Patents by Inventor Kenta Takahashi
Kenta Takahashi 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: 20180241558Abstract: A biometric authentication system has a terminal which extracts and encodes feature data for authentication from acquired biometric information, and which transmits the encoded feature data for authentication. The system has a DB for storing encrypted authentication information, a search unit which searches for encrypted authentication information included in the DB, and a decryption unit which decrypts the encrypted authentication information searched for using encoded feature data for authentication as a decryption key. Accordingly, a user is uniquely identified using the obtained authentication information. Further, a processing unit performs authentication response processing with respect to the identified user, based on authentication information obtained by decryption.Type: ApplicationFiled: March 21, 2017Publication date: August 23, 2018Inventor: Kenta TAKAHASHI
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Patent number: 10057068Abstract: A biometric signature system generates a digital signature for electronic documents using biometric information as a secret key. Registration commitment information is generated by performing expansion conversion on a predetermined secret key and embedding the resulting secret key in feature data of biometric information of a user, and a set with a corresponding public key. A pair of one-time secret and public keys is generated for digital signature feature data of the biometric information of the user, and a digital signature for a message is generated using the one-time secret key. A digital signature commitment is generated and a set of the one-time public key and the digital signature is output as the biometric digital signature. The digital signature is verified using the one-time public key. A differential secret key is calculated and a correspondence of the differential secret key, the one-time public key and the public key is verified.Type: GrantFiled: May 28, 2013Date of Patent: August 21, 2018Assignee: HITACHI, LTD.Inventor: Kenta Takahashi
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Publication number: 20170239156Abstract: Provided is a composition for controlling hair shape, which affords a superior feeling of hair touch (softness, smoothness, gathering property, gloss etc.), an effect of suppressing damage to the hair, forming a desired wave shape and the like, and sustaining the shape of the hair. A hair shape control assisting agent containing component (A): a compound represented by the formula (1) wherein each symbol is described in the SPECIFICATION, or a salt thereof.Type: ApplicationFiled: February 23, 2017Publication date: August 24, 2017Applicant: AJINOMOTO CO., INCInventors: Shun KOBAYASHI, Kenta TAKAHASHI
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Publication number: 20170222809Abstract: A sequential biometric cryptosystem includes: a registration terminal that extracts a set of feature data from each of multiple pieces of biological information acquired from each user, sequentially selects, out of these, a group of multiple sets of feature data, incrementing the number of combined sets, creates a protection template for each selected group of feature data, and stores the protection template into a storage apparatus. The sequential biometric cryptosystem also includes an authentication terminal that extracts feature data from a combination including one or more pieces of biological information of a specified user, acquired through a sensor on the user, verifies a combination of the extracted feature data against the protection template derived from the biological information having the same specified attribute, and performs, if the verification is successful, specified processing on the user.Type: ApplicationFiled: May 25, 2015Publication date: August 3, 2017Applicant: HITACHI, LTD.Inventor: Kenta TAKAHASHI
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Patent number: 9694584Abstract: A liquid ejector includes a head having a plurality of nozzles arranged along a first direction of a nozzle surface of the head to eject a droplet from the nozzles, and an ejection detector to detect whether or not a droplet is ejected from the plurality of nozzles of the head by detecting an electrical change generated when the droplet lands onto the ejection detector. The ejection detector includes a droplet landing surface arranged opposed to the nozzle surface, a wiper to wipe the droplet off the droplet landing surface along the first direction, and a cleaner having a contact surface to remove the droplet adhered to the wiper after the wiper wipes the droplet landing surface. The contact surface has a curvature such that side ends of the wiper contacts with the contact surface at first, and then a center part of the wiper contacts the contact surface.Type: GrantFiled: July 22, 2016Date of Patent: July 4, 2017Assignee: RICOH COMPANY, LTD.Inventors: Shingo Masaoka, Shotaro Takeuchi, Masahiko Hisada, Kenta Takahashi
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Publication number: 20170124338Abstract: As a technology for preventing the leaking of confidential information more properly, provided is a work recording apparatus including: a recording control unit configured to record a work situation; a position detection unit configured to detect a position; and a usable function restriction unit configured to specify an applicable predetermined state through use of the position detected by the position detection unit and restrict a part or all of functions of the recording control unit based on the specified applicable predetermined state.Type: ApplicationFiled: June 13, 2014Publication date: May 4, 2017Inventors: Kentarou OONISHI, Daisuke KATSUMATA, Tooru SUGIMOTO, Naoto MURAYAMA, Nobuhiro IHORI, Naoto MIYAO, Shinya IGUCHI, Kenta TAKAHASHI, Takayuki FUJIWARA, Hiroaki TAKATSUKI
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Patent number: 9565023Abstract: A signature generation and verification system including a signature generation apparatus and a signature verification apparatus is provided. Based on signer certification information possessed by a signer, the signature generation apparatus generates a digital signature and verification data corresponding to a given electronic document and outputs the set of the digital signature and the verification data as signature data. Upon receipt of the electronic document and the signature data, the signature verification apparatus verifies the digital signature using the verification data to verify the integrity of the electronic document. As needed, the signature verification apparatus performs user identification ex-post facto by authenticating that the signer certification information from which the verification data was generated belongs to a legitimate user without knowledge of the signer certification information.Type: GrantFiled: July 10, 2013Date of Patent: February 7, 2017Assignee: Hitachi, Ltd.Inventors: Kenta Takahashi, Masakatsu Nishigaki, Yuta Yoneyama, Eisei Honbu
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Patent number: 9555331Abstract: An obtaining unit of a moving control device obtains a first contact position and a second contact position on a touch panel. A determination unit determines information about a trajectory of a moving object in a virtual space based on the first contact position and second contact position. A moving control unit moves the moving object in the virtual space based on the information.Type: GrantFiled: August 25, 2014Date of Patent: January 31, 2017Assignee: KONAMI DIGITAL ENTERTAINMENT CO., LTD.Inventors: Kuka Lee, Kenta Takahashi, Kentaro Nagayama
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Publication number: 20160325550Abstract: A liquid ejector includes a head having a plurality of nozzles arranged along a first direction of a nozzle surface of the head to eject a droplet from the nozzles, and an ejection detector to detect whether or not a droplet is ejected from the plurality of nozzles of the head by detecting an electrical change generated when the droplet lands onto the ejection detector. The ejection detector includes a droplet landing surface arranged opposed to the nozzle surface, a wiper to wipe the droplet off the droplet landing surface along the first direction, and a cleaner having a contact surface to remove the droplet adhered to the wiper after the wiper wipes the droplet landing surface. The contact surface has a curvature such that side ends of the wiper contacts with the contact surface at first, and then a center part of the wiper contacts the contact surface.Type: ApplicationFiled: July 22, 2016Publication date: November 10, 2016Applicant: Ricoh Company, Ltd.Inventors: Shingo Masaoka, Shotaro Takeuchi, Masahiko Hisada, Kenta Takahashi
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Patent number: 9341598Abstract: An ultrasonic testing apparatus includes an array probe 3 disposed to face a flange-side rim face 16 of a wheel 1. The ultrasonic testing apparatus also includes an array flaw detector having a function of transmitting transmission-reception control signals to the array probe, and a personal computer having a function of setting various parameters for the array flaw detector, and receiving signals from the array flaw detector so as to generate images such as an A-scope image and a B-scope image. When detecting a flaw, the array probe is disposed in such a manner that a transducer face thereof faces the flange-side rim face. At this time, an angle between the transducer alignment direction of the array probe and the radial direction of the wheel 1 is set to be 20 to 60° when viewed in the axial direction, and the flaw detection is carried out at this angle.Type: GrantFiled: June 5, 2012Date of Patent: May 17, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hitoshi Murakoshi, Kenta Takahashi
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Publication number: 20160094348Abstract: A biometric signature system generates a digital signature for electronic documents using biometric information as a secret key. Registration commitment information is generated by performing expansion conversion on a predetermined secret key and embedding the resulting secret key in feature data of biometric information of a user, and a set with a corresponding public key. A pair of one-time secret and public keys is generated for digital signature feature data of the biometric information of the user, and a digital signature for a message is generated using the one-time secret key. A digital signature commitment is generated and a set of the one-time public key and the digital signature is output as the biometric digital signature. The digital signature is verified using the one-time public key. A differential secret key is calculated and a correspondence of the differential secret key, the one-time public key and the public key is verified.Type: ApplicationFiled: May 28, 2013Publication date: March 31, 2016Applicant: HITACHI, LTD.Inventor: Kenta TAKAHASHI
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Publication number: 20160018426Abstract: To efficiently prevent a decrease in measurement accuracy caused by a change in a test cartridge and an environmental temperature, provided is an automatic analysis device. The automatic analysis device includes: a constant-temperature reservoir (6) to be heated by a heating source (6a) so as to keep a liquid temperature at least in the reaction cell (11c) of the test cartridge (10) in the test stage (KT) at a constant environmental temperature set previously; constant-temperature reservoir control means (7) including a temperature detector (7a), for controlling a set temperature of the heating source (6a) of the constant-temperature reservoir (6) so that the set temperature of the heating source (6a) is higher when the internal environmental temperature is lower than a previously-determined threshold value than when the internal environmental temperature is equal to or higher than the threshold value, based on the internal environmental temperature detected by the temperature detector (7a).Type: ApplicationFiled: July 20, 2015Publication date: January 21, 2016Applicant: SAKAE CO., LTD.Inventors: Masamichi MORIYA, Yasumasa OGINO, Takafumi OKAWARA, Koichi MATSUMOTO, Shigeo ASAMI, Yuichi SHITARA, Kenta TAKAHASHI
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Patent number: 9212268Abstract: This film provides a polyethylene terephthalate film whereby dimensional variation in various steps can be reduced, particularly when the film is used as a substrate film for a flexible device, and that is suitable as a substrate film having minimal curl and excellent appropriateness for processing. This biaxially oriented polyethylene terephthalate film has a degree of crystallinity (Xc) of 0.35 to 0.50, the intrinsic viscosity (IV) of the resin constituting the film is 0.66-1.0 dl/g, the coefficient of thermal expansion at a temperature of 50-170° C. in each of the machine direction and transverse direction of the film is 0.29 ppm/° C., and the degree of thermal shrinkage at 180° C. in each of the machine direction and transverse direction of the film is 0.5%-1.0%.Type: GrantFiled: July 19, 2013Date of Patent: December 15, 2015Assignee: TORAY INDUSTRIES, INC.Inventors: Kenta Takahashi, Tetsuya Machida, Takuji Higashioji
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Patent number: 9106636Abstract: At a time of enrollment, a client terminal: generates a feature polynomial from biometric information for enrollment; multiplies the feature polynomial by a prescribed integer; stores a helper polynomial obtained by multiplying an inverse polynomial of a template polynomial, a polynomial having a small norm; and transmits the template polynomial to an authentication server. The authentication server stores the template polynomial in a storage unit. At a time of authentication, the client terminal: generates a feature polynomial from biometric information for authentication; multiplies the helper polynomial by the feature polynomial; adds a random polynomial having a small norm to the authentication polynomial; and transmits the authentication polynomial to the authentication server.Type: GrantFiled: October 29, 2010Date of Patent: August 11, 2015Assignee: HITACHI, LTD.Inventor: Kenta Takahashi
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Patent number: 9049192Abstract: A biometric authentication method for a computer system, the computer system comprising: a computer; and an authentication server, the biometric authentication method including steps of: extracting a first feature from the captured biometric information; generating a template polynomial for enrollment; extracting a second feature from the captured biometric information; generating a template polynomial for authentication; generating a correlation function for calculating a correlation between the template polynomial for authentication and the enrolled template polynomial; calculating a correlation value between the template polynomial for authentication and the enrolled template polynomial by using the generated correlation function, and determining based on the calculated correlation value whether or not the biometric information at the time of authentication coincides with the biometric information enrolled.Type: GrantFiled: May 29, 2014Date of Patent: June 2, 2015Assignee: HITACHI, LTD.Inventor: Kenta Takahashi
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Publication number: 20150119548Abstract: This film provides a polyethylene terephthalate film whereby dimensional variation in various steps can be reduced, particularly when the film is used as a substrate film for a flexible device, and that is suitable as a substrate film having minimal curl and excellent appropriateness for processing. This biaxially oriented polyethylene terephthalate film has a degree of crystallinity (Xc) of 0.35 to 0.50, the intrinsic viscosity (IV) of the resin constituting the film is 0.66-1.0 dl/g, the coefficient of thermal expansion at a temperature of 50-170° C. in each of the machine direction and transverse direction of the film is 0.29 ppm/° C., and the degree of thermal shrinkage at 180° C. in each of the machine direction and transverse direction of the film is 0.5%-1.0%.Type: ApplicationFiled: July 19, 2013Publication date: April 30, 2015Applicant: TORAY INDUSTRIES, INC.Inventors: Kenta Takahashi, Tetsuya Machida, Takuji Higashioji
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Publication number: 20150057056Abstract: An obtaining unit of a moving control device obtains a first contact position and a second contact position on a touch panel. A determination unit determines information about a trajectory of a moving object in a virtual space based on the first contact position and second contact position. A moving control unit moves the moving object in the virtual space based on the information.Type: ApplicationFiled: August 25, 2014Publication date: February 26, 2015Inventors: Kuka LEE, Kenta TAKAHASHI, Kentaro NAGAYAMA
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Patent number: 8933367Abstract: There is obtained a laser processing method by which an excellent shape of a cut surface can be achieved and an increase in cost can be suppressed. A laser processing method includes the steps of: preparing a material to be processed; and forming a modified area in the material to be processed, by irradiating the material to be processed with laser beam. In the aforementioned step, pulsed laser beam having a continuous spectrum is focused with a lens, thereby forming a focusing line constituted by a plurality of focuses that are obtained by predetermined bands forming the continuous spectrum of the laser beam, and the material to be processed is irradiated with the laser beam such that at least a part of the focusing line is located on a surface of the material to be processed, thereby forming the modified area on an axis of the focusing line.Type: GrantFiled: February 8, 2012Date of Patent: January 13, 2015Assignees: Sumitomo Electric Industries, Ltd., National University Corporation Okayama UniversityInventors: Motoki Kakui, Hiroshi Kohda, Yasuomi Kaneuchi, Shinobu Tamaoki, Shigehiro Nagano, Yoshiyuki Uno, Yasuhiro Okamoto, Kenta Takahashi
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Publication number: 20140281569Abstract: A biometric authentication method for a computer system, the computer system comprising: a computer; and an authentication server, the biometric authentication method including steps of: extracting a first feature from the captured biometric information; generating a template polynomial for enrollment; extracting a second feature from the captured biometric information; generating a template polynomial for authentication; generating a correlation function for calculating a correlation between the template polynomial for authentication and the enrolled template polynomial; calculating a correlation value between the template polynomial for authentication and the enrolled template polynomial by using the generated correlation function, and determining based on the calculated correlation value whether or not the biometric information at the time of authentication coincides with the biometric information enrolled.Type: ApplicationFiled: May 29, 2014Publication date: September 18, 2014Applicant: HITACHI, LTD.Inventor: Kenta TAKAHASHI
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Publication number: 20140224024Abstract: An ultrasonic testing apparatus includes an array probe 3 disposed to face a flange-side rim face 16 of a wheel 1. The ultrasonic testing apparatus also includes an array flaw detector having a function of transmitting transmission-reception control signals to the array probe, and a personal computer having a function of setting various parameters for the array flaw detector, and receiving signals from the array flaw detector so as to generate images such as an A-scope image and a B-scope image. When detecting a flaw, the array probe is disposed in such a manner that a transducer face thereof faces the flange-side rim face. At this time, an angle between the transducer alignment direction of the array probe and the radial direction of the wheel 1 is set to be 20 to 60° when viewed in the axial direction, and the flaw detection is carried out at this angle.Type: ApplicationFiled: June 5, 2012Publication date: August 14, 2014Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hitoshi Murakoshi, Kenta Takahashi