Patents by Inventor Takehisa Kato
Takehisa Kato 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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Publication number: 20230046253Abstract: A solid electrolyte is composed of a compound represented by the general formula LixM2(PO4)z where M represents at least one element having a valence of one to four, x represents a number that satisfies 0.800?x?1.900, and z represents a number that satisfies 2.600?z?2.800.Type: ApplicationFiled: November 30, 2020Publication date: February 16, 2023Applicant: TDK CORPORATIONInventors: Kazumasa TANAKA, Takehisa KATO
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Patent number: 11274417Abstract: A hydraulic drive system of a construction machine includes: a boom control valve connected to a boom cylinder by a boom raising supply line and a boom lowering supply line; a pump that sucks hydraulic oil through a suction line, and delivers the hydraulic oil through a delivery line; a regenerative valve that brings the boom raising supply line and the suction line into communication with each other through a regenerative line when a boom lowering operation is performed; and a controller that controls an accumulator switching valve. The controller: switches the accumulator switching valve to a pressure accumulation position when a pressure accumulation condition is satisfied; switches the accumulator switching valve to a pressure release position when a pressure release condition is satisfied; and switches the accumulator switching valve to a neutral position when neither the pressure accumulation condition nor the pressure release condition is satisfied.Type: GrantFiled: September 11, 2018Date of Patent: March 15, 2022Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro Kondo, Yoji Yudate, Takehisa Kato
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Patent number: 11035100Abstract: A hydraulic drive system of a construction machine includes: an over-center pump connected to a turning motor; a regulator that adjusts tilting angle of the over-center pump; a main pump coupled to over-center pump; and a controller that controls the regulator such that when a turning deceleration operation is performed, the over-center pump's tilting angle decreases in accordance with decrease in a turning operation signal outputted from a turning operation device. The controller: when a pressure accumulation condition satisfied, switches a switching valve to pressure accumulation position to bring an accumulator into communication with a delivery line of the main pump; when a pressure release condition is satisfied, switches the switching valve to a pressure release position to bring accumulator into communication with a suction line of main pump; and when neither the pressure accumulation condition nor pressure release condition is satisfied, switches the switching valve to a neutral position.Type: GrantFiled: September 11, 2018Date of Patent: June 15, 2021Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro Kondo, Takehisa Kato
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Patent number: 10900199Abstract: A drive system of a construction machine includes: a controller that controls a fuel injection valve, so an actual rotation speed of an engine is adjusted to a setting rotation speed; a hydraulic circuit including a boom cylinder supplied with hydraulic oil from a pump driven by the engine, configured so energy is regenerated as motive power owing to the pump being driven by pressurized oil discharged from the boom cylinder at boom lowering; and a boom operation device including a boom operation lever. At boom lowering, the controller cuts a fuel supply to the engine when a cutting condition is satisfied, which is defined to include that an operating amount of the lever is less than or equal to a first threshold, and resumes the fuel supply when the cutting condition stops being satisfied or when the actual rotation speed of the engine becomes less than a second threshold.Type: GrantFiled: November 8, 2018Date of Patent: January 26, 2021Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro Kondo, Takehisa Kato, Hideyasu Muraoka
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Publication number: 20200347575Abstract: A drive system of a construction machine includes: a controller that controls a fuel injection valve, so an actual rotation speed of an engine is adjusted to a setting rotation speed; a hydraulic circuit including a boom cylinder supplied with hydraulic oil from a pump driven by the engine, configured so energy is regenerated as motive power owing to the pump being driven by pressurized oil discharged from the boom cylinder at boom lowering; and a boom operation device including a boom operation lever. At boom lowering, the controller cuts a fuel supply to the engine when a cutting condition is satisfied, which is defined to include that an operating amount of the lever is less than or equal to a first threshold, and resumes the fuel supply when the cutting condition stops being satisfied or when the actual rotation speed of the engine becomes less than a second threshold.Type: ApplicationFiled: November 8, 2018Publication date: November 5, 2020Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro KONDO, Takehisa KATO, Hideyasu MURAOKA
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Publication number: 20200277755Abstract: A hydraulic drive system of a construction machine includes: a boom control valve connected to a boom cylinder by a boom raising supply line and a boom lowering supply line; a pump that sucks hydraulic oil through a suction line, and delivers the hydraulic oil through a delivery line; a regenerative valve that brings the boom raising supply line and the suction line into communication with each other through a regenerative line when a boom lowering operation is performed; and a controller that controls an accumulator switching valve. The controller: switches the accumulator switching valve to a pressure accumulation position when a pressure accumulation condition is satisfied; switches the accumulator switching valve to a pressure release position when a pressure release condition is satisfied; and switches the accumulator switching valve to a neutral position when neither the pressure accumulation condition nor the pressure release condition is satisfied.Type: ApplicationFiled: September 11, 2018Publication date: September 3, 2020Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro KONDO, Yoji YUDATE, Takehisa KATO
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Publication number: 20200217046Abstract: A hydraulic drive system of a construction machine includes: an over-center pump connected to a turning motor; a regulator that adjusts tilting angle of the over-center pump; a main pump coupled to over-center pump; and a controller that controls the regulator such that when a turning deceleration operation is performed, the over-center pump's tilting angle decreases in accordance with decrease in a turning operation signal outputted from a turning operation device. The controller: when a pressure accumulation condition satisfied, switches a switching valve to pressure accumulation position to bring an accumulator into communication with a delivery line of the main pump; when a pressure release condition is satisfied, switches the switching valve to a pressure release position to bring accumulator into communication with a suction line of main pump; and when neither the pressure accumulation condition nor pressure release condition is satisfied, switches the switching valve to a neutral position.Type: ApplicationFiled: September 11, 2018Publication date: July 9, 2020Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro KONDO, Takehisa KATO
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Patent number: 10612212Abstract: A hydraulic excavator drive system includes: a control valve for a cylinder that swings a swinging unit; an operation device that outputs an operation signal in accordance with an inclination angle of an operating lever when receiving a first operation of moving the swinging unit closer to a cabin or a second operation of moving the swinging unit farther from the cabin; a solenoid proportional valve connected to a first pilot port of the control valve, the first pilot port being intended for the first operation; and a controller that, when the operation device receives the first operation, controls the solenoid proportional valve such that: a pilot pressure outputted from the solenoid proportional valve is proportional to the operation signal outputted from the operation device until the pilot pressure reaches an upper limit pressure; and the closer the swinging unit to the cabin, the higher the upper limit pressure.Type: GrantFiled: September 21, 2017Date of Patent: April 7, 2020Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro Kondo, Takehisa Kato
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Patent number: 10167613Abstract: A pump that supplies hydraulic oil to a boom cylinder and a turning hydraulic motor; a regenerative hydraulic motor is coupled to the pump and to which the hydraulic oil discharged from the boom cylinder at a time of boom lowering and/or the hydraulic oil discharged from the turning hydraulic motor at a time of turning deceleration is/are led; an engine drives the pump; an alternator mounted to the engine and operable to rotate an output shaft of the engine when electric power is supplied to the alternator; an electrical storage device connected to the alternator; a power converter interposed between the alternator and the electrical storage device; and a controller that switches the power converter to either a servo-on state or a servo-off state and that controls the power converter either in a charging mode or in a discharging mode when switching the power converter to the servo-on state.Type: GrantFiled: December 7, 2015Date of Patent: January 1, 2019Assignee: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro Kondo, Yoji Yudate, Takehisa Kato
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Publication number: 20180080196Abstract: A hydraulic excavator drive system includes: a control valve for a cylinder that swings a swinging unit; an operation device that outputs an operation signal in accordance with an inclination angle of an operating lever when receiving a first operation of moving the swinging unit closer to a cabin or a second operation of moving the swinging unit farther from the cabin; a solenoid proportional valve connected to a first pilot port of the control valve, the first pilot port being intended for the first operation; and a controller that, when the operation device receives the first operation, controls the solenoid proportional valve such that: a pilot pressure outputted from the solenoid proportional valve is proportional to the operation signal outputted from the operation device until the pilot pressure reaches an upper limit pressure; and the closer the swinging unit to the cabin, the higher the upper limit pressure.Type: ApplicationFiled: September 21, 2017Publication date: March 22, 2018Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro KONDO, Takehisa KATO
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Publication number: 20170342685Abstract: A pump that supplies hydraulic oil to a boom cylinder and a turning hydraulic motor; a regenerative hydraulic motor is coupled to the pump and to which the hydraulic oil discharged from the boom cylinder at a time of boom lowering and/or the hydraulic oil discharged from the turning hydraulic motor at a time of turning deceleration is/are led; an engine drives the pump; an alternator mounted to the engine and operable to rotate an output shaft of the engine when electric power is supplied to the alternator; an electrical storage device connected to the alternator; a power converter interposed between the alternator and the electrical storage device; and a controller that switches the power converter to either a servo-on state or a servo-off state and that controls the power converter either in a charging mode or in a discharging mode when switching the power converter to the servo-on state.Type: ApplicationFiled: December 7, 2015Publication date: November 30, 2017Applicant: KAWASAKI JUKOGYO KABUSHIKI KAISHAInventors: Akihiro KONDO, Yoji YUDATE, Takehisa KATO
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Patent number: 9129262Abstract: A purchaser apparatus stores “anonymous order information including an order ID and purchaser identity verifying information” and “purchaser identity proving secret information”. A shop apparatus stores “anonymous order information including an order ID and purchaser identity verifying information”. If necessary, a purchaser sends a request including an order ID and zero knowledge proving information that a purchaser knows the purchaser identity proving secret information, from a purchaser apparatus to a shop apparatus. A shop apparatus verifies the zero knowledge proving information, based on purchaser identity verifying information retrieved from an order ID included in the request. Therefore, the unlinkability for past use is eliminated if necessary, and inconvenience caused by the unlinkability is eliminated.Type: GrantFiled: December 21, 2007Date of Patent: September 8, 2015Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA SOLUTIONS CORPORATIONInventors: Takuya Yoshida, Minako Tada, Norikazu Hosaka, Koji Okada, Takehisa Kato
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Patent number: 8397291Abstract: A device that relieves a service provider of the burden of managing personal information. A group administration organization device admits a user device to an authorized group by request and sends authority permission information to the user device. The user device holds the authority permission information received from the group administration organization device and, on access, sends authority proof information created from the authority permission information using a group signature scheme to a service provider device as requested by it. The service provider device, upon being accessed, requests the authority proof information and verifies the authority proof information received from the user device in accordance with the request on the basis of the group signature scheme. When the verification result indicates validity, the service provider device provides a service.Type: GrantFiled: February 23, 2007Date of Patent: March 12, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Shingo Miyazaki, Takehisa Kato
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Patent number: 8184807Abstract: A content distribution/browsing system is disclosed. First to (m?1)th encrypted content items E(K1, C1?K2,1), . . . , E(Km?1, Cm?1?Km,1) contain second to m-th (next in order) sharing keys K2,1, . . . , Km,1, respectively. When desirous of browsing an (i+1)th content item Ci+1, the (i+1)th sharing key Ki+1,1 is acquired by browsing an immediately preceding i-th content item Ci.Type: GrantFiled: June 5, 2008Date of Patent: May 22, 2012Assignees: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventors: Takehisa Kato, Koji Okada, Norikazu Hosaka, Yoshihiro Fujii, Minako Tada
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Patent number: 8077863Abstract: A secret sharing apparatus according to the present invention is based on a (k,n)-threshold scheme with a threshold of at least 4 but is still operational with a threshold of at least 2. The secret sharing apparatus generates a generator matrix (G) of GF(2) in which any k of n column vectors are at a full rank, divides secret information into n?1 pieces to generate divided secret data (K(1), . . . , K(n?1)), generates random data (U(0,1), . . . , U(k?2,n?1)), calculates the product of matrixes of the divided secret data, the random data, and the generator matrix (G), assigns the j×(n?1)+ith column of the calculation result to sharing partial data (D(j,i)) to calculate sharing partial data (D(j,1)), generates header information (H(j)), and individually distributes n pieces of sharing information (D(0), . . . , D(n?1)) made up of the header information (H(j)) and sharing partial data (D(j,i)) to n storage apparatuses.Type: GrantFiled: March 19, 2008Date of Patent: December 13, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventors: Norikazu Hosaka, Yoshihiro Fujii, Minako Tada, Takehisa Kato
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Patent number: 8074068Abstract: A secret sharing device of (k, n) threshold scheme creates a generator matrix G, first divided secret data, and random number data, calculates shared partial data based on the product of matrices with the random number data, the divided secret data, and the generator matrix G, and delivers the shared information formed by the shared partial data and the header information individually to the storage units. The secret sharing device calculates a recovery matrix and multiplies the shared information by the recovery matrix, hence to recover the secret information.Type: GrantFiled: May 2, 2008Date of Patent: December 6, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventors: Yoshihiro Fujii, Norikazu Hosaka, Minako Tada, Takehisa Kato
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Patent number: 7995763Abstract: A user apparatus cannot acquire as many distribution keys Ki, . . . as a threshold value, to restore a content encryption key KM, unless it decrypts as many encrypted sub-content items as the threshold value after it has played back a sub-content item SC1. The user apparatus monitors the state in which the sub-content is being played back. It outputs a warning when the sub-content is in fast-forwarding state or skipping state. If the playback state is not returned to one before the fast forwarding or skipping, in spite of the warning, the user apparatus will erase the distribution keys acquired in the fast-forwarding state or skipping state.Type: GrantFiled: June 30, 2008Date of Patent: August 9, 2011Assignees: Kabushiki Kaisha Toshiba, Toshiba Solutions CorporationInventor: Takehisa Kato
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Publication number: 20100269903Abstract: Provided are: a safe, low-cost method of producing a polycrystalline silicon substrate excellent in photoelectric conversion efficiency by which a uniform, fine uneven structure suited to a solar cell can be simply formed on the surface of the polycrystalline silicon substrate; and a polycrystalline silicon substrate having a uniform, fine, pyramid-shaped uneven structure so that its reflectance can be significantly reduced. The uneven structure is formed on the surface of the polycrystalline silicon substrate by etching the polycrystalline silicon substrate with an alkaline etching solution containing at least one kind selected from the group consisting of a carboxylic acid having 1 or more and 12 or less carbon atoms and each having at least one carboxyl group in one molecule, and salts of the acids.Type: ApplicationFiled: November 28, 2008Publication date: October 28, 2010Applicants: MIMASU SEMICONDUCTOR INDUSTRY CO., LTD., WAKO PURE CHEMICAL INDUSTRIES, LTD.Inventors: Masato Tsuchiya, Ikuo Mashimo, Yoshimichi Kimura, Takehisa Kato, Masahiko Kakizawa
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Patent number: 7700532Abstract: The present invention relates to a liquid cleaner for a semiconductor substrate on which metal wiring may be provided, comprising each component of a chelating agent or a salt thereof shown by the following general formula (1), an alkaline compound and pure water, wherein pH is 8 to 13: (wherein, Y1 and Y2 are lower alkylene groups, n is an integer of 0 to 4, at least 4 of R1 to R4 and n R5s are alkyl groups having phosphonic acid group(s) and the rest are alkyl groups) and a cleaning method using the same. The present invention provides a liquid cleaner which can efficiently remove fine particles or impurities derived from various metals at semiconductor substrate surface, even when used after a process adopting an alkaline polishing agent or alkaline etching liquid, without generating problems of causing difficult-to-remove gelled particles at the substrate surface or easy generation of rough semiconductor substrate surface, and a cleaning method using the same.Type: GrantFiled: November 7, 2003Date of Patent: April 20, 2010Assignee: Wako Pure Chemical Industries, Ltd.Inventors: Ichiro Hayashida, Hironori Mizuta, Takehisa Kato
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Publication number: 20090227115Abstract: Disclosed are an etching solution for a substrate and a substrate-etching method, which can prevent the contamination of a substrate, particularly a semiconductor substrate, with metal impurities. The etching solution comprises a dicarboxylic acid represented by the general formula (1) or a salt thereof and 20% (W/W) or more of an alkali metal hydroxide. The substrate-etching method comprises the step of etching a substrate with said etching solution.Type: ApplicationFiled: May 22, 2007Publication date: September 10, 2009Applicant: WAKO PURE CHEMICAL INDUSTRIES, LTD.Inventors: Takehisa Kato, Masahiko Kakizawa, Ichiro Hayashida