Patents by Inventor Yoshihiro Ohba

Yoshihiro Ohba 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).

  • Publication number: 20050163079
    Abstract: Systems and methods are described for secure and seamless roaming between internal and external networks. Double and triple tunnels may be used to connect a mobile node to a correspondent host. A mobile node may include the ability to connect to two networks simultaneously to enable seamless roaming between networks.
    Type: Application
    Filed: July 21, 2004
    Publication date: July 28, 2005
    Applicants: Toshiba America Research Inc. (TARI), Telcordial Technologies, Inc.
    Inventors: Kenichi Taniuchi, Tao Zhang, Prathima Agrawal, Ashutosh Dutta, Shinichi Baba, Kensaku Fujimoto, Yasuhiro Katsube, Toshikazu Kodama, Yoshihiro Ohba, Sunil Madhani
  • Publication number: 20050059730
    Abstract: The present invention relates to a thiophene-containing compound and a thiophene-containing compound polymer which are useful for organo-electronic devices such as electrophotographic photoreceptors (photosensitive elements), organic electroluminescent elements and organic transistors. More specifically, the invention relates to a thiophene-containing compound and a thiophene-containing compound polymer which are excellent in terms of both charge-transporting properties and luminous properties.
    Type: Application
    Filed: February 20, 2004
    Publication date: March 17, 2005
    Inventors: Yoshihiro Ohba, Kazuaki Sato, Mieko Seki, Takeshi Agata, Katsuhiro Sato, Kiyokazu Mashimo, Hirohito Yoneyama, Hidekazu Hirose
  • Publication number: 20040098588
    Abstract: A system and method are provided for establishing a network communication session using fast authentication. In a network system a client or user device may establish a communication session with a server using full authentication. If the session is interrupted or discontinued and resumption of the session is requested, a session identifier of the previously established session may be compared to the session identifier of the requested session. If a match is detected, the session may be resumed using a fast authentication (or re-authentication) procedure such that the session is resumed more efficiently and expediently. Fast authentication may be performed, for example, even when the first session and the resumed second session are of different authentication layers, different types of network interfaces and/or different locations. Thus, a session, such as a TLS session, may resume functionality among multiple defined authentication protocols or technologies such as 802.1X, PANA or cellular based systems.
    Type: Application
    Filed: July 1, 2003
    Publication date: May 20, 2004
    Applicants: Toshiba America Research, Inc., Telcordia Technologies, Inc.
    Inventors: Yoshihiro Ohba, Yasuhiro Katsube, Shinichi Baba, Anthony McAuley, Subir Das
  • Patent number: 6609316
    Abstract: A packet transfer scheme that applies markings at different levels to packets while they are transferred from their source to destination, in which a marking information at one level will not be lost by a marking at another level is disclosed. A node device receives packets each having a plurality of regions into which priority information can be written, and then transmits each received packet to a next hop node by writing the priority information according to criteria of the own node into one region into which the own node is allowed to write the priority information among the plurality of regions contained in each packet, while maintaining the priority information in other regions as received.
    Type: Grant
    Filed: September 3, 2002
    Date of Patent: August 26, 2003
    Inventors: Yoshihiro Ohba, Yoshimitsu Shimojo
  • Publication number: 20030142681
    Abstract: A method for distributing and conditioning IP traffic for mobile networks based on differentiated services, wherein edge/border routers are only required to maintain QoS profiles for related mobile stations. A new IP address or a new service level subscription or service level agreement of an mobile station is only sent to related edge/border routers. As a result, unnecessary IP traffic is significantly reduced. The routers in accordance with methods of the invention disregard the contents of an IP payload and therefore all of the IP addresses that a mobile station may posse. A mobile station is permitted to enter into a domain and obtain a desired quality of service (e.g., Gold or Standard service) without the need to maintain the service while moving through the domain.
    Type: Application
    Filed: January 31, 2002
    Publication date: July 31, 2003
    Inventors: Jyh Cheng Chen, Anthony McAuley, Shinichi Baba, Yoshihiro Ohba
  • Publication number: 20030045270
    Abstract: A system and method are provided by which a network operator is able to detect fraudulent use of a subscriber's terminal, regardless of whether or not the subscriber is aware of the fraudulent use of her terminal. Detecting unauthorized terminal use in a wireless network includes recording a history of terminal location and registration patterns, analyzing the recorded history of location and registration patterns of the terminal, monitoring current location and registration patterns of the terminal, and requesting clarification when a deviation between said statistical analysis of the location and registration patterns of said terminal and said current location and registration patterns of said terminal is detected.
    Type: Application
    Filed: September 6, 2001
    Publication date: March 6, 2003
    Inventors: Prathima Agrawal, Nobuyasu Nakjima, Yoshihiro Ohba, Faramak Vakil
  • Publication number: 20030002511
    Abstract: A packet transfer scheme that applies markings at different levels to packets while they are transferred from their source to destination, in which a marking information at one level will not be lost by a marking at another level is disclosed. A node device receives packets each having a plurality of regions into which priority information can be written, and then transmits each received packet to a next hop node by writing the priority information according to criteria of the own node into one region into which the own node is allowed to write the priority information among the plurality of regions contained in each packet, while maintaining the priority information in other regions as received.
    Type: Application
    Filed: September 3, 2002
    Publication date: January 2, 2003
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshihiro Ohba, Yoshimitsu Shimojo
  • Patent number: 6501760
    Abstract: A packet transfer scheme that applies markings at different levels to packets while they are transferred from their source to destination, in which a marking information at one level will not be lost by a marking at another level is disclosed. A node device receives packets each having a plurality of regions into which priority information can be written, and then transmits each received packet to a next hop node by writing the priority information according to criteria of the own node into one region into which the own node is allowed to write the priority information among the plurality of regions contained in each packet, while maintaining the priority information in other regions as received.
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: December 31, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshihiro Ohba, Yoshimitsu Shimojo
  • Patent number: 6501754
    Abstract: 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: Grant
    Filed: August 7, 1998
    Date of Patent: December 31, 2002
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshihiro Ohba, Junichi Takahashi, Shigeo Matsuzawa, Yasuhiro Katsube
  • Publication number: 20020176370
    Abstract: 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: Application
    Filed: July 10, 2002
    Publication date: November 28, 2002
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshihiro Ohba, Junichi Takahashi, Shigeo Matsuzawa, Yasuhiro Katsube
  • Patent number: 6101193
    Abstract: A packet scheduling scheme which is capable of improving the fairness characteristic in a short time scale by suppressing the burstiness of traffic compared with the conventional weight fair queueing algorithm such as DRR. Packets are held in a plurality of packet queues by inputting arrived packets into the packet queues. Then, an output packet queue is sequentially selected from the packet queues, according to a prescribed criterion based on an amount of packets currently transmittable by each packet queue, such that the output packet queue is selected to be different from a previously selected output packet queue when there are more than one packet queues that satisfy the prescribed criterion. Then, a top packet is outputted from the sequentially selected output packet queue.
    Type: Grant
    Filed: September 10, 1997
    Date of Patent: August 8, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshihiro Ohba