Patents Assigned to Tohoku Electric Power Co., Inc.
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Patent number: 5599775Abstract: Provided is an Hg--Ba--Ca--Cu--O oxide superconductor having a high superconductivity transition temperature Tc and a method which can prepare the same in excellent reproducibility. This oxide superconductor consists essentially of Hg, Ba, Ca, Cu and O, and is expressed in a chemical formula (Hg.sub.1-X Cu.sub.X)Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.y, wherein X=0.05 to 0.7 and Y=8 to 8.75. A method of preparing the oxide superconductor comprises a step of mixing raw materials of Hg, Ba, Ca and Cu with each other so that (Hg+Ba):Ca:Cu =b:1:C and Hg:Ba=(1-a):a, wherein 0.625.ltoreq.a.ltoreq.0.714, 1.ltoreq.b.ltoreq.3 and 1.667.ltoreq.c.ltoreq.3.444, in mole ratio, and compression-molding the mixture, and a step of heat treating a compact obtained by the compression molding. This oxide superconductor has a superconductivity transition temperature Tc of 134 K, which is the highest at present.Type: GrantFiled: January 26, 1996Date of Patent: February 4, 1997Assignees: Sumitomo Electric Industries, Ltd., Tohoku Electric Power Co., Inc., Matsushita Electric Industrial Co., Ltd., International Superconductivity Technology CenterInventors: Makoto Itoh, Ayako Yamamoto, Kazuyuki Isawa, Seiji Adachi, Hisao Yamauchi, Shoji Tanaka
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Patent number: 5553079Abstract: A radio communication apparatus for transmitting a voice signal and a data signal in a multiplex form. The transmitting side of the radio communication apparatus includes: a sampling unit for sampling the voice signal and the data signal and generating a digital voice signal and a digital data signal; a time division unit for dividing the digital voice signal and the digital data signal on the basis of a predetermined period; a modulation unit for modulating the divided digital data signal by a predetermined digital modulation scheme; a unit for compressing the divided digital voice signal at a predetermined compression factor and generating a compressed voice signal; a unit for combining the divided and compressed voice signal and the divided and digitally modulated digital data signal and generating a multiplex signal; and a unit for modulating a carrier signal by the multiplex signal and transmitting the modulated carrier signal as a transmission signal.Type: GrantFiled: March 30, 1995Date of Patent: September 3, 1996Assignees: Hitachi Denshi Kabushiki Kaisha, Tohoku Electric Power Co., Inc.Inventors: Atsuyoshi Niki, Tsyneyuki Minowa, Ichiro Maeda, Sakari Ohira
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Patent number: 5534490Abstract: Provided is an Hg-Ba-Ca-Cu-O oxide superconductor having a high superconductivity transition temperature Tc and a method which can prepare the same in excellent reproducibility. This oxide superconductor consists essentially of Hg, Ba, Ca, Cu and O, and is expressed in a chemical formula (Hg.sub.1-X Cu.sub.X)Ba.sub.2 Ca.sub.2 Cu.sub.3 O.sub.Y, wherein X=0.05 to 0.7 and Y=8 to 8.75. A method of preparing the oxide superconductor comprises a step of mixing raw materials of Hg, Ba, Ca and Cu with each other so that (Hg+Ba):Ca:Cu=b:1:C and Hg:Ba=(1-a):a, wherein 0.625.ltoreq.a.ltoreq.0.714, 1.ltoreq.b.ltoreq.3 and 1.667.ltoreq.c.ltoreq.3.444, in mole ratio, and compression-molding the mixture, and a step of heat treating a compact obtained by the compression molding. This oxide superconductor has a superconductivity transition temperature Tc of 134 K., which is the highest at present.Type: GrantFiled: June 23, 1994Date of Patent: July 9, 1996Assignees: Sumitomo Electric Industries, Ltd., Tohoku Electric Power Co., Inc., Matsushita Electric Industrial Co., Ltd., International Superconductivity Technology CenterInventors: Makoto Itoh, Ayako Yamamoto, Kazuyuki Isawa, Seiji Adachi, Hisao Yamauchi, Shoji Tanaka
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Patent number: 5524274Abstract: A transceiver having a transmitting unit and a receiving unit for performing substantially simultaneous communication with another transceiver in both directions by using a single frequency carrier. The transceiver includes a unit for generating a synchronizing signal for alternately switching between a transmission time period and a reception time period of the transceiver at a predetermined period, a signal processing unit for converting an input signal into a compressed signal by compressing a time axis of the input signal by a predetermined ratio, and affixing the synchronizing signal to the compressed signal, a unit for supplying the compressed signal with the synchronizing signal to the transmitting unit during the transmission time period, and a unit for reproducing an original signal from a signal transmitted from the other transceiver and received by the receiving unit during the reception time period, by expanding a time axis of the signal by a predetermined ratio.Type: GrantFiled: April 13, 1994Date of Patent: June 4, 1996Assignees: Hitachi Denshi Kabushiki Kaisha, Tohoku Electric Power Co., Inc., Fuji-Tekku Kabushiki KaishaInventors: Norio Takahashi, Nobuo Sekiguchi, Sakari Ohira, Fujio Sumi
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Patent number: 5518627Abstract: A method for demineralizing water or an aqueous solution, which comprises contacting the water or the aqueous solution to be treated to a strongly basic anion exchanger made of a crosslinked polymer having a constituting unit of the following formula (I): ##STR1## wherein A is a C.sub.1-2 linear alkylene group, B is a C.sub.4-8 linear alkylene group, each of R1, R2 and R3 which may be the same or different, is a C.sub.1-4 alkyl group or a C.sub.2-4 alkanol group, X is a counter ion coordinated on the ammonium group, and the benzene ring D may have an alkyl group or a halogen atom as a substituent.Type: GrantFiled: March 1, 1995Date of Patent: May 21, 1996Assignees: Mitsubishi Chemical Corporation, Tohoku Electric Power Co., Inc.Inventors: Masao Tomoi, Teruo Onozuka, Manabu Shindo, Hideaki Kiniwa, Hirohisa Kubota, Shintaro Sawada
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Patent number: 5508619Abstract: There is disclosed a surge discriminating and locating system having at least one master station and at least one slave station. The system comprises surge receiving means for receiving surges which occur on a power transmission line, locating means for locating a point where the surge occurs, digitizing means for digitizing said surge into a digital signal, extraction means for extracting from said digital signal the characterized portions thereof as information representative of the surge waveform, memory means for storing predetermined reference information concerning the nature of surges, and discriminating means for comparing said information representative of the surge wave form with said reference information stored in said memory means to discriminate the kind of surge.Type: GrantFiled: October 18, 1994Date of Patent: April 16, 1996Assignees: Kyokuto Boeki Kaisha, Tohoku Electric Power Co. Inc.Inventors: Masaaki Ozawa, Sakari Ohira
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Patent number: 5505827Abstract: An electrolyte such as a saturated picric acid solution in a cell for measuring electrochemical polarization is placed in contact with an alloy steel such as a CrMoV steel which has been subjected to a high-temperature and stress-applied condition, and a potential is swept between the CrMoV steel and a salt bridge in the cell, whereby the Mo-rich carbide M.sub.6 C undergoes a dissolution reaction at a potential near a specified value and this reaction is visible as the secondary anode peak current, or the second appearance of peak current on the waveform of electric polarization. Since the secondary anode peak current is closely related to the amount of M.sub.6 C precipitation, the progress of degradation in the CrMoV steel can be evaluated by a simple method with good precision.Type: GrantFiled: November 23, 1993Date of Patent: April 9, 1996Assignees: Fuji Electric Co., Ltd., Tohoku Electric Power Co., Inc.Inventors: Mitsuo Yamashita, Nobuo Kato, Naokatsu Sakuma, Terutsugu Watanabe
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Patent number: 5493698Abstract: A radio apparatus having a unit for receiving a first signal from a first transceiver compressed in time by a predetermined rate, a unit for reproducing a first original signal from the first signal, a unit for receiving a second signal from a second transceiver compressed by the predetermined rate during the reception period of the first transceiver, a unit for reproducing a second original signal from the second signal, and a unit for adding the first and second original signals and outputting the added signal.Type: GrantFiled: February 25, 1994Date of Patent: February 20, 1996Assignees: Hitachi Denshi Kabushiki Kaisha, Tohoku Electric Power Co., Inc., Fuji-Tekku Kabushiki KaishaInventors: Osamu Suzuki, Kazuo Suzuka, Mitsuo Shiraishi, Sakari Ohira, Fujio Sumi, Kenichi Suzuki
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Patent number: 5489194Abstract: A heavy-duty gas turbine includes a compressor; a combustion liner; a turbine blade in a single stage or multi-stages; and a turbine nozzle provided in correspondence to the turbine blade. The turbine blade has a dovetail secured to a turbine disk and has an overall length of not less than 180 mm, and it is made of a single-crystal Ni-base alloy whose .gamma. phase is a single crystal. Operating gas temperature is not less than 1400.degree. C., and metal temperature of a first blade is not less than 1000.degree. C. under working stress.Type: GrantFiled: August 15, 1994Date of Patent: February 6, 1996Assignees: Hitachi, Ltd., Tohoku Electric Power Co., Inc.Inventors: Akira Yoshinari, Tosiaki Saito, Katsumi Iijima, Tadami Ishida, Ryozo Hashida, Kimio Kano
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Patent number: 5446017Abstract: A superconductive oxide material having an infinite layer structure and having the following formula:A.sub.p B.sub.q Cu.sub.2 O.sub.4.+-.rwherein A and B are different and each represent an element selected from lanthanoid elements and elements belonging to Groups IA, IIA and IIIA of the Periodic Table, p is between 0.9 and 1.1, q is between 0.9 and 1.1 and r is between 0 and 0.6. The oxide material has a crystal structure belonging to a tetragonal system of P4/mmm and 1-123 having the following lattice parameters:3.8.ANG..ltoreq.a.ltoreq.4.0.ANG.7.6.ANG..ltoreq.c.ltoreq.8.0.ANG.or to an orthorhombic system of Pmmm and I-47 having the following lattice parmeters:3.8.ANG..ltoreq.a.ltoreq.3.95.ANG.3.82.ANG..ltoreq.b.ltoreq.4.0.ANG.7.6.ANG..ltoreq.c.ltoreq.8.0.ANG..Type: GrantFiled: April 12, 1993Date of Patent: August 29, 1995Assignees: Central Research Institute of Electric Power Industry, Tohoku Electric Power Co., Inc., International Superconductivity Technology CenterInventors: Takeshi Sakurai, Nobuyuki Sugii, Seiji Adachi, Michiharu Ichikawa, Yuji Yaegashi, Hisao Yamauchi, Masahiko Shimada, Hirotsugu Takizawa
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Patent number: 5350523Abstract: An anion exchange method conducted at a high temperature, which comprises using a crosslinked anion exchanger which comprises structural units having a quaternary ammonium group of the following formula (a) and structural units derived from an unsaturated hydrocarbon group-containing crosslinkable monomer, and of which at least 90% of anion exchange groups are present in the form of a group represented by ##STR1## as defined in the following formula (a): ##STR2## wherein R is a --(CH.sub.2).sub.n --group (n=an integer of from 3 to 18) which may include a cyclic hydrocarbon, each of R.sub.1, R.sub.2 and R.sub.3 which are independent from one another, is a C.sub.1 -C.sub.8 hydrocarbon group or a C.sub.1 -C.sub.8 alkanol group, the benzene ring of the formula (a) may be substituted by an alkyl group or a halogen atom, or may be condensed with other aromatic ring, and X is an anion.Type: GrantFiled: August 28, 1992Date of Patent: September 27, 1994Assignees: Mitsubishi Kasei Corporation, Tohoku Electric Power Co., Inc.Inventors: Masao Tomoi, Atsuo Kiyokawa, Hiromasa Ogawa, Teruo Onozuka, Tsuyoshi Ito
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Patent number: 5279760Abstract: According to the present invention there is provided a cleaning agent composition capable of removing the foulants deposited in gas turbine air compressors even during their operation and thereby cleaning the compressors.That is, there is provided a cleaning agent composition comprising(A) a solvent component consisting of a combination of a particular monovalent aliphatic alcohol-ethylene glycol adduct and a particular phenol-ethylene glycol adduct, and(B) a surfactant component consisting of a combination of a particular polyethylene glycol mono(alkylphenol) ether and an ammonium or amine salt of a particular fatty acid. Said composition is diluted with purified water and used for cleaning of gas turbine air compressors, particular their turbine blades.Type: GrantFiled: December 2, 1992Date of Patent: January 18, 1994Assignee: Tohoku Electric Power Co., Inc.Inventors: Tsuneo Sato, Akihisa Inomata, Minoru Horikawa, Yasushi Takizawa, Toshinobu Imahama, Yoshiaki Shibata
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Patent number: 5217945Abstract: The present invention provides an oxide superconductor which has a relatively high transition temperature T.sub.c. This superconductor has the chemical formula (R.sub.1-x Ca.sub.x)(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.3 O.sub.7-z wherein R is at least one rare earth element selected from the group consisting of Tm, Yb and Lu, x is with in the range of 0.1.ltoreq..times.0.5, y is within the range of 0.1.ltoreq. y .ltoreq.0.4 and z is within the range of 0.05 .ltoreq. z .ltoreq.(x/2+0.5). The invention further provides a method for producing the oxide superconductor which comprises firing a composition of the formula (R.sub.1-x Ca.sub.x)(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.3 O.sub.7-z wherein R is at least one rare earth element selected from the group consisting of Tm, Yb and Lu, x is within the range of 0.1 .ltoreq..times..ltoreq.0.5 and y is within the range of 0.1 .ltoreq.y .ltoreq.0.4 at a temperature of from 750.degree. C. to the melting temperature of the composition under an oxygen partial pressure P(O.sub.Type: GrantFiled: September 5, 1991Date of Patent: June 8, 1993Assignees: Matsushita Electric Industrial Co., Ltd., Tohoku Electric Power Co., Inc., Central Research Institute of Electric Power Industry, The Tokyo Electric Power Co., Inc., International Superconductivity Technology CenterInventors: Takahiro Wada, Yuji Yaegashi, Ataru Ichinose, Nobuo Suzuki, Hisao Yamauchi, Shoji Tanaka
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Patent number: 5149683Abstract: A method for producing an oxide superconductor formed according to a chemical composition formula (R.sub.1-x Ca.sub.x)(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.4 O.sub.8 and having a transition temperature of 77K or above, comprising the step of causing a reaction between (R.sub.1-x Ca.sub.x)(Ba.sub.1-y Sr.sub.y).sub.2 Cu.sub.3 O.sub.7-z and a Cu material such as CuO, wherein R stands for one or more rare earth elements selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm and Yb, and wherein 0.01.ltoreq.x.ltoreq.0.25, 0.ltoreq.y.ltoreq.0.5, and 0.ltoreq.z.ltoreq.1. The advantage of this production method is that this production method does not require a hot static pressing process which takes a long time.Type: GrantFiled: February 11, 1991Date of Patent: September 22, 1992Assignees: Matsushita Electric Industrial Co., Ltd., The Tokyo Electric Power Co., Inc., Central Research Institute of Electric Power Industry, Tohoku Electric Power Co., Inc., International Superconductivity Technology CenterInventors: Takahiro Wada, Nobuo Suzuki, Ataru Ichinose, Yuji Yaegashi, Hisao Yamauchi, Shoji Tanaka
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Patent number: 5070537Abstract: The invention relates to a system for detecting any defective point on a power transmission line by making use of highly-accurate time signal transmitted from a satellite and by utilizing a digital data processing system.Type: GrantFiled: November 24, 1989Date of Patent: December 3, 1991Assignees: Tohoku Electric Power Co., Inc., Kyokuto Boeki Kaisha, Ltd.Inventors: Sakari Ohira, Masatoshi Yamaki, Akira Terashima, Masaaki Ozawa
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Patent number: 4662712Abstract: A non-metallic self-supporting aerial optical cable is comprised of a suspension wire and optical cable which are made of non-metallic material and have non-metallic sheaths. The optical cable and suspension wire are maintained substantially parallel by a number of spaced apart connecting members. The optical cable is allowed to sag between the connecting members in order to withstand tensile forces which result from wind, snow and the like.Type: GrantFiled: December 19, 1983Date of Patent: May 5, 1987Assignees: Tohoku Electric Power Co., Inc., Sumitomo Electric Industries, Ltd., Kitanihon Electric Wire Co.Inventors: Yusuke Tabata, Eiji Hayasaka, Toshitomo Hashimoto, Hiroaki Horima, Toshiyuki Omori, Akira Kurosawa
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Patent number: 4331034Abstract: An annular guide rail is detachably mounted in enclosing relation around a tubular member of piping to be probed for any flaws that might be present therein, and a flaw detecting unit, a circumferentially driving unit and an axially driving unit are movably arranged on the annular guide rail and interconnected by connecting means. The flaw detecting means includes an arm movable axially of the tubular member and supporting ultrasonic flaw detecting means. The circumferentially driving unit includes first driving means for moving the flaw detecting unit, circumferentially driving unit and axially driving unit circumferentially along the guide rail. The axially driving unit includes second driving means for moving the arm axially of the tubular member. A transmission mechanism is provided for transmitting the operation of the second driving means to the arm.Type: GrantFiled: August 6, 1979Date of Patent: May 25, 1982Assignees: The Chugoku Electric Power Co., Inc., Tohoku Electric Power Co., Inc., The Tokyo Electric Power Co., Inc., The Chubu Electric Power Co., Inc., Hitachi, Ltd.Inventors: Hiroyuki Takeda, Ichio Iseki, Katsumi Kawai, Hiroyuki Okajima, Sigeru Kajiyama, Sakae Sugiyama, Kimio Kanda