Patents by Inventor Tetsuya Egawa

Tetsuya Egawa 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: 9465730
    Abstract: Different block management values that sequentially increase are set for a plurality of blocks to indicate active states of the blocks. For example, a first block management value “$1111” is stored in a first block, and a second management value “$1112” is stored in a second block. Thus, even when more than one block is in an active state, an updated value is read from the block that stores a larger block management value. This allows for the true updated value to be read.
    Type: Grant
    Filed: May 1, 2012
    Date of Patent: October 11, 2016
    Assignee: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Kazunori Arakawa, Tetsuya Egawa, Hidekazu Adachi
  • Publication number: 20160225207
    Abstract: An electronic key registration system includes an electronic key and a communication master. The electronic key transmits a registration code. The communication master receives the registration code from the electronic key, code, obtains key information using the registration code, and registers the key information. The registration code is set in accordance with the communication master to which the electronic key is registered. The communication master includes a level determination unit, which determines a key registration security level when the electronic key is registered to the communication master, and a registration execution unit, which obtains the key information using the registration code based on the determined key registration security level and registers the key information to the communication master.
    Type: Application
    Filed: January 28, 2016
    Publication date: August 4, 2016
    Applicants: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Daisuke KAWAMURA, Masahiro ARAKAWA, Masaki HAYASHI, Hiroaki IWASHITA, Tetsuya EGAWA, Kazunori ARAKAWA, Ryuta ATSUMI, Chihiro TATEBAYASHI
  • Patent number: 9407436
    Abstract: An immobilizer ECU generates an encryption key using key generating logic, from a SEED code included in an ID code signal sent from an electronic key, and registers the encryption key to the immobilizer ECU. The immobilizer ECU receives an instruction from a registration and deletion tool and sends, to the electronic key, a deletion request signal that requests the deletion of the SEED code. The electronic key deletes the SEED code from the electronic key if a deletion request signal has been received.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: August 2, 2016
    Assignee: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Daisuke Kawamura, Hideki Kawai, Tetsuya Egawa, Hiroaki Iwashita, Toshihiro Nagae, Takeo Endo
  • Patent number: 9397829
    Abstract: A method for registering first and second electronic keys, which are capable of controlling a communication subject, to a controller of the communication subject, wherein the first electronic key is to be initially registered, and the second electronic key is to be additionally registered, the method including: performing an additional key production process including storing, in the second electronic key, an additional encryption key generation code unique to the second electronic key and an additional encryption key that is used to verify the second electronic key; and performing a key additional registration process including obtaining the additional encryption key generation code from the second electronic key when identification information unique to the communication subject is stored in the second electronic key, generating the additional encryption key with an additional encryption key generation logic, and storing the additional encryption key in the controller.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: July 19, 2016
    Assignee: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Hiroaki Iwashita, Hideki Kawai, Tetsuya Egawa, Masaki Hayashi, Toshihiro Nagae, Daisuke Kawamura
  • Patent number: 9392448
    Abstract: A wireless communications system that regularly executes verification between an electronic key and an immobilizer ECU, and sends and receives deletion request signals unrelated to verification, between the electronic key and the immobilizer ECU. The sending and receiving of deletion request signals is executed at intervals between the regularly executed verifications.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: July 12, 2016
    Assignee: KABUSHIKI KAISHA TOKI RIKA DENKI SEISAKUSHO
    Inventors: Daisuke Kawamura, Hideki Kawai, Tetsuya Egawa, Hiroaki Iwashita, Toshihiro Nagae
  • Patent number: 9143320
    Abstract: An electronic key registration system includes a controller of a communication subject, an initial electronic key that communicates with the communication subject and has an initial encryption key generation code, an additional electronic key that communicates with the communication subject, and an information center including an additional encryption key. The initial electronic key holds an initial encryption key generated from the initial encryption key generation code and a logic. The controller holds the logic and identification information of the communication subject. The controller acquires the initial encryption key generation code from the initial electronic key, generates an initial encryption key from the initial encryption key generation code and the logic held by the controller, and stores the initial encryption key. The information center sends the additional encryption key to the additional electronic key or the controller through a network.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: September 22, 2015
    Assignee: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Daisuke Kawamura, Hiroaki Iwashita, Masaki Hayashi, Toshihiro Nagae, Hisashi Kato, Tetsuya Egawa
  • Patent number: 9137658
    Abstract: An offline immobilizer ECU reads an encryption key generation code from an offline additional electronic key and generates an electronic key encryption key for the offline additional electronic key using the encryption key generation code and a communication subject key encryption key held by the immobilizer ECU. The immobilizer ECU stores, in a memory, the generated electronic key encryption key and a key ID code that is read from the offline additional electronic key.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: September 15, 2015
    Assignee: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Daisuke Kawamura, Hiroaki Iwashita, Masaki Hayashi, Toshihiro Nagae, Hisashi Kato, Tetsuya Egawa
  • Patent number: 9094382
    Abstract: An immobilizer ECU transmits a vehicle ID code and a SEED code, which is read from an electronic key, to a data center online. The data center generates an encryption key from the received SEED code and a first logic, and generates a further SEED code from the encryption key, the vehicle ID code, and a second logic. The immobilizer ECU obtains the further SEED code online from the data center, generates the encryption key from the obtained further SEED code, the vehicle ID code, and the second logic, and stores the encryption key.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: July 28, 2015
    Assignee: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Daisuke Kawamura, Hiroaki Iwashita, Masaki Hayashi, Toshihiro Nagae, Hisashi Kato, Tetsuya Egawa
  • Patent number: 9070279
    Abstract: An electronic key registration system includes a controller arranged in a communication subject communicable with an electronic key. A registration tool is in wired or wireless connection with the communication subject. The registration tool registers the electronic key to the controller when receiving a registration permission signal. An information center is connected to a network. The registration tool includes an operator ID acquisition unit that acquires an operator ID from a key registration operator. A communication unit sends the operator ID to the information center through the network. The information center includes an operator ID verification unit that verifies the operator ID received from the registration tool. A permission information notification unit sends, when the operator ID is verified, a registration permission signal to the registration tool through the network to permit the registration tool to perform the registration process.
    Type: Grant
    Filed: April 16, 2013
    Date of Patent: June 30, 2015
    Assignee: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Takahiro Shimizu, Tetsuya Egawa, Akihito Kimura, Toshihiro Nagae, Daisuke Kawamura, Hiroaki Iwashita
  • Patent number: 9021184
    Abstract: In a flash memory device, after an updated value is copied from a first block to a second block, a block management value of the first block is set to an unused state, and maintenance is performed to erase data from the first block. When performing maintenance, the block management value of the first block B1 is rewritten from “$FFF0” to “$FFFF.” When a reset occurs and the power supply is deactivated during the maintenance, the digit of “$0” in the block management value may become “1” to “E” of the hexadecimal system. In this manner, when the block management value includes a single digit of “1” to “E” and three digits of “F,” the reading of an updated value from the block corresponding to the block management value is restricted.
    Type: Grant
    Filed: May 11, 2012
    Date of Patent: April 28, 2015
    Assignee: Kabushiki Kaisha Tokai Rika Denki Seisakusho
    Inventors: Yosuke Ohashi, Kazunori Arakawa, Tetsuya Egawa, Hidekazu Adachi
  • Publication number: 20150010145
    Abstract: A method for registering first and second electronic keys, which are capable of controlling a communication subject, to a controller of the communication subject, wherein the first electronic key is to be initially registered, and the second electronic key is to be additionally registered, the method including: performing an additional key production process including storing, in the second electronic key, an additional encryption key generation code unique to the second electronic key and an additional encryption key that is used to verify the second electronic key; and performing a key additional registration process including obtaining the additional encryption key generation code from the second electronic key when identification information unique to the communication subject is stored in the second electronic key, generating the additional encryption key with an additional encryption key generation logic, and storing the additional encryption key in the controller.
    Type: Application
    Filed: January 18, 2013
    Publication date: January 8, 2015
    Applicant: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Hiroaki Iwashita, Hideki Kawai, Tetsuya Egawa, Masaki Hayashi, Toshihiro Nagae, Daisuke Kawamura
  • Publication number: 20150003613
    Abstract: An immobilizer ECU generates an encryption key using key generating logic, from a SEED code included in an ID code signal sent from an electronic key, and registers the encryption key to the immobilizer ECU. The immobilizer ECU receives an instruction from a registration and deletion tool and sends, to the electronic key, a deletion request signal that requests the deletion of the SEED code. The electronic key deletes the SEED code from the electronic key if a deletion request signal has been received.
    Type: Application
    Filed: January 18, 2013
    Publication date: January 1, 2015
    Inventors: Daisuke Kawamura, Hideki Kawai, Tetsuya Egawa, Hiroaki Iwashita, Toshihiro Nagae, Takeo Endo
  • Publication number: 20140359292
    Abstract: A method for registering a first electronic key, which is capable of controlling a communication subject, to a controller of the communication subject, the method including: performing an initial production process including storing identification information unique to the communication subject in the controller, and storing an encryption key generation code unique to the first electronic key and an encryption key that is used to verify the first electronic key in the first electronic key; and performing an initial registration process including writing the identification information stored in the controller to the first electronic key, obtaining the encryption key generation code from the first electronic key, generating the encryption key with an encryption key generation logic that uses the encryption key generation code, storing the encryption key in the controller, and storing encryption key information related to the encryption key in a database in association with the identification information.
    Type: Application
    Filed: January 18, 2013
    Publication date: December 4, 2014
    Inventors: Daisuke Kawamura, Hideki Kawai, Tetsuya Egawa, Hiroaki Iwashita, Toshihiro Nagae, Masaki Hayashi
  • Publication number: 20140355761
    Abstract: A wireless communications system that regularly executes verification between an electronic key and an immobilizer ECU, and sends and receives deletion request signals unrelated to verification, between the electronic key and the immobilizer ECU. The sending and receiving of deletion request signals is executed at intervals between the regularly executed verifications.
    Type: Application
    Filed: January 18, 2013
    Publication date: December 4, 2014
    Inventors: Daisuke Kawamura, Hideki Kawai, Tetsuya Egawa, Hiroaki Iwashita, Toshihiro Nagae
  • Publication number: 20140232521
    Abstract: A method for registering an electronic key includes storing an electronic key ID and an encryption code in a controller to register the electronic key to the controller, and associating a communication subject ID, which is unique to a communication subject, with a controller ID, which is unique to the controller storing the electronic key ID and the encryption code, and the electronic key ID.
    Type: Application
    Filed: February 6, 2014
    Publication date: August 21, 2014
    Applicant: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Daisuke KAWAMURA, Hiroaki IWASHITA, Masaki HAYASHI, Masaki OSHIMA, Tetsuya EGAWA, Kazunori ARAKAWA
  • Publication number: 20130332736
    Abstract: An immobilizer ECU transmits a vehicle ID code and a SEED code, which is read from an electronic key, to a data center online. The data center generates an encryption key from the received SEED code and a first logic, and generates a further SEED code from the encryption key, the vehicle ID code, and a second logic. The immobilizer ECU obtains the further SEED code online from the data center, generates the encryption key from the obtained further SEED code, the vehicle ID code, and the second logic, and stores the encryption key.
    Type: Application
    Filed: May 28, 2013
    Publication date: December 12, 2013
    Applicant: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Daisuke KAWAMURA, Hiroaki IWASHITA, Masaki HAYASHI, Toshihiro NAGAE, Hisashi KATO, Tetsuya EGAWA
  • Publication number: 20130329890
    Abstract: An offline immobilizer ECU reads an encryption key generation code from an offline additional electronic key and generates an electronic key encryption key for the offline additional electronic key using the encryption key generation code and a communication subject key encryption key held by the immobilizer ECU. The immobilizer ECU stores, in a memory, the generated electronic key encryption key and a key ID code that is read from the offline additional electronic key.
    Type: Application
    Filed: May 28, 2013
    Publication date: December 12, 2013
    Inventors: Daisuke KAWAMURA, Hiroaki IWASHITA, Masaki HAYASHI, Toshihiro NAGAE, Hisashi KATO, Tetsuya EGAWA
  • Publication number: 20130301829
    Abstract: An electronic key registration system includes a controller of a communication subject, an initial electronic key that communicates with the communication subject and has an initial encryption key generation code, an additional electronic key that communicates with the communication subject, and an information center including an additional encryption key. The initial electronic key holds an initial encryption key generated from the initial encryption key generation code and a logic. The controller holds the logic and identification information of the communication subject. The controller acquires the initial encryption key generation code from the initial electronic key, generates an initial encryption key from the initial encryption key generation code and the logic held by the controller, and stores the initial encryption key. The information center sends the additional encryption key to the additional electronic key or the controller through a network.
    Type: Application
    Filed: May 1, 2013
    Publication date: November 14, 2013
    Applicant: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Daisuke KAWAMURA, Hiroaki IWASHITA, Masaki HAYASHI, Toshihiro NAGAE, Hisashi KATO, Tetsuya EGAWA
  • Publication number: 20130285792
    Abstract: An electronic key registration system includes a controller arranged in a communication subject communicable with an electronic key. A registration tool is in wired or wireless connection with the communication subject. The registration tool registers the electronic key to the controller when receiving a registration permission signal. An information center is connected to a network. The registration tool includes an operator ID acquisition unit that acquires an operator ID from a key registration operator. A communication unit sends the operator ID to the information center through the network. The information center includes an operator ID verification unit that verifies the operator ID received from the registration tool. A permission information notification unit sends, when the operator ID is verified, a registration permission signal to the registration tool through the network to permit the registration tool to perform the registration process.
    Type: Application
    Filed: April 16, 2013
    Publication date: October 31, 2013
    Applicant: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Takahiro SHIMIZU, Tetsuya EGAWA, Akihito KIMURA, Toshihiro NAGAE, Daisuke KAWAMURA, Hiroaki IWASHITA
  • Publication number: 20120297124
    Abstract: In a flash memory device, after an updated value is copied from a first block to a second block, a block management value of the first block is set to an unused state, and maintenance is performed to erase data from the first block. When performing maintenance, the block management value of the first block B1 is rewritten from “$FFF0” to “$FFFF.” When a reset occurs and the power supply is deactivated during the maintenance, the digit of “$0” in the block management value may become “1” to “E” of the hexadecimal system. In this manner, when the block management value includes a single digit of “1” to “E” and three digits of “F,” the reading of an updated value from the block corresponding to the block management value is restricted.
    Type: Application
    Filed: May 11, 2012
    Publication date: November 22, 2012
    Applicant: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Yosuke OHASHI, Kazunori ARAKAWA, Tetsuya EGAWA, Hidekazu ADACHI