Patents by Inventor Kei Yanagisawa

Kei Yanagisawa 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).

  • Patent number: 9049726
    Abstract: A network management unit included in a base station of WRAN, and a heterogeneous-systems coexistence function unit included in a relay station perform communications by taking advantage of the wireless line of WRAN. In this way, the network management unit and the heterogeneous-systems coexistence function unit make the determination and management of a frequency channel to be utilized by WLAN. Concretely, the QP (Quiet Period) of WRAN and that of WLAN are synchronized with each other with respect to the above-described frequency channel. During the synchronized QPs, WRAN and WLAN make the absence confirmation of a primary user.
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: June 2, 2015
    Assignee: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Keigo Hasegawa, Masayuki Takekawa, Keat Beng Toh, Kei Yanagisawa
  • Publication number: 20130235771
    Abstract: A network management unit included in a base station of WRAN, and a heterogeneous-systems coexistence function unit included in a relay station perform communications by taking advantage of the wireless line of WRAN. In this way, the network management unit and the heterogeneous-systems coexistence function unit make the determination and management of a frequency channel to be utilized by WLAN. Concretely, the QP (Quiet Period) of WRAN and that of WLAN are synchronized with each other with respect to the above-described frequency channel. During the synchronized QPs, WRAN and WLAN make the absence confirmation of a primary user.
    Type: Application
    Filed: February 14, 2013
    Publication date: September 12, 2013
    Applicant: HITACHI KOKUSAI ELECTRIC INC.
    Inventors: Keigo HASEGAWA, Masayuki TAKEKAWA, Keat Beng TOH, Kei YANAGISAWA
  • Patent number: 6860759
    Abstract: A housing (20) of a connector has a front end that can be introduced through a mount hole (H) in a panel (P). A detector (50) is mounted on the front end of the housing (20) is movable between a standby position and a detecting position. Movement of the detector (50) toward the detecting position is prevented by interference with the inner peripheral surface of the mount hole (H) while the housing (20) is being mounted on the panel (P). However, the inner peripheral surface of the mount hole (H) when the male housing (20) is mounted properly on the panel (P). Thus, the detector (50) can be moved to the detecting position.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: March 1, 2005
    Assignee: Sumitomo Wiring Systems, Ltd.
    Inventors: Hideto Nakamura, Kei Yanagisawa
  • Patent number: 6679720
    Abstract: A connector includes male and female connector housings (10, 20). The male housing (10) has a receptacle (11) and a lock arm (15) projects into the receptacle (11) for locking the female housing (20). A slider (34) is assembled into the female housing (20) and is biased forwardly by coil springs (33). The lock arm (15) is resiliently deformable between an engaging position where it is engageable with the slider (34) and a disengaging position where it is disengaged from the slider (34). If a connecting or separating operation is interrupted halfway, spring forces accumulated in the compression coil springs (33) resiliently compressed by the slider (34) are released. Thus, the lock arm (15) is pushed forward by the slider (34) to separate the housings (10, 20) from each other.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: January 20, 2004
    Assignee: Sumitomo Wiring Systems, Ltd.
    Inventors: Hideto Nakamura, Kei Yanagisawa
  • Patent number: 6659785
    Abstract: A connector has first and second housings (10, 30). The first housing (10) has male terminal fittings (13) and a shorting terminal (15) that is biased into shorting contact against the male terminal fittings (13). A pushing portion (36) displaces receiving pieces (20) of the shorting terminal (15) toward a bottom wall (12W) during connection of two housings (10, 20). The bottom wall (12W) has an escaping portion (22) for avoiding an interference with the receiving pieces (20). The receiving pieces (20) are displaced toward the bottom wall (12W) by the pushing portion (36) and enter the escaping portion (22). Thus the shorting terminal 15 is deformed to a large degree.
    Type: Grant
    Filed: April 9, 2002
    Date of Patent: December 9, 2003
    Assignee: Sumitomo Wiring Systems, Ltd.
    Inventors: Hideto Nakamura, Kei Yanagisawa
  • Publication number: 20030114044
    Abstract: A housing (20) of a connector has a front end that can be introduced through a mount hole (H) in a panel (P). A detector (50) is mounted on the front end of the housing (20) is movable between a standby position and a detecting position. Movement of the detector (50) toward the detecting position is prevented by interference with the inner peripheral surface of the mount hole (H) while the housing (20) is being mounted on the panel (P). However, the inner peripheral surface of the mount hole (H) when the male housing (20) is mounted properly on the panel (P). Thus, the detector (50) can be moved to the detecting position.
    Type: Application
    Filed: December 16, 2002
    Publication date: June 19, 2003
    Applicant: Sumitomo Wiring Systems, Ltd.
    Inventors: Hideto Nakamura, Kei Yanagisawa
  • Patent number: 6520786
    Abstract: A connector includes first and second housings (10, 30). During connection of the housings (10, 20), a slanted surface (38) of a pushing portion (37) comes into contact with receiving pieces (20) of a shorting terminal (15), which in turn is deformed resiliently by the inclination of the pushing portion (37) and moves away from male terminal fittings (13) to cancel a shorted state of the male terminal fittings (13). The pushing portions (37) are hard to deform and are provided with slanted surface (38) for resiliently deforming the shorting terminal (15). Therefore, the pushing portions (37) can deform the shorting terminal (15) without losing its guiding function even if the pushing portion (37) and the shorting terminal (15) get caught with each other at their contact portions.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: February 18, 2003
    Assignee: Sumitomo Wiring Systems, Ltd.
    Inventors: Hideto Nakamura, Kei Yanagisawa
  • Publication number: 20030022542
    Abstract: A connector has first and second housings (10, 30). The first housing (10) has male terminal fittings (13) and a shorting terminal (15) that is biased into shorting contact against the male terminal fittings (13). A pushing portion (36) displaces receiving pieces (20) of the shorting terminal (15) toward a bottom wall (12W) during connection of two housings (10, 20). The bottom wall (12W) has an escaping portion (22) for avoiding an interference with the receiving pieces (20). The receiving pieces (20) are displaced toward the bottom wall (12W) by the pushing portion (36) and enter the escaping portion (22). Thus the shorting terminal 15 is deformed to a large degree.
    Type: Application
    Filed: April 9, 2002
    Publication date: January 30, 2003
    Applicant: Sumitomo Wiring Systems, Ltd.
    Inventors: Hideto Nakamura, Kei Yanagisawa
  • Publication number: 20020115323
    Abstract: A connector includes male and female connector housings (10, 20). The male housing (10) has a receptacle (11) and a lock arm (15) projects into the receptacle (11) for locking the female housing (20). A slider (34) is assembled into the female housing (20) and is biased forwardly by coil springs (33). The lock arm (15) is resiliently deformable between an engaging position where it is engageable with the slider (34) and a disengaging position where it is disengaged from the slider (34). If a connecting or separating operation is interrupted halfway, spring forces accumulated in the compression coil springs (33) resiliently compressed by the slider (34) are released. Thus, the lock arm (15) is pushed forward by the slider (34) to separate the housings (10, 20) from each other.
    Type: Application
    Filed: February 12, 2002
    Publication date: August 22, 2002
    Applicant: Sumitomo Wiring Systems, Ltd.
    Inventors: Hideto Nakamura, Kei Yanagisawa
  • Publication number: 20020115322
    Abstract: A connector includes first and second housings (10, 30). During connection of the housings (10, 20), a slanted surface (38) of a pushing portion (37) comes into contact with receiving pieces (20) of a shorting terminal (15), which in turn is deformed resiliently by the inclination of the pushing portion (37) and moves away from male terminal fittings (13) to cancel a shorted state of the male terminal fittings (13). The pushing portions (37) are hard to deform and are provided with slanted surface (38) for resiliently deforming the shorting terminal (15). Therefore, the pushing portions (37) can deform the shorting terminal (15) without losing its guiding function even if the pushing portion (37) and the shorting terminal (15) get caught with each other at their contact portions.
    Type: Application
    Filed: January 18, 2002
    Publication date: August 22, 2002
    Applicant: Sumitomo Wiring Systems, Ltd.
    Inventors: Hideto Nakamura, Kei Yanagisawa