Patents by Inventor Tsuyoshi Takizawa
Tsuyoshi Takizawa 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: 5525458Abstract: A desensitizing solution for lithographic platemaking which mainly comprises phytic acid or a salt thereof is disclosed, said desensitizing solution containing a polyether polyamine or a derivative thereof represented by formula (I): ##STR1## wherein k, m, x, and y each represent an integer of 1 or more; and R.sub.1 represents a hydrogen atom or C.sub.n H.sub.2n R.sub.2, wherein n is an integer of 1 or more, and R.sub.2 represents a hydrogen atom, an NR.sub.3 R.sub.4 (wherein R.sub.3 and R.sub.4 each represent a hydrogen atom or an alkyl group), a chlorine atom, a fluorine atom, an iodine atom, a bromine atom, a hydroxyl group, a carboxyl group or a carbamoyl group,or a polyamine derivative represented by formula (II): ##STR2## wherein X represents a halogen atom; p and each represent an integer of from 2 to 6; and r represents an integer of from 3 to 2000. The desensitizing solution exhibits satisfactory desensitizing characteristics without causing environmental pollution.Type: GrantFiled: September 2, 1994Date of Patent: June 11, 1996Assignee: Tomoegawa Paper Co., Ltd.Inventor: Tsuyoshi Takizawa
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Patent number: 5471869Abstract: A combustion state-detecting system for an internal combustion engine is provided, which detects misfires occurring in the engine. A crank angle sensor generates a crank angle signal with a predetermined period shorter than a firing period of the engine whenever the crankshaft rotates through a predetermined angle. An ECU detects the rotational speed of the engine, based on the crank angle signal whenever the crank angle signal is generated to generate a rotational speed signal, and filters the rotational speed signal to extract a specific frequency component therefrom. A rate of variation in the extracted specific frequency component is calculated every first predetermined time period, and an average value of the rate of variation is calculated every second predetermined time period longer than the first predetermined time period.Type: GrantFiled: September 9, 1994Date of Patent: December 5, 1995Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Shigetaka Kuroda, Toshihiko Sato, Tsuyoshi Takizawa
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Patent number: 5437154Abstract: A misfire-detecting system for an internal combustion engine has an ECU which detects a value of a parameter representative of a misfiring state of the engine, and also detects the deterioration degree of a catalytic converter arranged in the engine exhaust system. The ECU sets a misfire-determining reference value, based on the detected deterioration degree of the catalytic converter, compares between the detected value of the above parameter and the misfire-determining reference value, and determines whether the engine is in a misfiring state, based on the result of the comparison.Type: GrantFiled: March 9, 1994Date of Patent: August 1, 1995Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Toshihiko Sato, Tsuyoshi Takizawa, Yoichi Iwata, Hiroshi Ito, Takayoshi Nakayama
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Patent number: 5406789Abstract: An air-fuel ratio control system for an internal combustion engine having a catalytic converter arranged in the exhaust system, and an air-fuel ratio sensor arranged upstream of the catalytic converter calculates an air-fuel ratio correction amount by means of proportional control and integral control based on an output from the air-fuel ratio sensor, and controls an air-fuel ratio of a mixture supplied to the engine, based on the air-fuel ratio correction amount. A control frequency at which the air-fuel ratio control is carried out is increased when deterioration of the catalytic converter is detected.Type: GrantFiled: October 15, 1993Date of Patent: April 18, 1995Assignee: Honda Giken Kogyo K.K.Inventors: Tsuyoshi Takizawa, Hiroshi Ito, Yoichi Iwata, Toshihiko Sato, Naoki Iida, Takayoshi Nakayama
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Patent number: 5396765Abstract: The air-furl ratio of an air-fuel mixture supplied to an internal combustion engine is controlled in response to an output from at least one oxygen sensor arranged in an exhaust passage for detecting concentration of oxygen present in exhaust gases. The deterioration of the at least one oxygen sensor is detected based on the output therefrom. When the engine is detected to be in a predetermined abnormal operating state, it is not permitted to monitor the output from the oxygen sensor for detecting deterioration thereof.Type: GrantFiled: July 28, 1993Date of Patent: March 14, 1995Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Hiroshi Maruyama, Tsuyoshi Takizawa, Toshihiko Sato, Hiroshi Ito, Yasunari Seki, Takayoshi Nakayama
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Patent number: 5396766Abstract: An abnormality-detecting device is provided for an internal combustion engine having first and second oxygen sensors arranged in the exhaust system at locations upstream and downstream of a catalytic converter. An ECU detects the degree of deterioration of the catalytic converter, based on an output from the second oxygen sensor, and sets a reference value for determining an abnormality in the engine, based on the detected degree of deterioration of the catalytic converter. The ECU compares between the set reference value and a value based on an output from the first oxygen sensor, and determines the abnormality in the engine, based on the result of the comparison. Upon detection of the abnormality, an LED is actuated to issue an alarm.Type: GrantFiled: July 29, 1993Date of Patent: March 14, 1995Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Toshihiko Sato, Yoichi Iwata, Hiroshi Ito, Tsuyoshi Takizawa, Takayoshi Nakayama
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Patent number: 5386695Abstract: An air-fuel ratio control system for an internal combustion engine having a catalytic converter arranged in the exhaust system, and first and second air-fuel ratio sensors arranged upstream and downstream of the catalytic converter respectively has an ECU which calculates an air-fuel ratio correction amount, based at least on an output from the first air-fuel ratio sensor, and detects deterioration of the catalytic converter, based on an output from the second air-fuel ratio sensor when the engine is in a predetermined operating condition. The ECU inhibits detection of deterioration of the catalytic converter when the air-fuel ratio correction amount falls outside a predetermined range.Type: GrantFiled: January 21, 1994Date of Patent: February 7, 1995Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Yoichi Iwata, Toshihiko Sato, Yasunari Seki, Tsuyoshi Takizawa, Takayoshi Nakayama
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Patent number: 5381657Abstract: A catalyst deterioration-detecting system is provided for an internal combustion engine having an oxygen concentration sensor arranged in an exhaust system downstream of a catalyst provided therein. An electronic control unit (ECU) controls the air-fuel ratio of a mixture supplied to the engine in response to an output from the oxygen concentration sensor. The ECU detects a value of an inversion period with which the output from the oxygen concentration sensor is inverted with respect to a predetermined reference value. Operating parameter sensors detect a value of at least one operating parameter of the engine related to a flow rate of the exhaust gases in the exhaust system. The ECU determines whether the catalyst is deteriorated, based on the detected value of the inversion period and the detected value of the at least one operating parameter. The ECU corrects the value of the inversion period in dependence on the detected value of the at least one operating parameter.Type: GrantFiled: January 21, 1994Date of Patent: January 17, 1995Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Tsuyoshi Takizawa, Yasunari Seki, Yoichi Iwata, Toshihiko Sato, Takayoshi Nakayama
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Patent number: 5379591Abstract: An air-fuel ratio control system for an internal combustion engine calculates an air-fuel ratio feedback control parameter by proportional-integral control using a proportional factor and an integral factor, based an output signal from a second air-fuel ratio sensor arranged in an exhaust passage at a location upstream of a catalytic converter. An air-fuel ratio correction amount is calculated based on the air-fuel ratio feedback control parameter and an output signal from a first air-fuel ratio sensor arranged in the exhaust passage at a location upstream of the catalytic converter. An inversion period of the output signal from the second air-fuel ratio sensor is measured, and the proportional factor is changed according to the inversion period measured.Type: GrantFiled: January 28, 1994Date of Patent: January 10, 1995Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Yoichi Iwata, Naoki Iida, Tsuyoshi Takizawa, Yasunari Seki, Toshihiko Sato, Takayoshi Nakayama
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Patent number: 5375416Abstract: An air-fuel ratio sensor deterioration-detecting device for an internal combustion engine having a catalytic converter arranged in the exhaust system, and first and second air-fuel ratio sensors arranged upstream and downstream of the catalytic converter respectively has an ECU which calculates an air-fuel ratio correction amount, based on outputs from the first air-fuel ratio sensors, and detects deterioration of the first air-fuel ratio sensor, based on the output from the first air-fuel ratio sensor. The ECU inhibits detection of deterioration of the first air-fuel ratio sensor when the air-fuel ratio correction amount falls outside a predetermined range.Type: GrantFiled: January 21, 1994Date of Patent: December 27, 1994Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Yoichi Iwata, Toshihiko Sato, Yasunari Seki, Tsuyoshi Takizawa, Takayoshi Nakayama
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Patent number: 5355864Abstract: An evaporative fuel-processing system for an internal combustion engine, in which a first control valve is arranged across an evaporative fuel-guiding passage extending from a fuel tank to a canister, a second control valve across a purging passage extending from the canister to the intake system of the engine, and a third control valve at an air inlet port of the canister, respectively. An ECU generates operation command signals to the first to third control valves for closing or opening the same. The ECU is responsive to an output from a tank internal pressure sensor which detects pressure within the fuel tank and the operation command signals, for detecting an abnormality in operation of a predetermined one of the first to third control valves.Type: GrantFiled: December 27, 1993Date of Patent: October 18, 1994Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Shigetaka Kuroda, Kazutomo Sawamura, Hiroshi Maruyama, Masayoshi Yamanaka, Yoichi Iwata, Tsuyoshi Takizawa
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Patent number: 5325664Abstract: A catalyst deterioration-determining system determines deterioration of a catalyst arranged in the exhaust passage of an internal combustion engine. An ECU is responsive to an output from an O.sub.2 sensor arranged upstream of the catalyst or outputs from O.sub.2 sensors arranged upstream and downstream of the catalyst for controlling the air-fuel ratio of a mixture supplied to the engine by means of an air-fuel ratio correction value (first air-fuel ratio control). When the engine is in a predetermined operating condition, the system effects changeover from the first air-fuel ratio control to a second air-fuel ratio control which is responsive to the output from the downstream O.sub.2 sensor for controlling the air-fuel ratio of the mixture by means of the air-fuel ratio correction value.Type: GrantFiled: October 16, 1992Date of Patent: July 5, 1994Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Yasunari Seki, Toshihiko Sato, Katuhiro Kumagai, Hiroshi Maruyama, Yoichi Iwata, Tsuyoshi Takizawa, Kenichi Maeda, Shigetaka Kuroda, Masataka Chikamatsu, Shukoh Terata, Kazutomo Sawamura, Hajime Uto, Takuya Aoki, Makoto Kobayashi