Patents by Inventor Keisuke Tanaka

Keisuke Tanaka 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: 9971262
    Abstract: A magnetic toner containing a magnetic toner particle having a binder resin and a magnetic body, and inorganic fine particles, wherein when the inorganic fine particles are classified as first inorganic fine particles, second inorganic fine particles, and third inorganic fine particles in accordance with fixing strength thereof to the magnetic toner particle and in the sequence of the weakness of the fixing strength, the content of the first inorganic fine particles, the ratio of the second inorganic fine particles to the first inorganic fine particles, and the coverage ratio X of coverage of the magnetic toner surface by the third inorganic fine particles are in prescribed ranges.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: May 15, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yusuke Hasegawa, Tomohisa Sano, Shuichi Hiroko, Yoshitaka Suzumura, Keisuke Tanaka
  • Patent number: 9971264
    Abstract: The magnetic toner contains a magnetic toner particle having a binder resin and a magnetic body, and inorganic fine particles, wherein the average circularity of the magnetic toner is at least 0.955 and, when classifying the inorganic fine particles, in accordance with the fixing strength thereof to the magnetic toner particle and in the sequence of the weakness of the fixing strength, as first inorganic fine particles, second inorganic fine particles, and third inorganic fine particles, the content of the first inorganic fine particles, the ratio of the second inorganic fine particles to the first inorganic fine particles, and the coverage ratio X are in prescribed ranges.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: May 15, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Tomohisa Sano, Yusuke Hasegawa, Shuichi Hiroko, Yoshitaka Suzumura, Keisuke Tanaka
  • Patent number: 9928853
    Abstract: According to one embodiment, a system for processing data includes a controller configured to determine whether a position error signal (PES) is invalid while reading data from a magnetic medium using at least one data channel. The controller is also configured to determine whether a PES value is above a first predetermined threshold in response to a determination that the PES is valid. Moreover, the controller is configured to inject error bits into a data stream in place of corresponding bits of decoded data in response to a determination that the PES is invalid and in response to a determination that the PES value is above the first predetermined threshold. Other systems and methods for processing data are described in accordance with more embodiments.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: March 27, 2018
    Assignee: International Business Machines Corporation
    Inventors: Nhan X. Bui, Setsuko Masuda, Keisuke Tanaka, Kazuhiro Tsuruta
  • Publication number: 20180082705
    Abstract: According to one embodiment, a system includes a controller configured to determine whether a position error signal (PES) is invalid while reading data from a magnetic medium using at least one data channel. An invalid PES indicates off-track reading or a defect in the magnetic medium. The controller is also configured to determine whether a PES value is above a first predetermined threshold in response to a determination that the PES is valid. Moreover, the controller is configured to inject error bits into a data stream in place of corresponding bits of decoded data in response to a determination that the PES is invalid, a determination that the PES value is above the first predetermined threshold, or a determination that the PES is invalid and the PES value is above the first predetermined threshold. Other systems and methods are described in accordance with more embodiments.
    Type: Application
    Filed: November 28, 2017
    Publication date: March 22, 2018
    Inventors: Nhan X. Bui, Setsuko Masuda, Keisuke Tanaka, Kazuhiro Tsuruta
  • Patent number: 9904195
    Abstract: A toner comprising: a toner particle containing a binder resin and a colorant, and an inorganic fine particle A and B present on the surface of the toner particle, wherein the inorganic fine particle A is a silica fine particle having a number-average particle diameter (D1) of primary particles in a specific range, the inorganic fine particle B has a number-average particle diameter (D1) of primary particles in a specific range, and is at least one fine particle selected from a group consisting of a silica fine particle, a titanium oxide fine particle, and an alumina fine particle, A total fixing ratio of the inorganic fine particle A and B is 75% or more, and an inter-particle force Fp(A) and an inter-particle force Fp(B) are within specific numerical ranges and satisfy a specific relationship.
    Type: Grant
    Filed: January 26, 2017
    Date of Patent: February 27, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takashi Matsui, Naoki Okamoto, Satoshi Arimura, Keisuke Tanaka, Shohei Tsuda
  • Publication number: 20180053527
    Abstract: In one embodiment, an apparatus includes a controller and logic integrated with and/or executable by the controller. The logic is configured to perform track-dependent erasure decoding on encoded data based on detection of one or more time-varying signal quality issues associated with at least one of a plurality of tracks read simultaneously from a data storage medium. In another embodiment, a method includes determining, by a magnetic tape drive, track signal quality reliability for a plurality of tracks read simultaneously from a magnetic tape medium. In addition, the method includes performing, by the magnetic tape drive, track-dependent erasure decoding on encoded data based on detection of one or more time-varying signal quality issues associated with at least one of the plurality of simultaneously-read tracks.
    Type: Application
    Filed: October 16, 2017
    Publication date: February 22, 2018
    Inventors: Steven R. Bentley, Roy D. Cideciyan, Simeon Furrer, Keisuke Tanaka
  • Publication number: 20180004109
    Abstract: A toner having a toner particle containing a binder resin, an amorphous polyester, and a colorant, wherein a softening point of the toner is at least 110° C. and not more than 140° C.; an integrated value f1 for stress of the toner is not more than 10 g·m/sec, as measured using a tack tester, with a temperature for a probe end being 150° C. and a press holding time being 0.01 seconds; and an integrated value f2 for stress of the toner is at least 30 g·m/sec, as measured using a tack tester, with a temperature for a probe end being 150° C. and a press holding time being 0.1 seconds.
    Type: Application
    Filed: June 23, 2017
    Publication date: January 4, 2018
    Inventors: Takashi Matsui, Naoki Okamoto, Yuujirou Nagashima, Keisuke Tanaka, Shohei Tsuda, Kosuke Fukudome, Takuya Mizuguchi
  • Publication number: 20180004106
    Abstract: A toner comprising a toner particle containing a binder resin, a colorant, an amorphous polyester, and a crystalline polyester, wherein the binder resin contains a vinyl resin; the amorphous polyester has a monomer unit derived from a linear aliphatic dicarboxylic acid having 6 to 12 carbons, and a monomer unit derived from a dialcohol; the content of the monomer unit derived from a linear aliphatic dicarboxylic acid having 6 to 12 carbons is 10 to 50 mol % with reference to the total monomer units derived from a carboxylic acid in the amorphous polyester; and in a cross section of the toner particle, the vinyl resin constitutes a matrix and the amorphous polyester constitutes domains, and the crystalline polyester is present in the interior of the domains.
    Type: Application
    Filed: June 23, 2017
    Publication date: January 4, 2018
    Inventors: Takashi Matsui, Yuujirou Nagashima, Keisuke Tanaka, Shohei Tsuda, Naoki Okamoto
  • Publication number: 20180004108
    Abstract: Provided is a toner comprising a toner particle including a binder resin, an amorphous polyester, and a colorant, wherein the binder resin includes a vinyl resin, the toner has a softening point of at least 110° C. and not more than 140° C., an amount of the amorphous polyester is at least 4.0 parts by mass and not more than 30.0 parts by mass with respect to 100 parts by mass of the binder resin, and a temperature T at which an area increasing rate of one toner particle sample becomes 1.40, is not more than 110° C., and a slope of the area increasing rate with respect to a temperature in the range of the area increasing rate of 1.40 to 2.00 is not more than 0.07.
    Type: Application
    Filed: June 22, 2017
    Publication date: January 4, 2018
    Inventors: Shohei Tsuda, Naoki Okamoto, Takashi Matsui, Yuujirou Nagashima, Keisuke Tanaka
  • Patent number: 9857707
    Abstract: Provided is a toner, including: a toner particle containing a binder resin and a colorant; and an inorganic fine particle, in which the toner particle has an average circularity of 0.960 or more, and in which the toner satisfies the formula (1) and the formula (2). Fp(A)?25.0 nN??Formula (1) (Fp(B)?Fp(A))/Fp(A)?0.
    Type: Grant
    Filed: October 26, 2015
    Date of Patent: January 2, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shohei Tsuda, Takashi Matsui, Satoshi Arimura, Kozue Uratani, Keisuke Tanaka, Naoki Okamoto
  • Patent number: 9837117
    Abstract: In one embodiment, a method includes reading, using a plurality of read sensors of a magnetic head in a read channel of a tape drive, encoded data from a plurality of tracks of a magnetic tape medium simultaneously. Also, the method includes monitoring statistics for the read channel, the statistics monitored for the read channel including exponentially averaged mean squared error (MSE) or signal-to-noise ratio (SNR) for each simultaneously read track. Moreover, the method includes performing track-dependent erasure decoding on the encoded data based on detection of one or more time-varying signal quality issues associated with at least one of the plurality of tracks read simultaneously from the magnetic tape medium. The one or more time-varying signal quality issues are determined based on side information about reliability of detected bytes within C1 codewords of each simultaneously-read track.
    Type: Grant
    Filed: June 10, 2016
    Date of Patent: December 5, 2017
    Assignee: International Business Machines Corporation
    Inventors: Steven R. Bentley, Roy D. Cideciyan, Simeon Furrer, Keisuke Tanaka
  • Publication number: 20170219945
    Abstract: A toner comprising: a toner particle containing a binder resin and a colorant, and an inorganic fine particle A and B present on the surface of the toner particle, wherein the inorganic fine particle A is a silica fine particle having a number-average particle diameter (D1) of primary particles in a specific range, the inorganic fine particle B has a number-average particle diameter (D1) of primary particles in a specific range, and is at least one fine particle selected from a group consisting of a silica fine particle, a titanium oxide fine particle, and an alumina fine particle, A total fixing ratio of the inorganic fine particle A and B is 75% or more, and an inter-particle force Fp(A) and an inter-particle force Fp(B) are within specific numerical ranges and satisfy a specific relationship.
    Type: Application
    Filed: January 26, 2017
    Publication date: August 3, 2017
    Inventors: Takashi Matsui, Naoki Okamoto, Satoshi Arimura, Keisuke Tanaka, Shohei Tsuda
  • Publication number: 20170218352
    Abstract: Recombinant collagenases with a stable specific activity and enzyme agents for cell and tissue dissociation such a recombinant are provided. The recombinant collagenase is derived from Grimontia hollisae-derived collagenase is characterized by having, from the N terminus to the C terminus, a collagenase catalytic domain, a linker region sequence, and a prepeptidase C terminal domain, which Grimontia hollisae-derived recombinant collagenase does not comprise at least the prepeptidase C terminal domain. The obtained recombinant collagenase has a high and stable specific activity.
    Type: Application
    Filed: March 6, 2015
    Publication date: August 3, 2017
    Inventors: Naoko Teramura, Katsumasa Iijima, Osamu Hayashida, Keisuke Tanaka, Shunji Hattori, Teru Okitsu, Shoji Takeuchi
  • Publication number: 20170194029
    Abstract: Various embodiments for data error recovery in a tape storage system, by a processor device, are provided. In one embodiment, a method comprises, in a tape storage system using an iterative hardware and microcode decoder, initializing at least one iterative decode cycle on the buffered dataset when an uncorrectable read error occurs; and for a next iterative decode cycle, building upon data corrections obtained in a previous iterative decode cycle.
    Type: Application
    Filed: January 25, 2017
    Publication date: July 6, 2017
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Steven R. BENTLEY, Pamela R. NYLANDER-HILL, Keisuke TANAKA
  • Publication number: 20170170849
    Abstract: In one embodiment, a system includes a controller and logic integrated with and/or executable by the controller. The logic is configured to perform iterative decoding on encoded data to obtain decoded data. The logic is also configured to perform post-decoding error diagnostics on a first portion of the decoded data in response to not obtaining a valid product codeword in the first portion after the iterative decoding of the encoded data. Other systems, methods, and computer program products for producing post-decoding error signatures are presented in accordance with more embodiments.
    Type: Application
    Filed: June 13, 2016
    Publication date: June 15, 2017
    Inventors: Steven R. Bentley, Roy D. Cideciyan, Robert A. Hutchins, Keisuke Tanaka
  • Patent number: 9666225
    Abstract: In one embodiment, a system includes a data processing unit configured to read encoded data from a magnetic tape medium. The data processing unit is also configured to decode a plurality of codeword interleaves (CWIs) from the encoded data, each CWI being a row in a sub data set logically organized into a two-dimensional array. The array includes a predetermined number of rows and columns of predetermined lengths. The data processing unit is also configured to determine an address for a first-written CWI without successfully decoding a corresponding codeword interleave designation (CWID) from the encoded data, each CWID specifying an address for a corresponding CWI. Also, each CWID is calculated as a function of a logical track number and a CWI set number.
    Type: Grant
    Filed: October 26, 2015
    Date of Patent: May 30, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Roy D. Cideciyan, Simeon Furrer, Robert A. Hutchins, Mark A. Lantz, Keisuke Tanaka
  • Publication number: 20170148486
    Abstract: In one embodiment, a method includes reading, using a plurality of read sensors of a magnetic head in a read channel of a tape drive, encoded data from a plurality of tracks of a magnetic tape medium simultaneously. Also, the method includes monitoring statistics for the read channel, the statistics monitored for the read channel including exponentially averaged mean squared error (MSE) or signal-to-noise ratio (SNR) for each simultaneously read track. Moreover, the method includes performing track-dependent erasure decoding on the encoded data based on detection of one or more time-varying signal quality issues associated with at least one of the plurality of tracks read simultaneously from the magnetic tape medium. The one or more time-varying signal quality issues are determined based on side information about reliability of detected bytes within C1 codewords of each simultaneously-read track.
    Type: Application
    Filed: June 10, 2016
    Publication date: May 25, 2017
    Inventors: Steven R. Bentley, Roy D. Cideciyan, Simeon Furrer, Keisuke Tanaka
  • Patent number: D801742
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: November 7, 2017
    Assignee: ITOKI CORPORATION
    Inventors: Yasuhiro Nakamura, Keisuke Tanaka, Yoshihiro Matsuzawa, Minoru Hashimoto
  • Patent number: D804878
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: December 12, 2017
    Assignee: ITOKI CORPORATION
    Inventors: Yasuhiro Nakamura, Keisuke Tanaka, Yoshihiro Matsuzawa, Minoru Hashimoto
  • Patent number: D805338
    Type: Grant
    Filed: April 27, 2016
    Date of Patent: December 19, 2017
    Assignee: ITOKI CORPORATION
    Inventors: Yasuhiro Nakamura, Keisuke Tanaka, Yoshihiro Matsuzawa, Minoru Hashimoto