Patents by Inventor Masayuki Imagawa
Masayuki Imagawa 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: 11080020Abstract: A memory device includes a memory core that stores data, an access controlling unit that controls an access to the memory core, and a random number generating unit that generates a random number based on an unstable factor related to an access operation to the memory core performed by the access controlling unit.Type: GrantFiled: April 16, 2020Date of Patent: August 3, 2021Assignee: MEGACHIPS CORPORATIONInventors: Takahiko Sugahara, Masayuki Imagawa, Hiroki Mizukami, Pan Yang
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Publication number: 20200341734Abstract: A memory device includes a memory core that stores data, an access controlling unit that controls an access to the memory core, and a random number generating unit that generates a random number based on an unstable factor related to an access operation to the memory core performed by the access controlling unit.Type: ApplicationFiled: April 16, 2020Publication date: October 29, 2020Applicant: MegaChips CorporationInventors: Takahiko SUGAHARA, Masayuki IMAGAWA, Hiroki MIZUKAMI, Pan YANG
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Patent number: 10530567Abstract: A noise generation module generates power consumption noise to conceal the power consumption characteristics of a cryptographic module. The cryptographic module performs first non-linear transformation on received data, and the noise generation module performs second non-linear transformation on received data during the operational period of the first non-linear transformation.Type: GrantFiled: October 3, 2017Date of Patent: January 7, 2020Assignee: MEGACHIPS CORPORATIONInventors: Takahiko Sugahara, Hiromu Yutani, Hajime Yoshimura, Masayuki Imagawa
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Patent number: 10509565Abstract: Upon receiving an erase command and a first logical address, a controller in a first mode sets, as an erasure waiting area, an erasure unit area assigned with a first physical address associated with the first logical address in a first table. The controller in the first mode replaces, in the first table, the first physical address with a physical address assigned to an erasure completion area. The controller in a second mode sets the erasure waiting area as the erasure completion area. Upon receiving a release command to release the second mode at some point in time of data erasure from the erasure waiting area, the controller changes the operation mode to a third mode. The controller operating in the third mode erases un-erased data from the erasure waiting area and changes the operation mode from the third mode to the first mode.Type: GrantFiled: December 7, 2017Date of Patent: December 17, 2019Assignee: MEGACHIPS CORPORATIONInventors: Harunobu Kishida, Masayuki Imagawa
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Publication number: 20180165012Abstract: Upon receiving an erase command and a first logical address, a controller in a first mode sets, as an erasure waiting area, an erasure unit area assigned with a first physical address associated with the first logical address in a first table. The controller in the first mode replaces, in the first table, the first physical address with a physical address assigned to an erasure completion area. The controller in a second mode sets the erasure waiting area as the erasure completion area. Upon receiving a release command to release the second mode at some point in time of data erasure from the erasure waiting area, the controller changes the operation mode to a third mode. The controller operating in the third mode erases un-erased data from the erasure waiting area and changes the operation mode from the third mode to the first mode.Type: ApplicationFiled: December 7, 2017Publication date: June 14, 2018Applicant: MegaChips CorporationInventors: Harunobu KISHIDA, Masayuki IMAGAWA
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Publication number: 20180097613Abstract: A noise generation module generates power consumption noise to conceal the power consumption characteristics of a cryptographic module. The cryptographic module performs first non-linear transformation on received data, and the noise generation module performs second non-linear transformation on received data during the operational period of the first non-linear transformation.Type: ApplicationFiled: October 3, 2017Publication date: April 5, 2018Applicant: MegaChips CorporationInventors: Takahiko SUGAHARA, Hiromu YUTANI, Hajime YOSHIMURA, Masayuki IMAGAWA
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Patent number: 9266455Abstract: Embodiments of present invention may include a cushion pad for supporting a seated passenger; the cushion pad being divided into a left pad section, a middle pad section and a right pad section; a soft resin foam dispersed throughout the left pad section, the middle pad section and the right pad section; the left pad section having a left holding volume for holding a first volume of an elastic three-dimensional fibrous network and the soft resin foam; the right pad section having a right holding volume for holding a second volume of an elastic three-dimensional fibrous network and the soft resin foam; and the middle pad section not having a volume of an elastic three-dimensional fibrous network contained within.Type: GrantFiled: February 20, 2013Date of Patent: February 23, 2016Assignees: TOYOTA BOSHOKU KABUSHIKI KAISHA, TOYOBO CO., LTD.Inventors: Hideki Uramichi, Fumiya Makiguchi, Masayuki Imagawa, Hirotaka Harada
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Patent number: 8504897Abstract: A memory controller carries out error detection on a wide range of area of a memory cell array, which includes not only readout addresses but also non-readout addresses. Thus, by carrying out error detection at an address at which an error occurs without accessing the address for readout, it is possible to detect occurrence of an error at the address. Accordingly, it is possible to prevent a “read disturb phenomenon” in which repetition of access to a readout address for readout may probably cause an error at a non-readout address other than the readout address.Type: GrantFiled: May 14, 2008Date of Patent: August 6, 2013Assignee: MegaChips CorporationInventors: Masayuki Imagawa, Tetsuo Furuichi
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Publication number: 20090149518Abstract: The present invention relates to an agent for protecting a motor nerve of a patient with amyotrophic lateral sclerosis, which comprises a combination of (a) (2R)-2-propyloctanoic acid or a salt thereof and (b) a therapeutic agent for amyotrophic lateral sclerosis such as riluzole. An agent comprising a combination of (a) (2R)-2-propyloctanoic acid which is orally administered once a day in an amount per dose of about 1200 mg and (b) riluzole which is orally administered twice a day in an amount per dose of about 50 mg is useful for protecting a motor nerve in a patient(s) with amyotrophic lateral sclerosis. The agent can also suppress the respiratory disability associated with the progression of the disease condition and improve the survival rate of the patient(s).Type: ApplicationFiled: October 17, 2006Publication date: June 11, 2009Applicant: ONO PHARMACEUTICAL CO., LTD.Inventors: Mikio Nishii, Yosuke Funakoshi, Masayuki Imagawa, Shinichiro Abe, Tomohiro Kuwayama
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Publication number: 20080320342Abstract: A memory controller carries out error detection on a wide range of area of a memory cell array, which includes not only readout addresses but also non-readout addresses. Thus, by carrying out error detection at an address at which an error occurs without accessing the address for readout, it is possible to detect occurrence of an error at the address. Accordingly, it is possible to prevent a “read disturb phenomenon” in which repetition of access to a readout address for readout may probably cause an error at a non-readout address other than the readout address.Type: ApplicationFiled: May 14, 2008Publication date: December 25, 2008Applicant: MegaChips CorporationInventors: Masayuki IMAGAWA, Tetsuo Furuichi
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Publication number: 20070045177Abstract: The invention provides a charged filter material composed of a combination of polyester fiber and polyolefin fiber, which can exhibit high particle collection efficiency with low pressure loss, and further provides a charged filter material which is self-extinguishing in the combustibility classification according to JIS D 1201 (1977) “method of combustibility test for organic materials disposed in automobile compartment” and which does not generate dioxins at the time of incineration. Disclosed is a friction-charged filter material comprising at least 20 mass % of polyester fiber containing a phosphinic acid compound and/or sulfonic acid compound and at least 30 mass % of polyolefin fiber, as well as the above-described friction-charged filter material wherein the polyester fiber comprises a phosphinic acid compound and/or sulfonic acid compound copolymerized with a polyester molecular chain.Type: ApplicationFiled: October 25, 2004Publication date: March 1, 2007Applicant: TOYO BOSEKI KABUSHIKI KAISHAInventors: Shoji Tokuda, Masayuki Imagawa
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Patent number: 6746760Abstract: The gas adsorption sheet of the present invention has a granular activated carbon-containing sheet comprising a granular activated carbon having an average particle diameter of 60 to 600 &mgr;m, a supporting fiber for fixing the granular activated carbon in contact with it, and an adhesive fiber which mainly contributes to shape retention. An air-purifying filter of the present invention is obtained by forming the gas adsorption sheet into a shape of pleats or wave. A method for producing a gas adsorption sheet of the present invention comprises a step of forming a granular activated carbon-containing sheet by using an aqueous slurry containing a granular activated carbon, a supporting fiber and a water-swelling adhesive fiber.Type: GrantFiled: August 10, 2001Date of Patent: June 8, 2004Assignee: Toyobo Co., LTDInventors: Shinichi Minemura, Masayuki Imagawa
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Publication number: 20030207635Abstract: The gas adsorption sheet of the present invention has a granular activated carbon-containing sheet comprising a granular activated carbon having an average particle diameter of 60 to 600 &mgr;m, a supporting fiber for fixing the granular activated carbon in contact with it, and an adhesive fiber which mainly contributes to shape retention. An air-purifying filter of the present invention is obtained by forming the gas adsorption sheet into a shape of pleats or wave. A method for producing a gas adsorption sheet of the present invention comprises a step of forming a granular activated carbon-containing sheet by using an aqueous slurry containing a granular activated carbon, a supporting fiber and a water-swelling adhesive fiber.Type: ApplicationFiled: August 10, 2001Publication date: November 6, 2003Inventors: Shinichi Minemura, Masayuki Imagawa