Patents by Inventor Yoko Kumagai

Yoko Kumagai 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).

  • Publication number: 20240109061
    Abstract: According to an embodiment of the present disclosure, there is provided a microplate including at least one (or a plurality of) well and an electrochemical sensor.
    Type: Application
    Filed: January 21, 2022
    Publication date: April 4, 2024
    Inventors: Norikazu KATAYAMA, Yoko KUMAGAI, Narushi ITO
  • Publication number: 20240053352
    Abstract: An embodiment according to the present disclosure provides a method for evaluating a degree of glycation of a protein, the method including providing a solution potentially containing a target protein, bringing the solution into contact with a color indicator, bringing the solution into contact with protease, using a first reaction between the color indicator and the target protein to determine a concentration of the target protein in the solution, using a second reaction between the protease and the target protein to determine a concentration of the target protein having been glycated, and determining, based on the concentration of the target protein and the concentration of the target protein having been glycated, a degree of glycation of the target protein.
    Type: Application
    Filed: January 21, 2022
    Publication date: February 15, 2024
    Inventors: Norikazu KATAYAMA, Yoko KUMAGAI, Narushi ITO, Noriko MIYAUCHI
  • Publication number: 20220382711
    Abstract: A data analysis system (S) including a data analysis server (11), a data retention system (12) which retains data to be analyzed, and an analysis terminal (14). The data analysis server (11) sends to the data retention system (12), according to an analysis demand from the analysis terminal (14), an analysis request of the data based on a requirement to be satisfied by analysis of the data, and sends to the analysis terminal (14) an analysis result of the data based on the requirement received from the data retention system (12). The data retention system (12) analyzes the data based on the requirement according to the analysis request and sends an analysis result to the analysis terminal (14).
    Type: Application
    Filed: December 4, 2020
    Publication date: December 1, 2022
    Inventors: Yoko KUMAGAI, Tadashi KAJI, Shigeyuki TANI, Hiroki UCHIYAMA, Anirban BASU, Chiaki OTAHARA
  • Publication number: 20210326315
    Abstract: Provided is an information recommendation system that includes a trust management framework that generates alternatives of information that has a history and is evaluated, based on a perspective about adoption criteria for evaluation of the information input to search the information, and criteria for ranking the information, being input to search the information.
    Type: Application
    Filed: March 26, 2021
    Publication date: October 21, 2021
    Inventors: Anirban BASU, Yoko KUMAGAI
  • Patent number: 8516245
    Abstract: A validation authority for certificates searches for and verifies paths and certificate revocation lists periodically, and classifies the paths into valid paths and invalid paths in accordance with the results of the validations, so as to register the paths in databases beforehand. Besides, in a case where a request for authenticating the validity of a certificate has been received from an end entity, the validation authority judges the validity of the public key certificate by checking in which of the valid-path database and the invalid-path database a path corresponding to the request is registered. On the other hand, in a case where the path corresponding to the validity authentication request is not registered in either of the databases, the validity of the public key certificate is authenticated by performing path search and validation anew.
    Type: Grant
    Filed: June 19, 2009
    Date of Patent: August 20, 2013
    Assignee: Hitachi, Ltd.
    Inventors: Yoko Kumagai, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
  • Publication number: 20090259842
    Abstract: A validation authority for certificates searches for and verifies paths and certificate revocation lists periodically, and classifies the paths into valid paths and invalid paths in accordance with the results of the validations, so as to register the paths in databases beforehand. Besides, in a case where a request for authenticating the validity of a certificate has been received from an end entity, the validation authority judges the validity of the public key certificate by checking in which of the valid-path database and the invalid-path database a path corresponding to the request is registered. On the other hand, in a case where the path corresponding to the validity authentication request is not registered in either of the databases, the validity of the public key certificate is authenticated by performing path search and validation anew.
    Type: Application
    Filed: June 19, 2009
    Publication date: October 15, 2009
    Applicants: Hitachi, Ltd
    Inventors: Yoko KUMAGAI, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
  • Patent number: 7558952
    Abstract: A validation authority for certificates searches for and verifies paths and certificate revocation lists periodically, and classifies the paths into valid paths and invalid paths in accordance with the results of the validations, so as to register the paths in databases beforehand. Besides, in a case where a request for authenticating the validity of a certificate has been received from an end entity, the validation authority judges the validity of the public key certificate by checking in which of the valid-path database and the invalid-path database a path corresponding to the request is registered. On the other hand, in a case where the path corresponding to the validity authentication request is not registered in either of the databases, the validity of the public key certificate is authenticated by performing path search and validation anew.
    Type: Grant
    Filed: March 1, 2004
    Date of Patent: July 7, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Yoko Kumagai, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
  • Patent number: 7533269
    Abstract: In response to a sign request including a digital document from a document-creating device 10, a digital-signed-document exchange supporting server 30 canonicalizes the digital document, calculates a digest value thereof, and returns the digest value to the document creating device. When the document-creating device transmits a digital sign created by encrypting the digest value to the digital-signed-digital document exchange-supporting server 30, the server 30 creates a digital-signed document from the digital sign and the digital document, and returns the document to the document-creating device. On the other hand, in response to a validation request including a digital-signed-digital document and a public key from a sign validating device 20, the server 30 compares a value resulting from the decryption of the digital sign with the public key and a digest value of the digital document canonicalized and returns the result to the sign validating device.
    Type: Grant
    Filed: January 31, 2005
    Date of Patent: May 12, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Yoko Kumagai, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
  • Patent number: 7409553
    Abstract: A public key certificate generation method includes the steps of: sending a certificate issuing request including a registration contents of a public key certificate and an information content guaranteed by the registration authority, to the issuing authority in a registration authority and generating a public key certificate including the registration contents described in the certificate issuing request the information guaranteed by the registration authority issuing contents issued by the issuing authority, and a signature to the issuing contents in the issuing authority.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: August 5, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Yoko Kumagai, Takahiro Fujishiro, Satoru Tezuka, Takanobu Oikawa, Izumi Anayama
  • Patent number: 7409551
    Abstract: A time period which is expended since a request for the authentication of the validity of a public key certificate till the authentication of the validity, is shortened. A certificate validity authentication center VC periodically searches for and verifies paths which extend from a bridge certification authority CAbridge to individual terminal admitting certification authorities CA, and it registers the paths whose verifications have held good, in a path database in association with the respective terminal admitting certification authorities CA.
    Type: Grant
    Filed: June 14, 2006
    Date of Patent: August 5, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Fujishiro, Satoru Tezuka, Yoko Kumagai, Tomoharu Morio, Yutaka Miyazaki
  • Patent number: 7392380
    Abstract: If a CRL is cached for an increased speed of a certificate validation process, when a certification authority issues a CRL in an urgent situation, the accuracy of the certificate validation result cannot be secured because the cached CRL is not the latest one. This problem is solved as follows. When it issues a CRL, the certification authority sends a CRL issuance notification to certificate validation servers. The certificate validation servers that received the CRL issuance notification cache the latest CRL. Thus, the accuracy of the certificate validation result can be secured.
    Type: Grant
    Filed: June 9, 2003
    Date of Patent: June 24, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Tadashi Kaji, Takahiro Fujishiro, Yoko Kumagai, Shingo Hane, Hiromi Nagano
  • Publication number: 20060242413
    Abstract: A time period which is expended since a request for the authentication of the validity of a public key certificate till the authentication of the validity, is shortened. A certificate validity authentication center VC periodically searches for and verifies paths which extend from a bridge certification authority CAbridge to individual terminal admitting certification authorities CA, and it registers the paths whose verifications have held good, in a path database in association with the respective terminal admitting certification authorities CA.
    Type: Application
    Filed: June 14, 2006
    Publication date: October 26, 2006
    Inventors: Takahiro Fujishiro, Satoru Tezuka, Yoko Kumagai, Tomoharu Morio, Yutaka Miyazaki
  • Publication number: 20060168650
    Abstract: In response to a sign request including a digital document from a document-creating device 10, a digital-signed-document exchange supporting server 30 canonicalizes the digital document, calculates a digest value thereof and returns the digest value to the document creating device. When the document-creating device transmits a digital sign created by encrypting the digest value to the digital-signed-digital document exchange-supporting server 30, the digital-signed-digital document exchange-supporting server 30 creates a digital-signed document from the digital sign and the digital document and returns the document to the document-creating device.
    Type: Application
    Filed: January 31, 2005
    Publication date: July 27, 2006
    Inventors: Yoko Kumagai, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
  • Patent number: 7080251
    Abstract: A time period which is expended since a request for the authentication of the validity of a public key certificate till the authentication of the validity, is shortened. A certificate validity authentication center VC periodically searches for and verifies paths which extend from a bridge certification authority CAbridge to individual terminal admitting certification authorities CA, and it registers the paths whose verifications have held good, in a path database in association with the respective terminal admitting certification authorities CA.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: July 18, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Fujishiro, Satoru Tezuka, Yoko Kumagai, Tomoharu Morio, Yutaka Miyazaki
  • Publication number: 20050081037
    Abstract: A validation authority for certificates searches for and verifies paths and certificate revocation lists periodically, and classifies the paths into valid paths and invalid paths in accordance with the results of the validations, so as to register the paths in databases beforehand. Besides, in a case where a request for authenticating the validity of a certificate has been received from an end entity, the validation authority judges the validity of the public key certificate by checking in which of the valid-path database and the invalid-path database a path corresponding to the request is registered. On the other hand, in a case where the path corresponding to the validity authentication request is not registered in either of the databases, the validity of the public key certificate is authenticated by performing path search and validation anew.
    Type: Application
    Filed: March 1, 2004
    Publication date: April 14, 2005
    Inventors: Yoko Kumagai, Takahiro Fujishiro, Tadashi Kaji, Shingo Hane, Hitoshi Shimonosono
  • Publication number: 20040255116
    Abstract: The present invention provides a technology for verifying the validity of an electronic document by using a signature affixed to the electronic document at the time of its creation even if the electronic document is partially rendered private at the time of its disclosure. An target electronic document is divided into two or more partial documents having an arbitrary or fixed length. This division is effected by using a tag of XML or other markup language so as to provide versatility or by adding a dedicated delimiter for division. The system has a signature function. The signature function uses a signature technique for generating the information for verifying the validity of each of the partial documents, and validating a signature affixed to the electronic document to confirm the validity of the whole electronic document by affixing a signature to the aggregate of the generated validity confirmation information.
    Type: Application
    Filed: August 20, 2003
    Publication date: December 16, 2004
    Inventors: Shingo Hane, Takahiro Fujishiro, Tadashi Kaji, Yoko Kumagai, Junichi Takeuchi
  • Publication number: 20040111609
    Abstract: If a CRL is cached for an increased speed of a certificate validation process, when a certification authority issues a CRL in an urgent situation, the accuracy of the certificate validation result cannot be secured because the cached CRL is not the latest one. This problem is solved as follows. When it issues a CRL, the certification authority sends a CRL issuance notification to certificate validation servers. The certificate validation servers that received the CRL issuance notification cache the latest CRL. Thus, the accuracy of the certificate validation result can be secured.
    Type: Application
    Filed: June 9, 2003
    Publication date: June 10, 2004
    Inventors: Tadashi Kaji, Takahiro Fujishiro, Yoko Kumagai, Shingo Hane, Hiromi Nagano
  • Publication number: 20030097566
    Abstract: A public key certificate generation method includes the steps of: sending a certificate issuing request including a registration contents of a public key certificate and an information content guaranteed by the registration authority, to the issuing authority in a registration authority and generating a public key certificate including the registration contents described in the certificate issuing request the information guaranteed by the registration authority issuing contents issued by the issuing authority, and a signature to the issuing contents in the issuing authority.
    Type: Application
    Filed: February 19, 2002
    Publication date: May 22, 2003
    Inventors: Yoko Kumagai, Takahiro Fujishiro, Satoru Tezuka, Takanobu Oikawa, Izumi Anayama
  • Publication number: 20020046340
    Abstract: A time period which is expended since a request for the authentication of the validity of a public key certificate till the authentication of the validity, is shortened. A certificate validity authentication center VC periodically searches for and verifies paths which extend from a bridge certification authority CAbridge to individual terminal admitting certification authorities CA, and it registers the paths whose verifications have held good, in a path database in association with the respective terminal admitting certification authorities CA.
    Type: Application
    Filed: August 30, 2001
    Publication date: April 18, 2002
    Inventors: Takahiro Fujishiro, Satoru Tezuka, Yoko Kumagai, Tomoharu Morio, Yutaka Miyazaki