Patents by Inventor Akira Tokuda
Akira Tokuda 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: 7932957Abstract: A receiver apparatus 3 has a digital circuit portion 13 that converts a compressed digital signal outputted from a digital demodulating portion 12 into digital video and audio signals and a video/audio output circuit 14 that converts the digital video and audio signals outputted from the digital circuit portion 13 into analog video and audio signals. With this configuration, a video/audio processing IC for digital signal processing no longer needs to be mounted on the circuit board of a video display apparatus 4, and thus a receiver system can be realized with a video display apparatus having a simple configuration.Type: GrantFiled: September 11, 2006Date of Patent: April 26, 2011Assignee: Sharp Kabushiki KaishaInventors: Hitoshi Azuma, Tsutomu Jitsuhara, Miyoshi Yamauchi, Toyomi Yonemaru, Hitoshi Ogino, Akio Ito, Junichi Somei, Akira Tokuda, Youichi Yuuki
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Patent number: 7880817Abstract: A receiver apparatus 3 has a digital circuit portion 13 that converts a compressed digital signal outputted from a digital demodulating portion 12 into digital video and audio signals and a video/audio output circuit 14 that converts the digital video and audio signals outputted from the digital circuit portion 13 into analog video and audio signals. With this configuration, a video/audio processing IC for digital signal processing no longer needs to be mounted on the circuit board of a video display apparatus 4, and thus a receiver system can be realized with a video display apparatus having a simple configuration.Type: GrantFiled: August 18, 2006Date of Patent: February 1, 2011Assignee: Sharp Kabushiki KaishaInventors: Tsutomu Jitsuhara, Miyoshi Yamauchi, Toyomi Yonemaru, Hitoshi Ogino, Akio Ito, Junichi Somei, Akira Tokuda, Youichi Yuuki
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Publication number: 20070058093Abstract: A receiver apparatus 3 has a digital circuit portion 13 that converts a compressed digital signal outputted from a digital demodulating portion 12 into digital video and audio signals and a video/audio output circuit 14 that converts the digital video and audio signals outputted from the digital circuit portion 13 into analog video and audio signals. With this configuration, a video/audio processing IC for digital signal processing no longer needs to be mounted on the circuit board of a video display apparatus 4, and thus a receiver system can be realized with a video display apparatus having a simple configuration.Type: ApplicationFiled: September 11, 2006Publication date: March 15, 2007Applicant: SHARP KABUSHIKI KAISHAInventors: Hitoshi Azuma, Tsutomu Jitsuhara, Miyoshi Yamauchi, Toyomi Yonemaru, Hitoshi Ogino, Akio Ito, Junichi Somei, Akira Tokuda, Youichi Yuuki
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Publication number: 20070046831Abstract: A receiver apparatus 3 has a digital circuit portion 13 that converts a compressed digital signal outputted from a digital demodulating portion 12 into digital video and audio signals and a video/audio output circuit 14 that converts the digital video and audio signals outputted from the digital circuit portion 13 into analog video and audio signals. With this configuration, a video/audio processing IC for digital signal processing no longer needs to be mounted on the circuit board of a video display apparatus 4, and thus a receiver system can be realized with a video display apparatus having a simple configuration.Type: ApplicationFiled: August 18, 2006Publication date: March 1, 2007Applicant: SHARP KABUSHIKI KAISHAInventors: Tsutomu Jitsuhara, Miyoshi Yamauchi, Toyomi Yonemaru, Hitoshi Ogino, Akio Ito, Junichi Somei, Akira Tokuda, Youichi Yuuki
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Publication number: 20040185526Abstract: The invention relates to a process for the preparation of N-benzyloxycarbonyl-&agr;-L-aspartyl-L-phenylalanine methyl ester (Z-APM) by high-conversion enzymatic coupling of N-benzyloxycarbonyl-L-aspartic acid (Z-Asp) and L-phenylalanine methyl ester (L-PM) in a reaction mixture comprising an aqueous medium, a neutral protease as enzyme and an alkali metal salt, alkaline earth metal salt or ammonium salt, with formation of a precipitate. The enzymatic coupling of Z-Asp and L-PM is carried out in a continuous or fed-batch process at a pH of from 5.0 to 6.5 and an average charged molar ratio of Z-Asp and L-PM between 1:1 and 2:1 and wherein the actual molar ratio of Z-Asp and L-PM is higher than the average charge molar ratio. Preferably the alkali metal salt, alkaline earth metal salt or ammonium salt is present in an amount of from 3 to 25%, calculated as % by weight based on the total reaction mixture.Type: ApplicationFiled: May 13, 2004Publication date: September 23, 2004Inventors: Akira Tokuda, Shinichiro Nakamura, Norihiro Yamamoto, Peter J.L.M. Quaedflieg
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Patent number: 6008403Abstract: A method for producing an optically active amino acid or derivative thereof having a high optical purity from an optically active amino acid comprising optical isomers or derivative thereof, which comprises any one of processes (A), (B), and (C), wherein the process (A) comprises the steps: (1) previously preparing an optically active amino acid or derivative thereof having an optical purity higher than a convergent value of a mutual solubility of the optical isomers and (2) crystallizing the optically active amino acid or the derivative thereof that exists in excess, said convergent value being a ratio of the desired optical isomer in the optical isomers dissolved in a mother liquor in which crystals of a racemate and an optically active compound coexist at equilibrium (the optical purity in a mother liquor). The processes (B) and (C) are described in the specification.Type: GrantFiled: September 26, 1997Date of Patent: December 28, 1999Assignee: Tosoh CorporationInventors: Kimio Katsuura, Shigeaki Irino, Akira Tokuda
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Patent number: 4944852Abstract: A method for purifying a dipeptide ester by electrolysis in an electrolytic cell comprising an anode compartment, a cathode compartment and a central compartment partitioned by anion exchange membranes, which comprises supplying an aqueous dipeptide ester solution containing an inorganic acid to the central compartment defined by said anion exchange membranes, an aqueous solution containing a basic substance or an aqueous electrolyte solution containing a basic substance to the cathode compartment and an aqueous electrolyte solution to the anode compartment, supplying hydroxyl ions from the cathode compartment to the central compartment through the anion exchange membrane to neutralize the aqueous dipeptide ester solution containing the inorganic acid and removing anions of the inorganic acid in the aqueous dipeptide ester solution from the central compartment to the anode compartment through the anion exchange membrane.Type: GrantFiled: August 5, 1988Date of Patent: July 31, 1990Assignee: Tosoh CorporationInventors: Yasuhiro Kurauchi, Michihiro Akazawa, Tsuneo Harada, Kiyotaka Oyama, Akira Tokuda
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Patent number: 4835303Abstract: A process for producing dry .alpha.-L-aspartyl-L-phenylalanine methyl ester, which comprises drying wet crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester by means of an air having an absolute humidity of at least 0.015 kg/kg or at most 0.01 kg/kg.Type: GrantFiled: August 11, 1987Date of Patent: May 30, 1989Assignee: Toyo Soda Manufacturing Company, Ltd.Inventors: Hideotoshi Wakamatsu, Shigeaki Irino, Tsuneo Harada, Akira Tokuda, Kiyotaka Oyama
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Patent number: 4835301Abstract: A process for producing stable .alpha.-L-aspartyl-L-phenylalanine methyl ester, which comprises heat-treating crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester having a water content of from 5 to 15% by weight based on wet crystals, at a temperature of higher than 50.degree. C. and lower than 80.degree. for at least 30 minutes.Type: GrantFiled: August 11, 1987Date of Patent: May 30, 1989Assignee: Toyo Soda Manufacturing Co., Ltd.Inventors: Hidetoshi Wakamatsu, Shigeaki Irino, Tsuneo Harada, Akira Tokuda, Kiyotaka Oyama
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Patent number: 4831180Abstract: A process for producing dry .alpha.-L-aspartyl-L-phenylalanine methyl ester having an improved solubility by drying wet crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester, characterized in that the wet crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester are granulated so that the specific surface area during the drying operation is at least 4 m.sup.2 /g, followed by drying.Type: GrantFiled: August 11, 1987Date of Patent: May 16, 1989Assignee: Toyo Soda Manufacturing Company, Ltd.Inventors: Hidetoshi Wakamatsu, Shigeaki Irino, Tsuneo Harada, Akira Tokuda, Hiyotaka Oyama
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Patent number: 4830720Abstract: A method for purifying a dipeptide ester by electrolysis in an electrolytic cell comprising an anode compartment, a cathode compartment and a central compartment partitioned by ion exchange membranes, which comprises supplying an aqueous dipeptide ester solution containing organic acids to the central compartment defined by anion and cation exchange membranes or by anion exchange membranes and an aqueous electrolyte solution to the cathode and anode compartments, and electrically removing the organic acids from the central compartment to the anode compartment through the anion exchange membrane.Type: GrantFiled: October 26, 1988Date of Patent: May 16, 1989Assignee: Tosoh CorporationInventors: Tsuneo Harada, Ken-ichi Fukuda, Hiroshi Shimizu, Akira Tokuda, Kiyotaka Oyama
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Patent number: 4810818Abstract: A process for producing dry .alpha.-L-aspartyl-L-phenylalanine methyl ester having an improved solubility from wet crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester having a water content of at least 20% by weight, which comprises drying the wet crystals at a temperature of higher than 50.degree. C. to obtain moist crystals having a water content of less than 20 and more than 15% by weight, then drying the moist crystals at a temperature of not higher than 50.degree. C. to obtain semi-dry crystals having a water content of less than 5% by weight, and further drying the semi-dry crystals at a temperature of higher than 50.degree. C. to obtain dry crystals of .alpha.-L-aspartyl-L-phenylalanine methyl ester.Type: GrantFiled: July 28, 1987Date of Patent: March 7, 1989Assignee: Toyo Soda Manufacturing Co., LtdInventors: Hidetoshi Wakamatsu, Shigeaki Irino, Tsuneo Harada, Akira Tokuda, Kiyotaka Oyama
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Patent number: 4463724Abstract: A method for controlling the air-fuel ratio in a carburetor which prevents fuel from flowing into an air bleed passage at nearly fully closed position of the tapered needle valve fitted with the air bleed passage by controlling the step motor connected to the needle valve so as to maintain the minimum amount of bleed air at a constant level. In another aspect, at nearly fully closed position of the needle valve, this invention is effective to prevent fuel from flowing into the air bleed passage by continously driving the step motor in a direction of its fully closed position to axially vibrate the needle valve so that the minimum amount of bleed air may be maintained at a constant level.Type: GrantFiled: April 9, 1982Date of Patent: August 7, 1984Assignee: Aisan Kogyo Kabushiki KaishaInventors: Kastuyoshi Fukaya, Akira Tokuda, Hitoshi Hirano
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Patent number: 4385339Abstract: A method of driving a valve in an injector for an internal combustion engine which intermittently injects liquid fuel by the valve reciprocally moving by attraction force of a solenoid coil and repulsive force of a spring and an apparatus for carrying out the method. An armature secured to the valve to be attracted by the solenoid coil and/or an iron core of the solenoid coil is made of a permanent magnet. The pulse shape of an electric current to be applied to the solenoid coil is made in the form of a stepped wave in which the electric power in the initial stage of application is larger than that in the later stage. An inverse pulse for inversely exciting the solenoid coil is formed to give the permanent magnet of the armature repulsive force upon fall of the pulse wave of the electric current applied to the solenoid coil.Type: GrantFiled: November 7, 1980Date of Patent: May 24, 1983Assignees: Aisan Kogyo Kabushiki Kaisha, Yoshiro IwamaInventors: Shigetaka Takada, Akira Tokuda, Yoshiro Iwama
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Patent number: 4108123Abstract: A carburetor for use with a stratified charge rotary piston engine including a first supply system having a main fuel supply system and a slow/idle fuel supply system and adapted to supply a fuel-air mixture and a second supply system adapted to supply only air, wherein a second slow/idle supply system is provided to supply an additional fuel when an engine is operating in a slow speed or idling condition and/or the exhaust gas temperature of the engine is below a predetermined value.Type: GrantFiled: March 29, 1977Date of Patent: August 22, 1978Assignees: Toyota Jidosha Kogyo Kabushiki Kaisha, Aisan Kogyo Kabushiki KaishaInventors: Ryozo Ito, Akira Tokuda