Patents by Inventor Akio Hasegawa
Akio Hasegawa 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: 20240116031Abstract: An object of the present invention is to provide a catalyst that enables production of an unsaturated carboxylic acid and/or unsaturated carboxylic acid ester represented by methyl methacrylate with high selectivity. The object is achieved by a catalyst including: one or more elements selected from boron, magnesium, zirconium, hafnium, and titanium; one or more elements selected from alkali metal elements; and silica; the catalyst having a peak height ratio I2/I1 of 0 to 1.2, wherein I1 represents the peak height at 417±10 cm?1, and I2 represents the peak height at 1050±10 cm?1, as obtained by Raman spectroscopy.Type: ApplicationFiled: November 30, 2023Publication date: April 11, 2024Applicant: Mitsubishi Chemical CorporationInventors: Akio Hayashi, Yuuki Tsujimoto, Toshio Hasegawa, Kazufumi Nishida, Masaya Fujisue, Wataru Ninomiya
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Patent number: 11931099Abstract: A catheter flexible printed wiring board which includes: a long flexible insulating base member having a tip end portion and a base end portion; and a conductive pattern formed on the flexible insulating base member and extending from the base end portion to the tip end portion, wherein the conductive pattern at the base end portion is wider than the conductive pattern at the tip end portion and thicker than the conductive pattern at the tip end portion.Type: GrantFiled: January 14, 2019Date of Patent: March 19, 2024Assignee: NIPPON MEKTRON, LTD.Inventors: Akio Yoshida, Ryoichi Toyoshima, Mitsunori Sasaki, Hiroyasu Hasegawa
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Patent number: 10334628Abstract: A transmitter generates a header frame having a frame length indicating the beginning of data to be transmitted, data frames having frame lengths representing the data to be transmitted, and an end frame having a frame length indicating the end of the data to be transmitted. Then, for all of the header frame, data frames and end frame, the transmitter executes transmitting the kth frame when the wireless communication space is available, thereby transmitting the header frame, data frames and end frame, one after another, in accordance with the CSMA/CA scheme.Type: GrantFiled: May 2, 2018Date of Patent: June 25, 2019Assignees: NEC COMMUNICATION SYSTEMS, LTD., A SCHOOL CORPORATION KANSAI UNIVERSITY, ADVANCED TELECOMMUNICATIONS RESEARCH INSTITUTE INTERNATIONALInventors: Tetsuya Ito, Yukihiro Hara, Masahito Iwai, Hiroyuki Yomo, Takatoshi Kimura, Akio Hasegawa
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Patent number: 10194392Abstract: When a terminal device initiates a wireless communication when it has not established a wireless link between itself and another wireless device, it transmits, as a management frames in active scanning, a plurality of activation probe requests having frame lengths representing an identifier of a wireless base station to which connection is being made and which is intended to transition from sleep mode to operating mode. Then, the wireless base station receives the plurality of activation probe requests transmitted by the terminal device as management frames in active scanning in a wireless LAN, and, when a plurality of dummy network identifiers detected based on the received plurality of activation probe requests represent the identifier of its own, transitions from sleep mode to operating mode.Type: GrantFiled: August 21, 2015Date of Patent: January 29, 2019Assignees: ADVANCED TELECOMMUNICATIONS RESERACH INSTITUTE INTERNATIONAL, NEC COMMUNICATION SYSTEMS, LTD.Inventors: Masahito Iwai, Yukihiro Hara, Tetsuya Ito, Takatoshi Kimura, Akio Hasegawa
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Publication number: 20180270862Abstract: A transmitter generates a header frame having a frame length indicating the beginning of data to be transmitted, data frames having frame lengths representing the data to be transmitted, and an end frame having a frame length indicating the end of the data to be transmitted. Then, for all of the header frame, data frames and end frame, the transmitter executes transmitting the kth frame when the wireless communication space is available, thereby transmitting the header frame, data frames and end frame, one after another, in accordance with the CSMA/CA scheme.Type: ApplicationFiled: May 2, 2018Publication date: September 20, 2018Inventors: Tetsuya ITO, Yukihiro HARA, Masahito IWAI, Hiroyuki YOMO, Takatoshi KIMURA, Akio HASEGAWA
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Patent number: 9999075Abstract: A transmitter generates a header frame having a frame length indicating the beginning of data to be transmitted, data frames having frame lengths representing the data to be transmitted, and an end frame having a frame length indicating the end of the data to be transmitted. Then, for all of the header frame, data frames and end frame, the transmitter executes transmitting the kth frame when the wireless communication space is available, thereby transmitting the header frame, data frames and end frame, one after another, in accordance with the CSMA/CA scheme.Type: GrantFiled: September 15, 2015Date of Patent: June 12, 2018Assignees: NEC COMMUNICATION SYSTEMS, LTD., A SCHOOL CORPORATION KANSAI UNIVERSITY, ADVANCED TELECOMMUNICATIONS RESEARCH INSTITUTE INTInventors: Tetsuya Ito, Yukihiro Hara, Masahito Iwai, Hiroyuki Yomo, Takatoshi Kimura, Akio Hasegawa
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Patent number: 9989939Abstract: A wireless device (1) searches a database that stores positional information of the wireless device (1), a device (2-4) and control identifiers for controlling the devices (2-4) in an associated manner, acquires a device (2-4) located near the wireless device (1) and a control identifier for controlling the device (2-4) based on the positional information of the wireless device (1), and, based on the device (2-4) and the control identifier for controlling the device (2-4) that have been acquired, determines a controlled device (at least one of the devices (2-4)) and generates a control identifier for the controlled device. The wireless device (1) transmits, by wireless communication, the generated controlled identifier to a receiver mounted on the controlled device to control the controlled device.Type: GrantFiled: March 26, 2013Date of Patent: June 5, 2018Assignees: NEC COMMUNICATION SYSTEMS, LTD., A SCHOOL CORPORATION KANSAI UNIVERSITY, ADVANCED TELECOMMUNICATIONS RESEARCH INSTITUTE INTInventors: Tetsuya Ito, Yukihiro Hara, Masahito Iwai, Yuma Asada, Yuta Okamoto, Shota Kakibuti, Ryou Nagase, Shohei Fukayama, Hironori Fukui, Noboru Miyamoto, Hiroyuki Yomo, Takatoshi Kimura, Suhua Tang, Akio Hasegawa
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Publication number: 20160044596Abstract: When a terminal device initiates a wireless communication when it has not established a wireless link between itself and another wireless device, it transmits, as a management frames in active scanning, a plurality of activation probe requests having frame lengths representing an identifier of a wireless base station to which connection is being made and which is intended to transition from sleep mode to operating mode. Then, the wireless base station receives the plurality of activation probe requests transmitted by the terminal device as management frames in active scanning in a wireless LAN, and, when a plurality of dummy network identifiers detected based on the received plurality of activation probe requests represent the identifier of its own, transitions from sleep mode to operating mode.Type: ApplicationFiled: August 21, 2015Publication date: February 11, 2016Inventors: Masahito IWAI, Yukihiro HARA, Tetsuya ITO, Takatoshi KIMURA, Akio HASEGAWA
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Publication number: 20160007380Abstract: A transmitter generates a header frame having a frame length indicating the beginning of data to be transmitted, data frames having frame lengths representing the data to be transmitted, and an end frame having a frame length indicating the end of the data to be transmitted. Then, for all of the header frame, data frames and end frame, the transmitter executes transmitting the kth frame when the wireless communication space is available, thereby transmitting the header frame, data frames and end frame, one after another, in accordance with the CSMA/CA scheme.Type: ApplicationFiled: September 15, 2015Publication date: January 7, 2016Inventors: Tetsuya ITO, Yukihiro HARA, Masahito IWAI, Hiroyuki YOMO, Takatoshi KIMURA, Akio HASEGAWA
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Publication number: 20150148921Abstract: A wireless device (1) searches a database that stores positional information of the wireless device (1), a device (2-4) and control identifiers for controlling the devices (2-4) in an associated manner, acquires a device (2-4) located near the wireless device (1) and a control identifier for controlling the device (2-4) based on the positional information of the wireless device (1), and, based on the device (2-4) and the control identifier for controlling the device (2-4) that have been acquired, determines a controlled device (at least one of the devices (2-4)) and generates a control identifier for the controlled device. The wireless device (1) transmits, by wireless communication, the generated controlled identifier to a receiver mounted on the controlled device to control the controlled device.Type: ApplicationFiled: March 26, 2013Publication date: May 28, 2015Inventors: Tetsuya Ito, Yukihiro Hara, Masahito Iwai, Yuma Asada, Yuta Okamoto, Shota Kakibuti, Ryou Nagase, Shohei Fukayama, Hironori Fukui, Noboru Miyamoto, Hiroyuki Yomo, Takatoshi Kimura, Suhua Tang, Akio Hasegawa
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Patent number: 8238319Abstract: Radio apparatuses each has a plurality of channels and, when data is to be transmitted, selects a specific channel having relatively low signal interference from the plurality of channels. Each radio apparatus spreads transmission data with a prescribed spread code arbitrarily selected from a plurality of spread codes, and modulates the spread spectrum signal with the frequency of the specific channel to transmit. As a result, delay in an autonomously established wireless network can be reduced.Type: GrantFiled: August 30, 2007Date of Patent: August 7, 2012Assignee: Advanced Telecommunications Research Institute InternationalInventors: Naoto Kadowaki, Peter Davis, Jun Hasegawa, Akio Hasegawa, Sadao Obana
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Patent number: 8121629Abstract: Radio devices (31 to 43) receive a prescribed number of Hello packets from each of n radio devices existing within one hop from each radio device, detects six pairs of maximum and minimum values MAX[1] and MIN[1] to MAX[6] and MIN[6] based on the plurality of reception signal strengths of the plurality of received Hello packets, detects two adjacent maximum values having the largest difference among six pairs of maximum and minimum values D_MAX[1] and D_MIN[1] to D_MAX[6] and D_MIN[6] when the six maximum values MAX[1] to MAX[6] are in descending order, and determines the average of two minimum values corresponding to the detected two maximum values as a threshold. The radio devices (31 to 43) each produce a routing table including routes having reception signal strengths equal to or more than the threshold.Type: GrantFiled: March 29, 2006Date of Patent: February 21, 2012Assignee: Advanced Telecommunications Research Institute InternationalInventors: Peter Davis, Satoko Itaya, Jun Hasegawa, Akio Hasegawa, Naoto Kadowaki, Sadao Obana
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Patent number: 8041377Abstract: A radio device is located far from other radio devices in a radio network system. The radio device determines a threshold WIth for detecting a strength equal to or more than the minimum strength of radio waves transmitted/received in a stable radio wave environment based on a plurality of reception signal strengths of Hello packets received from radio devices adjacent to the radio device. Then, if the number of radio devices adjacent to the radio device when the threshold WIth is introduced is less than a standard value (such as five), the radio device stores the adjacent radio devices in the neighbor list without introducing the threshold WIth, and then, maintains in the routing table the routing information of routes passing through the adjacent radio devices based on the neighbor list.Type: GrantFiled: September 27, 2007Date of Patent: October 18, 2011Assignees: NEC Communication Systems Ltd., Advanced Telecommunications Research Institute InternationalInventors: Satoko Itaya, Jun Hasegawa, Akio Hasegawa, Peter Davis, Tetsuya Ito, Akira Matsumoto, Naoto Kadowaki, Sadao Obana
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Patent number: 7925014Abstract: Random number generating, encrypting, and decrypting apparatus, method thereof, program thereof, and recording medium thereof are provided. Random numbers for cryptographic applications are generated by a CA core. The CA core is composed of one-dimensional, two-state, and three-neighbor cell automaton. A total of three inputs for the own cell and both neighbor cells are input to each cell. Each cell performs a logical operation and outputs the result of the logical operation. Each cell contains a register. Each register captures the result of the logical operation in synchronization with a clock and stores the result. An output of a cell is fed back to the cell to perform an arithmetic calculation at the next time step. In this case, a rotation shift operation of which outputs of cells are shifted to the left and fed back to the cells is performed. To output random numbers having many bits, 40 bits of outputs of cells are selected.Type: GrantFiled: March 25, 2003Date of Patent: April 12, 2011Assignee: National Institute of Information and Communications Technology, Incorporated Administrative AgencyInventors: Song-Ju Kim, Akio Hasegawa, Ken Umeno
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Patent number: 7890112Abstract: The route maintenance unit outputs a period setting request to the period setting unit when the communication unit normally receives a Hello packet for the first time. The period setting unit sets a link connection confirmation period in response to the period setting request and outputs the set period to the route maintenance unit. The route maintenance unit maintains a radio link between the radio device in which the route maintenance unit is provided and an adjacent device upon receiving a data packet other than a Hello packet from the adjacent radio device even if a Hello packet is not received in the link connection confirmation period. Consequently, route disconnection or switching occurs less often.Type: GrantFiled: September 4, 2007Date of Patent: February 15, 2011Assignees: NEC Communication Systems, Ltd., Advanced Telecommunications Research Institute InternationalInventors: Tetsuya Ito, Jun Hasegawa, Satoko Itaya, Akira Matsumoto, Hiroyuki Iizuka, Yuichiro Ezure, Akio Hasegawa, Peter Davis, Naoto Kadowaki, Sadao Obana
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Patent number: 7697590Abstract: A chaos spreading code c(n) is inputted to a spreading unit 32. Data D1 and c(n) are multiplied in the spreading unit 32. A chaos spreading code d(n) is inputted to a spreading unit 42. Data D2 and d(n) are multiplied in the spreading unit 42. The chaos spreading codes c(n) and d(n) orthogonally cross each other. Outputs of the spreading units 32 and 42 are added by an adder 35 and transmitted through a transmitting unit 36 to a transmission path 38. By making an initial value which is set in a chaos sequence generator having a construction of a digital circuit different, the chaos spreading codes which orthogonally cross can be formed. Since the chaos spreading codes c(n) and d(n) orthogonally cross, an orthogonal modulating unit having a construction of an analog circuit for amplitude-modulating carriers which orthogonally cross can be made unnecessary and the construction can be simplified.Type: GrantFiled: June 11, 2004Date of Patent: April 13, 2010Assignees: Japan Science and Technology Agency, National Institute of Information and Communications Technology, Incorporated Administrative AgencyInventors: Ken Umeno, Akio Hasegawa, Minghui Kao
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Publication number: 20080125069Abstract: Radio devices (31 to 43) receive a prescribed number of Hello packets from each of n radio devices existing within one hop from each radio device, detects six pairs of maximum and minimum values MAX[1] and MIN[1] to MAX[6] and MIN[6] based on the plurality of reception signal strengths of the plurality of received Hello packets, detects two adjacent maximum values having the largest difference among six pairs of maximum and minimum values D_MAX[1] and D_MIN[1] to D_MAX[6] and D_MIN[6] when the six maximum values MAX[1] to MAX[6] are in descending order, and determines the average of two minimum values corresponding to the detected two maximum values as a threshold. The radio devices (31 to 43) each produce a routing table including routes having reception signal strengths equal to or more than the threshold.Type: ApplicationFiled: March 29, 2006Publication date: May 29, 2008Inventors: Peter Davis, Satoko Itaya, Jun Hasegawa, Akio Hasegawa, Naoto Kadowaki, Sadao Obana
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Publication number: 20080076461Abstract: A radio device is located far from other radio devices in a radio network system. The radio device determines a threshold WIth for detecting a strength equal to or more than the minimum strength of radio waves transmitted/received in a stable radio wave environment based on a plurality of reception signal strengths of Hello packets received from radio devices adjacent to the radio device. Then, if the number of radio devices adjacent to the radio device when the threshold WIth is introduced is less than a standard value (such as five), the radio device stores the adjacent radio devices in the neighbor list without introducing the threshold WIth, and then, maintains in the routing table the routing information of routes passing through the adjacent radio devices based on the neighbor list.Type: ApplicationFiled: September 27, 2007Publication date: March 27, 2008Inventors: Satoko Itaya, Jun Hasegawa, Akio Hasegawa, Peter Davis, Tetsuya Ito, Akira Matsumoto, Naoto Kadowaki, Sadao Obana
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Publication number: 20080062901Abstract: Radio apparatuses each has a plurality of channels and, when data is to be transmitted, selects a specific channel having relatively low signal interference from the plurality of channels. Each radio apparatus spreads transmission data with a prescribed spread code arbitrarily selected from a plurality of spread codes, and modulates the spread spectrum signal with the frequency of the specific channel to transmit. As a result, delay in an autonomously established wireless network can be reduced.Type: ApplicationFiled: August 30, 2007Publication date: March 13, 2008Inventors: Naoto Kadowaki, Peter Davis, Jun Hasegawa, Akio Hasegawa, Sadao Obana
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Publication number: 20080056196Abstract: The route maintenance unit outputs a period setting request to the period setting unit when the communication unit normally receives a Hello packet for the first time. The period setting unit sets a link connection confirmation period in response to the period setting request and outputs the set period to the route maintenance unit. The route maintenance unit maintains a radio link between the radio device in which the route maintenance unit is provided and an adjacent device upon receiving a data packet other than a Hello packet from the adjacent radio device even if a Hello packet is not received in the link connection confirmation period. Consequently, route disconnection or switching occurs less often.Type: ApplicationFiled: September 4, 2007Publication date: March 6, 2008Inventors: Tetsuya Ito, Jun Hasegawa, Satoko Itaya, Akira Matsumoto, Hiroyuki Iizuka, Yuichiro Ezure, Akio Hasegawa, Peter Davis, Naoto Kadowaki, Sadao Obana