Patents by Inventor Masakazu Shirakawa
Masakazu Shirakawa 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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Patent number: 8126463Abstract: A mobile communication system that is possible to shorten time from a handover request to a handover completion and to perform a high-speed handover is described. The mobile communication system includes a plurality of base stations which is configured to make wireless communication with a mobile terminal through, and a base station control apparatus connected to the base stations. The base station control apparatus includes a handover control section determines a handover base station to be handed over by the mobile terminal from the base stations, and directs the mobile terminal to hand over to the handover base station.Type: GrantFiled: August 28, 2008Date of Patent: February 28, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Keiji Yamamoto, Masakazu Shirakawa, Kazuya Negishi
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Publication number: 20100274536Abstract: According to one embodiment, a layout design support system has a layout editing unit which edits equipment arrangement data, equipment connection element data and the other data, and depicts the edited data, and a storage unit which storage such data. The storage unit stores equipment arrangement data that includes not only equipment specification data, and arrangement coordinate data and size data of each equipment, but also piece number of each piece configuring the equipment, and stores equipment connection element data that includes connection name, equipment name of upstream and downstream connection destination equipments, piece number and port of the equipments. The layout editing unit edits the equipment arrangement data or equipment connection element data at the level of the piece in accordance with an accepted edit instruction.Type: ApplicationFiled: April 26, 2010Publication date: October 28, 2010Inventors: Yuuki OKADA, Masakazu Shirakawa
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Publication number: 20090069015Abstract: A mobile communication system that is possible to shorten time from a handover request to a handover completion and to perform a high-speed handover is described. The mobile communication system includes a plurality of base stations which is configured to make wireless communication with a mobile terminal through, and a base station control apparatus connected to the base stations. The base station control apparatus includes a handover control section determines a handover base station to be handed over by the mobile terminal from the base stations, and directs the mobile terminal to hand over to the handover base station.Type: ApplicationFiled: August 28, 2008Publication date: March 12, 2009Applicant: Kabushiki Kaisha ToshibaInventors: Keiji YAMAMOTO, Masakazu Shirakawa, Kazuya Negishi
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Patent number: 6399879Abstract: An electromagnetic shield plate comprising a geometric pattern having a line width of 10 &mgr;m to 80 &mgr;m and a line interval of 50 to 250 mesh on a surface of a transparent substrate, provides good visibility and excellent electromagnetic shielding, and is easy to manufacture and permits the fabrication of a large-size plate in a simple manner.Type: GrantFiled: October 27, 1999Date of Patent: June 4, 2002Assignee: Sumitomo Chemical Company, LimitedInventors: Kayoko Ueda, Hajime Kuwahara, Toshiya Inoue, Masakazu Shirakawa
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Publication number: 20010045178Abstract: A pigment dispersion which comprises a pigment, a dispersant, a non-aqueous medium and a binder resin, wherein the amount of the binder resin is 10 to 60% by weight based on the amount of the pigment, and exhibits excellent dispersion stability in terms of viscosity, thixotropic property; and a photosensitive coloring composition comprising the pigment dispersion and used for manufacturing a colored pixel are provided.Type: ApplicationFiled: April 13, 2001Publication date: November 29, 2001Inventors: Masakazu Shirakawa, Koji Baba, Toshiya Inoue
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Patent number: 5978667Abstract: An electronic exchange system comprises an electronic exchange system for private branch exchanging, multifunctional telephone sets operating as wired extension terminals, public network main lines of a public telecommunication network that are cores for connecting the central telephone electronic exchange system and said electronic exchange system, leased or private lines, cell stations, a control terminal and portable stations of radio slave units for the cell stations. If an incoming call is not forwarded to the called portable station because the portable station does not respond, the incoming call is stored in a predetermined memory arranged with the electronic exchange system, which connects the portable station and the calling terminal once the portable station restores it communicable state.Type: GrantFiled: September 19, 1995Date of Patent: November 2, 1999Assignee: Kabushiki Kaisha ToshibaInventors: Hirokazu Suzuki, Masakazu Shirakawa, Motohiro Nakano, Emi Ito
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Patent number: 5446739Abstract: Portable stations with a single receiver can perform communication using a plurality of slots in one frame in time division multiple access (TDMA) transmission. When communication is performed between one of the portable stations and a cell station with data of two 32 kbps data into which an exchange converts one 64 kbps data, the portable station occupies two slots in one TDMA frame. A controller of the cell station assigns these two slots as being separated from each other by at least one slot. Alternatively, the controller assigns these two slots as being adjacent to each other and assigns same carrier frequency to these slots. Thus, communication with a transmission rate of 63 kbps can be performed by using two slots or two channels of 32 kbps.Type: GrantFiled: January 4, 1994Date of Patent: August 29, 1995Assignee: Kabushiki Kaisha ToshibaInventors: Motohiro Nakano, Masakazu Shirakawa
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Patent number: 5383221Abstract: In a mobile radio system including at least one mobile station unit and a plurality of base station units, the mobile station unit communicates with a base station through time-division multiplexed control and communication channels. The mobile station unit includes a line quality detecting section for detecting the deterioration of the line quality occurring during communication, and a control section for controlling the entire unit.Type: GrantFiled: February 27, 1992Date of Patent: January 17, 1995Assignee: Kabushiki Kaisha ToshibaInventors: Yoshihiro Akita, Masakazu Shirakawa
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Patent number: 4888728Abstract: According to a multipoint link data-transmission control system, a master transmission device delivers message data via a bidirectional transmission path to a plurality of slave transmission devices, the data containing a control field for designating control data for setting or resetting a flag. The transmitting of data from the slave transmission device to the master transmission device is allowed when the flag is set, and is inhibited when the flat is reset. Where the transmitting of data from a faulty slave transmission device is to be inhibited, the master transmission device transmits the data to the faculty slave transmission device, by designating flag reset data to the control field of the message data. As a result, a transmission-enable signal, which is delivered in synchronization with a transmission-timing clock signal, is reset, thereby stopping the transmitting of data from the slave transmission device to the master transmission device.Type: GrantFiled: March 30, 1987Date of Patent: December 19, 1989Assignee: Kabushiki Kaisha ToshibaInventors: Masakazu Shirakawa, Hiroaki Yamashita, Toshio Nishida
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Patent number: 4885765Abstract: A main apparatus transmits auxiliary information, which is concerned with telephone communications and includes at least an information attribute and an information entity. A telephone terminal apparatus is coupled to the main apparatus by a local telephone line, and has components for controlling the auxiliary information supplied from the main apparatus on the basis of the operation auxiliary information. The components are able to register a predetermined mode corresponding to the auxiliary information in the telephone terminal apparatus.Type: GrantFiled: October 14, 1987Date of Patent: December 5, 1989Assignee: Kabushiki Kaisha ToshibaInventor: Masakazu Shirakawa
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Patent number: 4736409Abstract: A private branch exchange includes a common control module and a plurality of line/trunk modules. A plurality of line/trunk cards are contained in a respective line/trunk module and terminals of the same type, such as digital telephones or standard telephones, are connected to the respective cards. For control data transmission, the line/trunk cards of each of the line/trunk modules are coupled to the common control module via a common control data highway. Each line/trunk card includes, for terminal control, a central processor unit (CPU) and random access memory (RAM) for storing a control program in accordance with the type of terminals. To the line/trunk card is allocated an individual address and group address representing a group of line/trunk cards to which are connected terminals of the same type.Type: GrantFiled: September 2, 1986Date of Patent: April 5, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Hiroyuki Hasegawa, Makoto Osada, Masakazu Shirakawa
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Patent number: 4733390Abstract: A data transmission system in which a plurality of data transmitting circuits with different addresses allotted thereto and a common data receiving circuit are coupled to one another through common data transmission lines. A clock pulse signal determining the rate of data transmission and a frame sync signal determining one frame period having a plurality of time slots are transmitted to the common data transmission lines. The plurality of data transmission circuits are each given a right to transmit data in a plurality of time slots according to a predetermined priority. Each data transmitting circuit is allowed to transmit data in time slots other than a time slot in which a first priority is assigned to itself, after confirming that no data is being transmitted to the common data transmission line by other data transmitting circuits with a priority higher than its priority.Type: GrantFiled: September 8, 1986Date of Patent: March 22, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Masakazu Shirakawa, Hiroyuki Hasegawa