Patents Assigned to Mitsubishi Corporation
  • Publication number: 20010027522
    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: Application
    Filed: June 5, 2001
    Publication date: October 4, 2001
    Applicant: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Publication number: 20010013021
    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: January 25, 2001
    Publication date: August 9, 2001
    Applicant: Mitsubishi Corporation
    Inventor: Mokoto Saito
  • Patent number: 6270741
    Abstract: Provided is a method for managing an operation of a producing process for obtaining an iron carbide product having a goal composition in a two-stages reaction process. A first-stage reaction process for partially reducing an iron-containing material for iron making is carried out, and a second-stage reaction process for performing further reduction and carburization is then carried out. A solid sample is taken at an outlet of a reactor for the first-stage reaction process to measure a reduction ratio of the solid sample. By regulating a parameter capable of changing a reduction ratio of the first-stage reaction process, an IC ratio obtained after the second-stage reaction process can be adjusted.
    Type: Grant
    Filed: August 6, 1999
    Date of Patent: August 7, 2001
    Assignee: Kawasaki Jukogyo Kabushiki Kaisha Mitsubishi Corporation
    Inventors: Eiji Inoue, Torakatsu Miyashita, Yoshio Uchiyama, Junya Nakatani, Teruyuki Nakazawa, Akio Nio
  • Patent number: 6272635
    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: April 10, 2000
    Date of Patent: August 7, 2001
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6193699
    Abstract: A medical tube made of an organic polymer having a mechanical loss tangent of at least 0.5 at body temperature and a modulus of transverse elasticity of 1-1000 MPa at body temperature. The medical tube of the present invention can be easily inserted into the body, and gives less pain and less feeling of physical disorder during indwelling in the body or removal from the body.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: February 27, 2001
    Assignees: Nissho Corporation, Mitsubishi Jukogyo Kabushiki Kaisha, Mitsubishi Cable Industries, Ltd., Mitsubishi Corporation
    Inventors: Takashi Matsumoto, Hajime Tsujikawa, Shunichi Hayashi, Satoru Kondo, Atsushi Utsumi, Tamotsu Kaide
  • Patent number: 6182218
    Abstract: A system for managing a digital content, particularly a digital content to which a copyright is claimed, and a system for supplying a public-key which is used in the management of the digital content are provided. The digital content management program is embedded to an operating system of a user apparatus as a micro kernel, a watch program or a watch command which is linked to the digital content management program is transmitted to the user apparatus by using a network or data broadcasting, and thereby, the illegitimate usage of the digital content is watched. A visible watermark is added to the digital content when illegitimately utilized, to restrain later usage. Even in regular usage, the route of copying or transferring the digital content can also be ascertained by adding an invisible watermark. Further, a public-key is put in a public-key distribution screen to be distributed by the network or broadcasting.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: January 30, 2001
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6174000
    Abstract: A threaded joint with trapezoidal threads for oil well pipes superior in sealing performance: having a load flank angle &thgr;1 of each thread satisfying desired conditions; having a shape of the thread such that opposite flanks of the trapezoidal thread come into contact with flanks of a corresponding thread simultaneously when the joint is so fastened as to give a threaded portion of the joint an interference &Dgr;d of not smaller than 0.12% and not larger than 0.8% of the outer diameter of a pipe to be jointed; having a gap formed between a crest and a bottom of this trapezoidal thread and set to be not larger than 0.2 mm; and having dimensional tolerances of thread width and thread height of the threads satisfying desired conditions.
    Type: Grant
    Filed: December 8, 1999
    Date of Patent: January 16, 2001
    Assignees: NKK Corporation, Mitsubishi Corporation
    Inventors: Masatsugu Nishi, Teruaki Suzuki
  • Patent number: 6141753
    Abstract: Techniques for secure distribution of digital representations that combine encryption and watermarking. When a user at a client desires to download a digital representation, the user makes a request to a server for the digital representation, which encrypts the digital representation using a first key and downloads the encrypted digital representation to the user. Before the user performs any operation on the decrypted digital representation, a secret fingerprint watermark identifying the user is added to the digital representation. The fingerprint watermark is added either at the server or at the client and a copy of the fingerprinted digital representation is kept at the server. If the user makes an impermissible use of the digital representation, the secret fingerprint watermark can be used to identify the user. The request made by the user indicates the type of use that the user wished to make of the digital representation.
    Type: Grant
    Filed: February 10, 1998
    Date of Patent: October 31, 2000
    Assignees: Fraunhofer Gesellschaft, Mitsubishi Corporation
    Inventors: Jian Zhao, Eckhard Koch, Makoto Saito
  • Patent number: 6135798
    Abstract: An automotive battery plug (1), once fitted in a cigar lighter socket (111), is retained therein with proper retentive force. When it is pulled out of the socket, the retentive force decreases, allowing ease in the removal of the plug (1). A slider (25, 31) slidable in a plug housing (2) has on its either side surface a support portion (25a) and an inclined portion (25b) forming a slope (26) contiguous to the support portion (25a). When a return end portion (17b) of each leaf-spring contact piece (17) abuts with the support portion (25a) of the slider (25), a contact portion (17a) of the contact piece (17) greatly protrudes from the periphery of the plug housing (2) through an opening (19), permitting the battery plug (1) to be fitted and held in the cigar lighter socket (111) with suitable retentive force.
    Type: Grant
    Filed: August 4, 1999
    Date of Patent: October 24, 2000
    Assignees: Mitsubishi Corporation, SMK Corporation
    Inventors: Hiroshi Saruta, Hiroshi Yokozawa
  • Patent number: 6126315
    Abstract: A liquid container having a stable shape that is easy to fill and that enables the user to pour out liquid to the last drop into an intended target using one hand only and without spilling the liquid. An internal space of a container is defined by a front surface portion, a rear surface portion having the shape identical with the front surface portion, and a pair of gussets each connecting together each confronting edges of the front and rear surface portions. The gusset has a folded arrangement. If liquid is filled in the container, V-shape of the gusset expands to provide a three dimensional container. The gussets extend to a neck portion. By the expansion of the gussets, a spout has a sufficient open area capable of controlled pouring of the liquid therethrough. If the liquid amount in the container is reduced, the spout is automatically closed when the container is self-standing on a table.
    Type: Grant
    Filed: July 23, 1998
    Date of Patent: October 3, 2000
    Assignees: Kabushiki Kaisha Hosokawa Yoko, Mitsubishi Corporation
    Inventors: Toru Ichikawa, Taiki Ishikawa, Raizo Kuge, Norikazu Shigeta
  • Patent number: 6128605
    Abstract: A data copyright management apparatus for handling data copyrights and data of digital cash, and for use in video conference systems is provided. The data copyright management apparatus is connected to a user terminal, and is used for performing decryption of encrypted digital data to be copied and edited, and also performing encryption of decrypted digital data to be stored, copied and transferred. The data copyright management apparatus may comprise one central processing unit so that either one of a microprosser of the user terminal and the microprocessor of the data copyright management apparatus performs decryption of the encrypted data and the other performs re-encryption of decrypted data at the same time. The data copyright management apparatus may also comprise two central processing units so that one central processing unit performs decryption of the encrypted data and the other central processing unit performs re-encryption of the decrypted data at the same time.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: October 3, 2000
    Assignee: Mitsubishi Corporation
    Inventors: Makoto Saito, Shunichi Momiki
  • Patent number: 6097816
    Abstract: A crypt key system for decrypting encrypted data for use, by a permit key including a decryption key, comprising a database/charging center, a broadcasting station, a receiving device and a communication device. The permit key is supplied to the broadcasting station in advance from the database/charging center. The permit key is broadcast from the broadcasting station. The receiving device receives the permit key via the broadcast. A request for use is executed to the database/charging center via the communication device. The database/charging center transmits the encrypted data via a communication line to the communication device and charges a fee. The communication device decrypts the encrypted data with the permit key received by the receiving device.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: August 1, 2000
    Assignee: Mitsubishi Corporation
    Inventors: Shunichi Momiki, Makoto Saito
  • Patent number: 6097818
    Abstract: The present invention provides a process for managing data copyright in the case when a primary user produces new data by editing a plurality of original data which have been supplied from data broadcasting, a recording medium or a database, and supplies the new data to a secondary user. A public-key and a private-key of the primary user, and a first secret-key and a second secret-key of the original data, each of which is controlled by a copyright management center, and an edit program are used. The primary user, who is supplied a plurality of original data encrypted by each first secret-key thereof, decrypts the plurality of original data by each of the secret-keys and produces new data using the edit program. The primary user re-encrypts the new data by the second secret-key of each original data, respectively. The re-encrypted data is supplied to the secondary-user, together with editing process data which includes a digital signature generated using the private-key.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: August 1, 2000
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6081794
    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: December 7, 1998
    Date of Patent: June 27, 2000
    Assignee: Mitsubishi Corporation
    Inventors: Makoto Saito, Shoichi Okazaki
  • Patent number: 6076077
    Abstract: A system for dealing in an original data content and an edited data content. A data content is handled as an object, and the data content is edited by editing a data content, functioning as an object, in accordance with an edit program. The edited data content is expressed by the original data content and the editing scenario which describes editing detail by the edit program. Only the encrypted editing scenario is dealt in. Upon receipt of the encrypted editing scenario, a user decrypts the encrypted editing scenario using a crypt key obtained from a key management center, and obtains the original data content from the database in accordance with the editing scenario and re-constitutes the edited data content. In case there is the one who wishes sale of the editing scenario, its utilization right is sold by auction.
    Type: Grant
    Filed: May 1, 1997
    Date of Patent: June 13, 2000
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 6071468
    Abstract: An apparatus and method of producing iron carbide of predetermined quality is disclosed. The method of producing iron carbide (Fe.sub.3 C) comprises reducing and carburizing an iron-containing raw material containing iron oxides (e.g., hematite) or iron hydroxides as main components, wherein the raw material is partially reduced to a reduction ratio of 50 to 65% by a gas containing mainly hydrogen in a first stage of the reaction process, then the partially reduced raw material is further reduced and carburized with a gas containing mainly hydrogen and methane in a second stage of the reaction process to provide iron carbide.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: June 6, 2000
    Assignees: Kawasaki Jukogyo Kabushiki Kaisha, Mitsubishi Corporation
    Inventors: Torakatsu Miyashita, Yoshio Uchiyama, Eiji Inoue, Junya Nakatani, Teruyuki Nakazawa, Satoru Iijima
  • Patent number: 6069952
    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: September 29, 1995
    Date of Patent: May 30, 2000
    Assignee: Mitsubishi Corporation
    Inventors: Makoto Saito, Shunichi Momiki
  • Patent number: 6002772
    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: Grant
    Filed: April 2, 1997
    Date of Patent: December 14, 1999
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 5974141
    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: Grant
    Filed: October 18, 1996
    Date of Patent: October 26, 1999
    Assignee: Mitsubishi Corporation
    Inventor: Makoto Saito
  • Patent number: 5945083
    Abstract: Powdered ore is fed into fluidized bed reactor 1 after preheating by hot blast in preheating furnace 2. Iron oxide particles are recovered from an exhaust gas of the preheating furnace 2 by dust catcher 3, and the iron oxide particles are reduced to iron in reducing furnace 4. The reduced iron particles are added into the flow path of fluidized bed reactor 1 to catalyze the reaction producing iron carbide.
    Type: Grant
    Filed: July 7, 1997
    Date of Patent: August 31, 1999
    Assignees: Kawasaki Jukogyo Kabushiki Kaisha, Mitsubishi Corporation
    Inventors: Eiji Inoue, Yoshio Uchiyama, Junya Nakatani