kiyoshi Nakamura
Kiyoshi Nakamura 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: 4700283Abstract: An electric locomotive has two AC-DC converters which are connected in cascade, and a power factor controller is connected to one of the converters. Two automatic pulse phase shifters are provided for the two converters and controlled by a signal responding to a difference signal between a current flowing in the converters and a reference signal. One of the input signals of the automatic pulse phase shifter is regulated by a bias signal. The output from each of the automatic pulse phase shifters to each of the converters is switched when the measured speed of the locomotive exceeds a predetermined reference speed signal.Type: GrantFiled: April 18, 1986Date of Patent: October 13, 1987Assignee: Hitachi, Ltd.Inventors: Yoshio Tsutsui, Kiyoshi Nakamura, Akira Kimura, Hayato Imai, Kaoru Tamura, Shozuchi Miura
-
Patent number: 4689530Abstract: Disclosed is a power supply apparatus for a linear motor transportation system having a number of discrete linear motor units serially arranged along a track to generate a moving magnetic field for driving vehicle.Type: GrantFiled: August 28, 1984Date of Patent: August 25, 1987Assignee: Hitachi, Ltd.Inventors: Kiyoshi Nakamura, Masayoshi Isaka, Toyoharu Uchiyama
-
Patent number: 4634300Abstract: A rotating member supporting apparatus has a rotating shaft which is inserted to a bore formed in a support member. A rolling bearing is interposed between the rotating shaft and support member and rotatably supports the rotating shaft. The bearing includes an inner and outer rings which have resistance to heat and corrosion, and a plurality of rolling elements rollably arranged between the inner and outer rings. The rolling elements are formed of ceramic material.Type: GrantFiled: March 29, 1985Date of Patent: January 6, 1987Assignees: Koyo Seiko Company Limited, Kabushiki Kaisha ToshibaInventors: Hiroaki Takebayashi, Fujio Harumi, Kiyoshi Nakamura, Koichi Inoue
-
Patent number: 4454457Abstract: In a linear motor composed of a propelling coil laid on continuously along a track and a field system mounted on a vehicle for driving it, the propelling coil of an enormous length is sectioned into a number of propelling coil units which are connected alternately to two sets of feeders by means of switches, the feeder sets being supplied with polyphase currents from different power converters, respectively. The propelling coil units are connected in series to one another without any interposed insulation and sectioned by a number of lead conductors so that every pair of the adjacent propelling coil units has a common coil portion shared by them and having a length not smaller than that of the vehicle. A pair of the polyphase lead conductors connected to each of the propelling coil units are connected, respectively, to going feeders and return feeders constituting the set of feeders through switches.Type: GrantFiled: June 14, 1982Date of Patent: June 12, 1984Assignee: Hitachi, Ltd.Inventors: Kiyoshi Nakamura, Masayoshi Isaka, Shigeyoshi Koike
-
Patent number: 4419971Abstract: A cylinder liner for use in an internal combustion engine which is formed of ceramic material having a density higher than 95% of theoretical value and a randomly directed and homogeneous structure. The ceramic liner is composed of silicon nitride, silicon carbide, an oxynitride such as silicon oxynitride and silicon aluminum oxynitride, silicon nitride-silicon carbide or aluminum nitride.Type: GrantFiled: November 23, 1982Date of Patent: December 13, 1983Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Kiyoshi Nakamura, Katsutoshi Nishida, Toshihiko Ochiai, Akio Ando, Syoji Okada
-
Patent number: 4385866Abstract: A curved blade rotor for a radial inflow turbo supercharger which is made of ceramic material and having a plurality of curved blades each with a curved outer edge. The surface roughness of the curved outer edge is 0.8S to 2S wherein "S" indicates surface roughness according to Japanese Industrial Standard B 0601.Type: GrantFiled: March 17, 1980Date of Patent: May 31, 1983Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Toshihiko Ochiai, Kiyoshi Nakamura, Katsutoshi Nishida, Masato Sakai
-
Patent number: 4381478Abstract: In a magnetic floating type of super high speed transportation system using a linear synchronous motor system as its drive system in which a field magnet is carried on a train and a series of armature coils are provided along a track, a speed of a train is regulated under control of a frequency converter of the variable frequency and voltage type for supplying power to the armature coils. For the speed regulation, a relative position of the field magnet to the armature coils is detected to form a train of position detecting pulses. A reference frequency pattern with a frequency corresponding to a speed command is formed. A phase difference between the reference frequency pattern and the position detecting pulse train is detected. A propulsion force command of a linear motor is obtained by setting different limit values in the positive and negative parts of the phase difference signal. A sinusoidal current waveform pattern is formed in synchronism with the position detecting pulse train.Type: GrantFiled: March 6, 1981Date of Patent: April 26, 1983Assignees: Hitachi, Ltd., Japanese National RailwaysInventors: Takashige Saijo, Haruo Ikeda, Kiyoshi Nakamura, Shigeyoshi Koike
-
Patent number: 4359022Abstract: A valve for an internal combustion engine formed of ceramic material for resistance to corrosion, heat and wear. The valve may include a valve tip, a lock groove, a valve stem, a valve fillet, a valve face, a valve margin and a valve head. Certain portions of the valve, such as the valve tip, the lock groove and the valve stem may, alternatively, be formed of metal. The ceramic material includes, among other compositions, silicon nitride, silicon carbide, aluminum nitride, silicon oxynitride, silicon aluminum oxynitride and silicon nitride-silicon carbide.Type: GrantFiled: March 17, 1980Date of Patent: November 16, 1982Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Kiyoshi Nakamura, Masae Nakanishi, Syozo Kawasaki, Toshihiko Ochiai, Katsutoshi Nishida
-
Patent number: 4348618Abstract: A feeding system for a linear motor transportation system in which a number of discrete drive coil units or linear motor units are arranged along a track to generate a moving magnetic field for driving trains is disclosed. In the present feeding system, a number of feeding sections extend contiguously along the track and each of the feeding sections includes at least one power supply station. Each feeding section is divided into at least two linear motor blocks each having a feeder block. The linear motor units in each of the linear motor blocks are connected through associated ones of a first group of switches to the associated feeder means which are connected to the power converter of the associated feeding section through associated ones of a second group of switches. Preferably, those adjacent two feeder blocks which belong to adjacent different feeding sections respectively are coupled together through an associated one of a third group of switches.Type: GrantFiled: March 21, 1980Date of Patent: September 7, 1982Assignee: Hitachi, Ltd.Inventors: Kiyoshi Nakamura, Masayoshi Isaka
-
Patent number: 4310492Abstract: An apparatus for making a single crystal which includes a sealed vessel, a crucible received in the sealed vessel to hold a molten liquid and a floating member having an opening for defining the cross sectional outline of a single crystal while being grown and floating on the molten liquid. The floating member is made from a sintered body consisting essentially of at least one of the oxides of yttrium and the lanthanum series elements, aluminum oxide, aluminum nitride and silicon nitride each in a prescribed amount.Type: GrantFiled: May 21, 1980Date of Patent: January 12, 1982Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Masae Nakanishi, Kiyoshi Nakamura, Syozo Kawasaki
-
Patent number: 4303870Abstract: A power supply system for a linear motor comprising a plurality of driving coils disposed along the track for a running body for generating a shifting magnetic field to drive the running body, power converter means for feeding the plurality of driving coils with electrical energy, a plurality of switches responsive to the movement of the running body for selectively electrically connecting each of the driving coils to the power converter means, a first reactive power controller continuously electrically connected to the power input side of the power converter means, and a second reactive power controller selectively electrically connected to the power input side of the power converter means in accordance with the movement of the running body, whereby the steady reactive-power is compensated for by the first reactive power controller and the reactive power which varies with the movement of the running body is compensated for by the second reactive power controller.Type: GrantFiled: August 7, 1979Date of Patent: December 1, 1981Assignee: Hitachi, Ltd.Inventors: Kiyoshi Nakamura, Masayoshi Isaka, Yoshimi Kurotaki, Yutaka Suzuki
-
Patent number: 4286211Abstract: A direct current detecting device is disclosed in which two pairs of saturable cores are provided so as to enclose a conductor carrying a direct current to be measured. On each of the saturable cores, a bias winding, a feedback winding and an output winding are wound. First and second output circuits are provided, each connected with a pair of output windings and each including two closed current paths consisting of the output winding, a common load, a common A.C. supply source and a diode. The diodes function to allow the greater one of current flows of the two closed paths to be passed through the common load. An amplifier is connected to receive the difference between output signals of the two output circuits. The output of the amplifier is supplied to the feedback winding whereby the magnitude of the feedback current becomes a function of the magnitude of the current flowing through the conductor.Type: GrantFiled: October 30, 1979Date of Patent: August 25, 1981Assignee: Hitachi, Ltd.Inventors: Kiyoshi Nakamura, Hiroaki Ishikawa, Hisakatsu Kiwaki, Fumio Ogata
-
Patent number: 4230494Abstract: An article has a portion contacted by gallium phosphide or gallium arsenide. At least the contacting portion is formed of a sintered body of a mixture of silicon nitride and an additive, and part or the whole of the additive is present as a crystallized phase in the sintered silicon nitride system.Type: GrantFiled: July 13, 1978Date of Patent: October 28, 1980Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Kiyoshi Nakamura, Michiyasu Komatsu, Masae Nakanishi
-
Patent number: 4172107Abstract: Composite ceramic articles formed by integrally assembling a plurality of previously molded constituent members without applying an adhesive to their joints and designed to have a density higher than 98% of the theoretical value, and a flexural strength greater than 50 kg/cm.sup.2 at 1200.degree. C., and a method of producing ceramic articles of particularly complex shape which comprises the steps of previously molding a plurality of constituent members of complex shape and later integrally assembling said constituent members without applying an adhesive to their joints.Type: GrantFiled: May 26, 1977Date of Patent: October 23, 1979Assignee: Tokyo Shibaura Electric Co., Ltd.Inventors: Kiyoshi Nakamura, Takashi Ishii, Michiyasu Komatsu, Tadashi Miyano, Masae Nakanishi
-
Patent number: 4156051Abstract: Composite ceramic articles formed by integrally assembling a plurality of previously molded constituent members without applying an adhesive to their joints and designed to have a density than higher 98% of the theoretical value, and a flexural strength greater than 50 kg/cm.sup.2 at 1200.degree. C., and a method of producing ceramic articles of particularly complicated shape which comprises the steps of previously molding a plurality of constituent members of complicated shape and later integrally assembling said constituent members without applying an adhesive to their joints.Type: GrantFiled: September 5, 1978Date of Patent: May 22, 1979Assignee: Tokyo Shibaura Electric Co., Ltd.Inventors: Kiyoshi Nakamura, Takashi Ishii, Michiyasu Komatsu, Tadashi Miyano, Masae Nakanishi
-
Patent number: 4068152Abstract: In a linear motor system in which the series of driving coils provided along a railway is divided into sections each including a plurality of coils, each section being fed through a power control switch which is closed in a sequential order, a plurality of such sections are grouped so that each group of sections is fed exclusively through one of a plurality of feeders from one of a plurality of power supplies.Type: GrantFiled: March 7, 1973Date of Patent: January 10, 1978Assignee: Hitachi, Ltd.Inventors: Kiyoshi Nakamura, Takashi Tsuboi, Nobuaki Otazawa
-
Patent number: 3985875Abstract: New .omega.-(N-acylamino)alkylphosphoryl ethanolamines and their pharmaceutically acceptable acid addition salts have superior renin-inhibitory activities, antihypertensive activities and cholesterol-lowering activities. The .omega.-(N-acylamino)alkylphosphoryl ethanolamines are prepared by (1) reacting an .omega.-(N-acylamino) alkanol with a 2-(N-substituted amino)ethyl phosphate or its derivative, hydrolyzing the resulting product or splitting off the phosphoric acid-protective group of the resulting product thereby to form an .omega.-(N-acylamino) alkyl 2-(N-substituted amino) ethyl phosphate, and splitting off the amino-protective groups of the resulting phosphate, or (2) reacting an .omega.-(N-acylamino) alkanol with a phosphorus oxyhalide, reacting the resulting .omega.-(N-acylamino)alkyl dichlorophosphate with a 2-(N-substituted amino) ethanol, hydrolyzing the reaction product to form an .omega.Type: GrantFiled: December 30, 1974Date of Patent: October 12, 1976Assignee: Dainippon Pharmaceutical Co., Ltd.Inventors: Kouji Hayashi, Masahisa Hashimoto, Kiyoshi Nakamura, Masanao Shimizu, Naonobu Hatano, Kunihiko Takeyama