Patents Assigned to Mitsubishi Corporation
  • Patent number: 6660084
    Abstract: A method of growing a 4H-poly type SiC single crystal 40, characterized in that the 4H-poly type SiC single crystal 40 is grown on a seed crystal 30 comprised of an SiC single crystal where a {03-38} plane 30u or a plane which is inclined at off angle &agr;, within about 10°, with respect to the {03-38} plane, is exposed.
    Type: Grant
    Filed: February 27, 2002
    Date of Patent: December 9, 2003
    Assignees: Sixon, Inc., Kansai Electric Power C.C., Inc., Mitsubishi Corporation
    Inventors: Hiromu Shiomi, Tsunenobu Kimoto, Hiroyuki Matsunami
  • Publication number: 20030144963
    Abstract: A data copyright management system comprises a database for storing original data, a key control center for managing crypt keys, copyright management center for managing data copyrights, and a communication network for connecting these sections. Data supplied from the database to users is encrypted and distributed. The users decrypts the encrypted data by crypt keys obtained from the key control center or copyright management center. To supply data to users, there are the following two methods: a one way supplying of encrypted data to users by means of broadcasting or the like; and two-way supplying of encrypted data to users corresponding to users' requests. A crypt key system used for encrypting data uses a secret-key cryptosystem, a public-key cryptosystem or a cryptosystem combining a secret-key and a public-key and further uses a copyright control program to control data copyrights.
    Type: Application
    Filed: January 28, 2003
    Publication date: July 31, 2003
    Applicant: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Publication number: 20030141200
    Abstract: The invention provides a system and a method for generating high pressure hydrogen that is able to efficiently and safely generate hydrogen only by electrolysis of water even by using an electric power generated by a frequently varying natural energy such as sunlight without using any compressors. The system comprises an electrolysis cell using polyelectrolyte membranes, particularly a double-polarity multi-layered type electrolysis cell having a specified structure is disposed in a vessel for storing generated hydrogen, preferably for storing cooled hydrogen under a high pressure hydrogen atmosphere. High pressure hydrogen is generated by electrolysis of pure water using the electrolysis cell by suppressing the pressure applied to the cell to a pressure below the pressure resistance of the cell using a differential pressure sensor and pressure controller.
    Type: Application
    Filed: January 29, 2003
    Publication date: July 31, 2003
    Applicant: Mitsubishi Corporation
    Inventor: Hiroyuki Harada
  • Patent number: 6540853
    Abstract: An absorbent composite sheet mainly consisting of a fibrous substrate web, a super absorbent polymer, and a bonding component bonding both of them with each other, wherein (a) the fibrous substrate web is a non-bonded web with a few of the constituent fibers bonded with each other, (b) a liquid mixture system is used of a medium mainly consisting of the super absorbent polymer and the bonding component, (c) a composite web is formed by adding the liquid mixture system to the fibrous substrate web, and (d) a liquid component is separated from the composite web so that fixing of the super absorbent polymer to the fibrous substrate web and bonding of the webs of the fibrous substrate web with one another are carried out at the same time. Methods of manufacturing such absorbent composite sheets are also provided.
    Type: Grant
    Filed: January 18, 2001
    Date of Patent: April 1, 2003
    Assignees: Japan Absorbent Technology Institute, Mitsubishi Corporation
    Inventors: Migaku Suzuki, Shingo Mori
  • Publication number: 20030012385
    Abstract: A data copyright management system comprises a database for storing original data, a key control center for managing crypt keys, copyright management center for managing data copyrights, and a communication network for connecting these sections. Data supplied from the database to users is encrypted and distributed. The users decrypts the encrypted data by crypt keys obtained from the key control center or copyright management center. To supply data to users, there are the following two methods: a one-way supplying of encrypted data to users by means of broadcasting or the like; and two-way supplying of encrypted data to users corresponding to users' requests. A crypt key system used for encrypting data uses a secret-key cryptosystem, a public-key cryptosystem or a cryptosystem combining a secret-key and a public-key and further uses a copyright control program to control data copyrights.
    Type: Application
    Filed: August 26, 2002
    Publication date: January 16, 2003
    Applicant: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6506353
    Abstract: Iron carbide is produced by an apparatus comprising first fluidized bed reactor 4 and second fluidized bed reactor 5, wherein the charged grainy iron oxide is reduced and carburized by the high temperature and high pressure gas being introduced from the bottom of the reactor. Both fluidized bed reactors comprise chamber 23 for introducing gas into the reactor, distribution plate 27 having multiple gas-introducing nozzles 28, partition plate 26 partitioning the fluidized bed into plural division rooms, and gas supply inlet 25a, 25b arranged on chamber 23 for supplying gas to specific division room respectively. Each gas supply inlet is connected to gas supply line having a gas flow control valve for controlling gas pressure or gas flow rate.
    Type: Grant
    Filed: March 31, 1999
    Date of Patent: January 14, 2003
    Assignees: Kawasaki Jukogyo Kabushiki Kaisha, Mitsubishi Corporation
    Inventors: Junya Nakatani, Yoshio Uchiyama, Eiji Inoue, Torakatsu Miyashita
  • Publication number: 20020178372
    Abstract: A system is provided which manages the copyright of a plurality of data in a database. A data copyright management system is provided in which a primary user edits data which he or she obtains and supplies edited data to a secondary user. In a case where new data is produced by editing a plurality of encrypted data obtained from the database, and is encrypted for distribution to another person, crypt keys for a plurality of data as raw material and an edit program which is an editing process with a digital signature are used as a use permit key. The system comprises a database and a key control center, and uses a primary copyright label, a first use permit key including a first crypt key, a second use permit key, a third crypt key, and a copyright management program. The primary user uses primary copyrighted data encrypted using the first crypt key, by decrypting it with the first use permit key obtained from the key control center.
    Type: Application
    Filed: May 23, 2002
    Publication date: November 28, 2002
    Applicant: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6463536
    Abstract: A system is provided which manages the copyright of a plurality of data in a database. A data copyright management system is provided in which a primary user edits data which he or she obtains and supplies edited data to a secondary user. In a case where new data is produced by editing a plurality of encrypted data obtained from the database, and is encrypted for distribution to another person, crypt keys for a plurality of data as raw material and an edit program which is an editing process with a digital signature are used as a use permit key. When a user who receives the edited and encrypted data requests use of the data by presenting the digital signature to a copyright management center, the copyright management center identifies the editor by the digital signature, and provides the user requiring use of data with the crypt key for use only when the editor is identified to be the valid user of the edited data.
    Type: Grant
    Filed: June 5, 2001
    Date of Patent: October 8, 2002
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6449717
    Abstract: A data copyright management system comprises a database for storing original data, a key control center for managing crypt keys, copyright management center for managing data copyrights, and a communication network for connecting these sections. Data supplied from the database to users is encrypted and distributed. The users decrypts the encrypted data by crypt keys obtained from the key control center or copyright management center. To supply data to users, there are the following two methods: a one-way supplying of encrypted data to users by means of broadcasting or the like; and two-way supplying of encrypted data to users corresponding to users' requests. A crypt key system used for encrypting data uses a secret-key cryptosystem, a public-key cryptosystem or a cryptosystem combining a secret-key and a public-key and further uses a copyright control program to control data copyrights.
    Type: Grant
    Filed: January 3, 2000
    Date of Patent: September 10, 2002
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6438694
    Abstract: A data copyright management apparatus for handling data copyrights, and data of digital cash and video conference system is provided. The data copyright management apparatus comprises a CPU, ROM, EEPROM, and RAM. The ROM, EEPROM, and RAM are connected to the CPU bus, and a system bus of a device which utilizes the data can be connected to the CPU bus. A data copyright management system program, cryptographic algorithm, and user information are stored in the ROM, and a first public-key, a first private-key, a second public-key, a second private-key, a first secret-key, a second secret-key, and copyright information are stored in the EEPROM. The data copyright management apparatus may be configured in the form of a monolithic or hybrid IC, a thin IC card, PC card, insertion board, and further, may be incorporated in a computer, television set, set-top box, digital video tape recorder, digital video disk recorder, digital audio tape apparatus, or personal digital assistants, and the like.
    Type: Grant
    Filed: January 25, 2001
    Date of Patent: August 20, 2002
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Publication number: 20020112173
    Abstract: A data copyright management apparatus for handling data copyrights, and data of digital cash and video conference system is provided. The data copyright management apparatus comprises a CPU, ROM, EEPROM, and RAM. The ROM, EEPROM, and RAM are connected to the CPU bus, and a system bus of a device which utilizes the data can be connected to the CPU bus. A data copyright management system program, cryptographic algorithm, and user information are stored in the ROM, and a first public-key, a first private-key, a second public-key, a second private-key, a first secret-key, a second secret-key, and copyright information are stored in the EEPROM. The data copyright management apparatus may be configured in the form of a monolithic or hybrid IC, a thin IC card, PC card, insertion board, and further, may be incorporated in a computer, television set, set-top box, digital video tape recorder, digital video disk recorder, digital audio tape apparatus, or personal digital assistants, and the like.
    Type: Application
    Filed: March 26, 2002
    Publication date: August 15, 2002
    Applicant: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6424715
    Abstract: There are provided a digital content management apparatus which further embodies a digital content management apparatus used with a user terminal, and a system which protects the secrets of a digital content. The system and the apparatus are a real time operating system using a microkernel, which is incorporated in the digital content management apparatus as an interruption process having high priority. When a user uses the digital content, whether there is an illegitimate usage or not, is watched by interrupting the usage process. In the case where illegitimate usage is carried out, a warning is given or the usage is stopped. The decryption/re-encryption functions of the digital content management apparatus having the decryption/re-encryption functions are not restricted to the inside of the user apparatus. By providing the decryption/re-encryption functions between the networks, the exchange of secret information between different networks is secured.
    Type: Grant
    Filed: June 3, 1997
    Date of Patent: July 23, 2002
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6416728
    Abstract: Provided is a method for producing iron carbide in which free carbon is generated with difficulty. When iron carbide is produced by reducing and carburizing iron-containing raw materials for iron making using a reaction gas mainly containing hydrogen and methane, steam or carbon dioxide is added into fluidized bed reactor (1) through line (7) in addition to the reaction gas supplied from line (2) into reactor (1) corresponding to a quantity of free carbon generated in reactor (1) which is obtained by means of dust meter (9). Consequently, the generation of the free carbon can be controlled.
    Type: Grant
    Filed: August 10, 1999
    Date of Patent: July 9, 2002
    Assignees: Kawasaki Jukogyo Kabushiki Kaisha, Mitsubishi Corporation
    Inventors: Eiji Inoue, Torakatsu Miyashita, Yoshio Uchiyama, Junya Nakatani, Teruyuki Nakazawa, Akio Nio
  • Patent number: 6408390
    Abstract: A data copyright management apparatus for handling data copyrights, and data of digital cash and video conference system is provided. The data copyright management apparatus comprises a CPU, ROM, EEPROM, and RAM. The ROM, EEPROM, and RAM are connected to the CPU bus, and a system bus of a device which utilizes the data can be connected to the CPU bus. A data copyright management system program, crypt algorithm, and user information are stored in the ROM, and a first public-key, a first private-key, a second public-key, a second private-key, a first secret-key, a second secret-key, a copyright information are stored in the EEPROM. The data copyright management apparatus may be configured in the form of a monolithic or hybrid IC, a thin IC card, PC card, insertion board, and further, may be incorporated in a computer, television set, set-top box, digital video tape recorder, digital video disk recorder, digital audio tape apparatus, or personal digital assistants, and the like.
    Type: Grant
    Filed: August 16, 1999
    Date of Patent: June 18, 2002
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Publication number: 20020059238
    Abstract: To prevent piracy or leakage of data content, a cryptography technique and electronic watermark technique are combined together and used. In a data content supplied to a user, a user data is entered as electronic watermark by a data management center, and the data content with an electronic watermark entered in it is encrypted using a crypt key and is supplied. The encrypted data content is decrypted using a crypt key distributed from the data management center and is used. In case it is to be stored, it is encrypted using another crypt key. In case the data content is copied and transferred to other user, a user data of the other user is entered as electronic watermark, and a scenario to enter the user data of the other user as electronic watermark is registered at the data management center, and the data content with electronic watermark entered in it is encrypted using another crypt key and is supplied.
    Type: Application
    Filed: November 2, 2001
    Publication date: May 16, 2002
    Applicant: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Publication number: 20020052850
    Abstract: There are provided a digital content management apparatus which further embodies a digital content management apparatus used with a user terminal, and a system which protects the secrets of a digital content. The system and the apparatus are a real time operating system using a micro-kernel, which is incorporated in the digital content management apparatus as an interruption process having high priority. When a user uses the digital content, whether there is an illegitimate usage or not, is watched by interrupting the usage process. In the case where illegitimate usage is carried out, a warning is given or the usage is stopped. The decryption/re-encryption functions of the digital content management apparatus having the decryption/re-encryption functions are not restricted to the inside of the user apparatus. By providing the decryption/re-encryption functions between the networks, the exchange of secret information between different networks is secured.
    Type: Application
    Filed: December 13, 2001
    Publication date: May 2, 2002
    Applicant: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Publication number: 20020025044
    Abstract: The present invention provides a system to ensure security of data in a computer network system. A center certifies a public-key of user of the system and distributes a secret-key. A first system comprises the center in a network, an information provider and a plurality of users. The center identifies utilization status by requests of the secret-key. The data is encrypted by the secret-key and is stored and transferred, while the data to be stored and transferred is encrypted by a secret-key different from the secret-key of the transferred data. An original data label is added to the original data, and an edit label is added to the edited data, and the center does not store the data and stores only the original data label and the edit label. A second system comprises a center and an information provider in a network, and a plurality of users utilizing the network. The center stores the original data and editing scenario, and also the original data label, user label and edit label.
    Type: Application
    Filed: November 2, 2001
    Publication date: February 28, 2002
    Applicant: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Publication number: 20020021807
    Abstract: The present invention provides a method for controlling copyrights of digital data in a database system including real time transmission of a digital picture. Copyrights are controlled using one or more of the following, as necessary, in addition to a permit key: a copyright control program, copyright information or copyright control message. The copyright control program, the copyright information and the copyright control message are supplied together with the permit key, or they are supplied together with the data. Otherwise, a part of them is supplied together with the permit key and the other part of them is supplied together with the data. The data, the permit key, the copyright control message, the copyright information and the copyright control program are (1) transmitted while encrypted, but are decrypted when used, or (2) they are transmitted while encrypted and decrypted for display only, otherwise remaining encrypted, or (3) they may not be encrypted at all.
    Type: Application
    Filed: November 2, 2001
    Publication date: February 21, 2002
    Applicant: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6343283
    Abstract: A data copyright management system is provided, in which a primary user edits a received data and supplies the edited data to a secondary user. The copyright management system comprises a database and a key control center, and uses a primary copyright label, a primary use permit key including a first crypt key, a secondary use permit key, a third crypt key, and a copyright management program. The primary user decrypts the copyrighted primary data, which is encrypted using the first crypt key and supplied, to plaintext using a primary use permit key obtained from the key control center and utilizes it. If the copyrighted primary data is stored in a primary user device, it is re-encrypted using the primary use permit key. The primary user receives a secondary use permit key for editing the copyrighted primary data from the key control center and edits the copyrighted primary data. The data being edited is encrypted using the secondary use permit key and is stored.
    Type: Grant
    Filed: March 17, 2000
    Date of Patent: January 29, 2002
    Assignees: Mitsubishi Corporation, Mitsubishi Electric Corporation
    Inventors: Makoto Saito, Shoichi Okazaki
  • Publication number: 20010028363
    Abstract: Provided is a file storing-and-managing method and device, for receiving, storing and managing electronic files over the Internet, the method and device including an effective and easy-to-operate GUI which can be operated visually and intuitionally without causing any stress. The file-managing device sends a graphical operation page to a user-computer connected over the Internet. The operation page includes a description (5) of the structure showing how the received-files are stored in the file-managing device and a description (7) of the structure showing how local files are stored in the user-computer, so that a user can easily upload and download files through graphical and intuitional operations of this page. Further, the file-managing device creates preview image data which is provided for previewing of the received-file and which has a data-size smaller than the original received-file. This preview image data is associated to and managed with the original received-file.
    Type: Application
    Filed: December 19, 2000
    Publication date: October 11, 2001
    Applicant: Mitsubishi Corporation and Starnet Co., Ltd.
    Inventors: Junichi Nomoto, Ryuichi Noshiro, Akira Atsumi, Masataka Yamamoto, Kazuo Matsuda