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).

  • Patent number: 11080020
    Abstract: 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: Grant
    Filed: April 16, 2020
    Date of Patent: August 3, 2021
    Assignee: MEGACHIPS CORPORATION
    Inventors: Takahiko Sugahara, Masayuki Imagawa, Hiroki Mizukami, Pan Yang
  • Publication number: 20200341734
    Abstract: 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: Application
    Filed: April 16, 2020
    Publication date: October 29, 2020
    Applicant: MegaChips Corporation
    Inventors: Takahiko SUGAHARA, Masayuki IMAGAWA, Hiroki MIZUKAMI, Pan YANG
  • Patent number: 10530567
    Abstract: 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: Grant
    Filed: October 3, 2017
    Date of Patent: January 7, 2020
    Assignee: MEGACHIPS CORPORATION
    Inventors: Takahiko Sugahara, Hiromu Yutani, Hajime Yoshimura, Masayuki Imagawa
  • Patent number: 10509565
    Abstract: 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: Grant
    Filed: December 7, 2017
    Date of Patent: December 17, 2019
    Assignee: MEGACHIPS CORPORATION
    Inventors: Harunobu Kishida, Masayuki Imagawa
  • Publication number: 20180165012
    Abstract: 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: Application
    Filed: December 7, 2017
    Publication date: June 14, 2018
    Applicant: MegaChips Corporation
    Inventors: Harunobu KISHIDA, Masayuki IMAGAWA
  • Publication number: 20180097613
    Abstract: 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: Application
    Filed: October 3, 2017
    Publication date: April 5, 2018
    Applicant: MegaChips Corporation
    Inventors: Takahiko SUGAHARA, Hiromu YUTANI, Hajime YOSHIMURA, Masayuki IMAGAWA
  • Patent number: 9266455
    Abstract: 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: Grant
    Filed: February 20, 2013
    Date of Patent: February 23, 2016
    Assignees: TOYOTA BOSHOKU KABUSHIKI KAISHA, TOYOBO CO., LTD.
    Inventors: Hideki Uramichi, Fumiya Makiguchi, Masayuki Imagawa, Hirotaka Harada
  • Patent number: 8504897
    Abstract: 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: Grant
    Filed: May 14, 2008
    Date of Patent: August 6, 2013
    Assignee: MegaChips Corporation
    Inventors: Masayuki Imagawa, Tetsuo Furuichi
  • Publication number: 20090149518
    Abstract: 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: Application
    Filed: October 17, 2006
    Publication date: June 11, 2009
    Applicant: ONO PHARMACEUTICAL CO., LTD.
    Inventors: Mikio Nishii, Yosuke Funakoshi, Masayuki Imagawa, Shinichiro Abe, Tomohiro Kuwayama
  • Publication number: 20080320342
    Abstract: 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: Application
    Filed: May 14, 2008
    Publication date: December 25, 2008
    Applicant: MegaChips Corporation
    Inventors: Masayuki IMAGAWA, Tetsuo Furuichi
  • Publication number: 20070045177
    Abstract: 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: Application
    Filed: October 25, 2004
    Publication date: March 1, 2007
    Applicant: TOYO BOSEKI KABUSHIKI KAISHA
    Inventors: Shoji Tokuda, Masayuki Imagawa
  • Patent number: 6746760
    Abstract: 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: Grant
    Filed: August 10, 2001
    Date of Patent: June 8, 2004
    Assignee: Toyobo Co., LTD
    Inventors: Shinichi Minemura, Masayuki Imagawa
  • Publication number: 20030207635
    Abstract: 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: Application
    Filed: August 10, 2001
    Publication date: November 6, 2003
    Inventors: Shinichi Minemura, Masayuki Imagawa