Patents by Inventor Shigeo Matsuzawa
Shigeo Matsuzawa 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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Publication number: 20070195517Abstract: An object is to provide a showcase in which terminals of an illuminative lamp can electrically be connected to power supply portions of sockets securely and safely and in which an attaching operation of the illuminative lamp can be simplified; the showcase is provided with the sockets each including a main body side socket member which connect the illuminative lamp to a power source of a main body and an illuminative lamp side socket member; the main body side socket member includes a connecting section in which a power supply contact piece is stored; the illuminative lamp side socket member includes an attachment section to be attached to an end portion of the illuminative lamp, and a storage section; the terminal is opposed to the inside of the storage section in a state in which the attachment section is attached to the end portion of the illuminative lamp; and the terminal is electrically connected to the power supply contact piece, and the power supply contact piece is urged toward the terminal by a presType: ApplicationFiled: February 12, 2007Publication date: August 23, 2007Applicant: SANYO ELECTRIC CO., LTD.Inventors: Tetsuya Oketani, Shigeo Matsuzawa
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Publication number: 20070110054Abstract: The communication device includes a first transmitting unit that transmits to a server a first message transmitted according to a first protocol; a receiving unit that receives a port number message including a translated port number from the server via the network forwarding device; a first protocol processing unit that generates a second message that is to be transmitted according to the first protocol; a second protocol processing unit that generates a third message in which the first protocol is concealed by appending, to the generated second message, a header according to a second protocol; a third protocol processing unit that generates a fourth message in which the first protocol is concealed by appending, to the generated third message, a header according to a third protocol; and a second transmitting unit that transmits the generated fourth message to the server via the network forwarding device.Type: ApplicationFiled: November 1, 2006Publication date: May 17, 2007Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yasuyuki Kozakai, Shigeo Matsuzawa
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Patent number: 7206315Abstract: A router device and a cut-through path control method capable of carrying out the load balancing at an intermediate router device which actually has a multi-path information, without requiring a special processing at the edge router are disclosed. At a router device at which multi-path exists, one router among a plurality of routers that can possibly be a next hop router is selected so as to contribute to a load balancing, according to a whole or a prescribed part of information regarding a state of cut-through path set up in which the router device is involved, at a time of setting up a cut-through path in the multi-path, and a prescribed control for setting up the cut-through path with that one router as the next hop router is carried out.Type: GrantFiled: December 22, 2005Date of Patent: April 17, 2007Assignee: Kabushiki Kaisha ToshibaInventors: Shigeo Matsuzawa, Toru Konno, Akiyoshi Mogi
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Patent number: 7151758Abstract: A mobile supporting router device for realizing the handoff control associated with the moving in high speed is forms by at least one first interface connected with radio base stations, each capable of accommodating at least one mobile terminal; at least one second interface connected with a wire network; an information exchanging unit for exchanging a routing protocol on a network layer, through the second interface; a memory unit for storing information regarding a routing on the network layer based on the routing protocol exchanged by the information exchanging unit; a transfer unit for transferring datagram through the first interface according to the information regarding the routing on the network layer stored in the memory unit; a moving detection unit for detecting a moving of the mobile terminal among the radio base stations; and an information updating unit for updating the information regarding the routing on the network layer stored in the memory unit when the moving of the mobile terminal is deteType: GrantFiled: July 26, 2002Date of Patent: December 19, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Yoshinari Kumaki, Keiji Tsunoda, Shigeo Matsuzawa, Noriyasu Kato, Osamu Moriya, Toshio Okamoto
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Patent number: 7120145Abstract: A node device and a label switched path loop detection method which are capable of detecting a label switched path loop efficiently and quickly are disclosed. In a node device for carrying out the label switching, an ingress node information is included in a message that is to be successively transmitted from the upstream side in order to set up a label switched path, and the fact that the message with the same ingress node information for the same packet flow will be received from a previous hop node that is different from before if the label switched path has a loop formed thereon is utilized. Also, at a time of transmitting a message for the purpose of setting up a label switched path, if a node at which the label switched path for that packet flow already exists on the upstream or downstream side is encountered, this already existing label switched path is traced along the same or opposite direction as the flow, and the label switched path is set up if no loop is detected after tracing to the end.Type: GrantFiled: July 10, 2002Date of Patent: October 10, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Yoshihiro Ohba, Junichi Takahashi, Shigeo Matsuzawa, Yasuhiro Katsube
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Publication number: 20060109853Abstract: A router device and a cut-through path control method capable of carrying out the load balancing at an intermediate router device which actually has a multi-path information, without requiring a special processing at the edge router are disclosed. At a router device at which multi-path exists, one router among a plurality of routers that can possibly be a next hop router is selected so as to contribute to a load balancing, according to a whole or a prescribed part of information regarding a state of cut-through path set up in which the router device is involved, at a time of setting up a cut-through path in the multi-path, and a prescribed control for setting up the cut-through path with that one router as the next hop router is carried out.Type: ApplicationFiled: December 22, 2005Publication date: May 25, 2006Inventors: Shigeo Matsuzawa, Toru Konno, Akiyoshi Mogi
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Patent number: 7009987Abstract: A router device and a cut-through path control method capable of carrying out the load balancing at an intermediate router device which actually has a multi-path information, without requiring a special processing at the edge router are disclosed. At a router device at which multi-path exists, one router among a plurality of routers that can possibly be a next hop router is selected so as to contribute to a load balancing, according to a whole or a prescribed part of information regarding a state of cut-through path set up in which the router device is involved, at a time of setting up a cut-through path in the multi-path, and a prescribed control for setting up the cut-through path with that one router as the next hop router is carried out.Type: GrantFiled: October 29, 1999Date of Patent: March 7, 2006Assignee: Kabushiki Kaisha ToshibaInventors: Shigeo Matsuzawa, Toru Konno, Akiyoshi Mogi
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Publication number: 20050235152Abstract: In the encryption key sharing scheme, the eavesdropping of the communication contents by the third person is prevented by automatically updating a shared key which is hard to predict for the third person, by acquiring a seed of the shared key to be used for the encryption of the next communication from the correspondent, without requiring the user to update the shared key at every occasion of the communication with the correspondent.Type: ApplicationFiled: March 14, 2005Publication date: October 20, 2005Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Satoshi Ozaki, Seijiro Yoneyama, Shigeo Matsuzawa
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Patent number: 6907040Abstract: A router has a function of providing a label used for transferring a datalink frame by a cut-through operation (i.e., datalink-layer switching). Whether the cut-through operation is to be performed or not is indicated by a cut-through declarator described in a prescribed portion (e.g., OUI field) within an upper-layer-protocol identifying information region (e.g., SNAP field) of a received frame or signaling message. The information described in the remaining portion (e.g., PID field) within the upper-layer-protocol identifying information region and the information described in the destination or source datalink-layer address region of the received frame or signaling message are used as the label for identifying in the datalink layer a packet flow to which a received frame belongs.Type: GrantFiled: October 15, 2002Date of Patent: June 14, 2005Assignee: Kabushiki Kaisha ToshibaInventor: Shigeo Matsuzawa
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Publication number: 20040071135Abstract: A set-up scheme for a cut-through connection in a network system capable of realizing a high throughput, low latency internetwork communication efficiently under an internet environment. A network node checks source/destination information of the transport layer and/or a source/destination information of the network layer of a received packet, and if the checked information satisfies a prescribed condition, determines the packet to be a trigger. Then, the network node instructs another node capable of initiating a set-up operation, which may be the network node itself, to initiate the set-up of the cut-through connection for traffic corresponding to the trigger packet.Type: ApplicationFiled: July 10, 2003Publication date: April 15, 2004Applicant: Kabushiki Kaisha ToshibaInventors: Tatsuya Jimmei, Shigeo Matsuzawa
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Patent number: 6614795Abstract: A set-up scheme for a cut-through connection in a network system capable of realizing a high throughput, low latency internetwork communication efficiently under an internet environment. A network node checks source/destination information of the transport layer and/or a source/destination information of the network layer of a received packet, and if the checked information satisfies a prescribed condition, determines the packet to be a trigger. Then, the network node instructs another node capable of initiating a set-up operation, which may be the network node itself, to initiate the set-up of the cut-through connection for traffic corresponding to the trigger packet.Type: GrantFiled: December 16, 1996Date of Patent: September 2, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Tatsuya Jimmei, Shigeo Matsuzawa
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Publication number: 20030067929Abstract: A router has a function of providing a label used for transferring a datalink frame by a cut-through operation (i.e., datalink-layer switching). Whether the cut-through operation is to be performed or not is indicated by a cut-through declarator described in a prescribed portion (e.g., OUI field) within an upper-layer-protocol identifying information region (e.g., SNAP field) of a received frame or signaling message. The information described in the remaining portion (e.g., PID field) within the upper-layer-protocol identifying information region and the information described in the destination or source datalink-layer address region of the received frame or signaling message are used as the label for identifying in the datalink layer a packet flow to which a received frame belongs.Type: ApplicationFiled: October 15, 2002Publication date: April 10, 2003Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Shigeo Matsuzawa
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Patent number: 6501754Abstract: A node device and a label switched path loop detection method which are capable of detecting a label switched path loop efficiently and quickly are disclosed. In a node device for carrying out the label switching, an ingress node information is included in a message that is to be successively transmitted from the upstream side in order to set up a label switched path, and the fact that the message with the same ingress node information for the same packet flow will be received from a previous hop node that is different from before if the label switched path has a loop formed thereon is utilized. Also, at a time of transmitting a message for the purpose of setting up a label switched path, if a node at which the label switched path for that packet flow already exists on the upstream or downstream side is encountered, this already existing label switched path is traced along the same or opposite direction as the flow, and the label switched path is set up if no loop is detected after tracing to the end.Type: GrantFiled: August 7, 1998Date of Patent: December 31, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Yoshihiro Ohba, Junichi Takahashi, Shigeo Matsuzawa, Yasuhiro Katsube
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Publication number: 20020191562Abstract: A mobile supporting router device for realizing the handoff control associated with the moving in high speed is forms by at least one first interface connected with radio base stations, each capable of accommodating at least one mobile terminal; at least one second interface connected with a wire network; an information exchanging unit for exchanging a routing protocol on a network layer, through the second interface; a memory unit for storing information regarding a routing on the network layer based on the routing protocol exchanged by the information exchanging unit; a transfer unit for transferring datagram through the first interface according to the information regarding the routing on the network layer stored in the memory unit; a moving detection unit for detecting a moving of the mobile terminal among the radio base stations; and an information updating unit for updating the information regarding the routing on the network layer stored in the memory unit when the moving of the mobile terminal is deteType: ApplicationFiled: July 26, 2002Publication date: December 19, 2002Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yoshinari Kumaki, Keiji Tsunoda, Shigeo Matsuzawa, Noriyasu Kato, Osamu Moriya, Toshio Okamoto
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Patent number: 6490622Abstract: A scheme for sharing a common virtual connection identifier between end-nodes, which enable sharing of a common identifier of a sufficient information length at both end-nodes of a virtual connection. In this scheme, the first message containing a first identifier for provisionally identifying a virtual connection commonly between neighboring nodes is exchanged between neighboring nodes, at a time of setting up the virtual connection. Then, the second message containing a second identifier having a larger information size than the first identifier for formally identifying the virtual connection commonly between neighboring nodes, in a form that enables establishing of a correspondence between the first identifier and the second identifier, is exchanged between neighboring nodes through another virtual connection different from the virtual connection to be set up.Type: GrantFiled: March 11, 1998Date of Patent: December 3, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Kenichi Nagami, Yasuhiro Katsube, Shigeo Matsuzawa
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Patent number: 6490292Abstract: A router has a function of providing a label used for transferring a datalink frame by a cut-through operation (i.e., datalink-layer switching). Whether the cut-through operation is to be performed or not is indicated by a cut-through declarator described in a prescribed portion (e.g., OUI field) within an upper-layer-protocol identifying information region (e.g., SNAP field) of a received frame or signaling message. The information described in the remaining portion (e.g., PID field) within the upper-layer-protocol identifying information region and the information described in the destination or source datalink-layer address region of the received frame or signaling message are used as the label for identifying in the datalink layer a packet flow to which a received frame belongs.Type: GrantFiled: March 15, 1999Date of Patent: December 3, 2002Assignee: Kabushiki Kaisha ToshibaInventor: Shigeo Matsuzawa
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Publication number: 20020176370Abstract: A node device and a label switched path loop detection method which are capable of detecting a label switched path loop efficiently and quickly are disclosed. In a node device for carrying out the label switching, an ingress node information is included in a message that is to be successively transmitted from the upstream side in order to set up a label switched path, and the fact that the message with the same ingress node information for the same packet flow will be received from a previous hop node that is different from before if the label switched path has a loop formed thereon is utilized. Also, at a time of transmitting a message for the purpose of setting up a label switched path, if a node at which the label switched path for that packet flow already exists on the upstream or downstream side is encountered, this already existing label switched path is traced along the same or opposite direction as the flow, and the label switched path is set up if no loop is detected after tracing to the end.Type: ApplicationFiled: July 10, 2002Publication date: November 28, 2002Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yoshihiro Ohba, Junichi Takahashi, Shigeo Matsuzawa, Yasuhiro Katsube
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Patent number: 6480468Abstract: The present invention aims at making the cut-through trigger variable in accordance with the traffic environment, thereby increasing the cut-through traffic to enhance the efficiency of communication. In the trigger filtering unit (16A), the number of transfers of the hop-by-hop packet meeting each of a plurality of preset trigger conditions is counted. In the processor (15A), the rate of the traffic meeting each of trigger conditions to all the traffics of the hop-by-hop transfer is calculated in accordance with the count value, a trigger condition under which the rate exceeds the threshold value is selected as the cut-through trigger, and it is determined which of the cut-through transfer mode and the hop-by-hop transfer mode should be selected.Type: GrantFiled: May 14, 1999Date of Patent: November 12, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Tohru Kishigami, Kazuo Nogami, Shigeo Matsuzawa, Kenichi Nagami
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Patent number: 6473411Abstract: A mobile supporting router device for realizing the handoff control associated with the moving in high speed is forms by at least one first interface connected with radio base stations, each capable of accommodating at least one mobile terminal; at least one second interface connected with a wire network; an information exchanging unit for exchanging a routing protocol on a network layer, through the second interface; a memory unit for storing information regarding a routing on the network layer based on the routing protocol exchanged by the information exchanging unit; a transfer unit for transferring datagram through the first interface according to the information regarding the routing on the network layer stored in the memory unit; a moving detection unit for detecting a moving of the mobile terminal among the radio base stations; and an information updating unit for updating the information regarding the routing on the network layer stored in the memory unit when the moving of the mobile terminal is deteType: GrantFiled: May 12, 1998Date of Patent: October 29, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Yoshinari Kumaki, Keiji Tsunoda, Shigeo Matsuzawa, Noriyasu Kato, Osamu Moriya, Toshio Okamoto
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Patent number: 6389023Abstract: A router device and a frame transfer method capable of attaching a virtual identifier necessary for the datalink layer switching that improves a transfer efficiency at the router device.Type: GrantFiled: April 7, 1998Date of Patent: May 14, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Shigeo Matsuzawa, Yasuhiro Katsube