Patents by Inventor Takehiro Ookawa

Takehiro Ookawa 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).

  • Dual interface IC card
    Patent number: 6955300
    Abstract: For obtaining an IC card low in both power consumption and manufacturing cost, operating conditions in case of going through a contact point, which conditions are associated with supply voltage and signal level in an internal circuit, are to lie within operating conditions in case of going through an antenna. To this end, an IC chip of the IC card is provided with a voltage conversion circuit for lowering a supply voltage supplied through the contact point and a level conversion circuit for lowering the level of a signal fed from the contact point to the internal circuit and raising the level of a signal fed from the internal circuit to the contact point.
    Type: Grant
    Filed: August 20, 2003
    Date of Patent: October 18, 2005
    Assignee: Renesas Technology Corp.
    Inventors: Hiroshi Yoshigi, Takehiro Ookawa, Tadashi Oonishi, Kazuki Watanabe
  • Composite IC card
    Patent number: 6637664
    Abstract: For obtaining an IC card low in both power consumption and manufacturing cost, operating conditions in case of going through a contact point, which conditions are associated with supply voltage and signal level in an internal circuit, are to lie within operating conditions in case of going through an antenna. To this end, an IC chip of the IC card is provided with a voltage conversion circuit for lowering a supply voltage supplied through the contact point and a level conversion circuit for lowering the level of a signal fed from the contact point to the internal circuit and raising the level of a signal fed from the internal circuit to the contact point.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: October 28, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Yoshigi, Takehiro Ookawa, Tadashi Oonishi, Kazuki Watanabe
  • Composite IC card
    Patent number: 6585166
    Abstract: An IC card capable of preventing the occurrence of an abnormal state of coupling and thereby preventing malfunction of IC is provided. The IC card is provided with a coupling detecting means for detecting a contact coupling and a non-contact coupling and is also provided with a communication cut-off means which, when there are supplied electric power and a signal for inducing the other coupling during communication by one coupling, cuts off communication so that communication is performed by neither of the couplings.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: July 1, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Takehiro Ookawa, Hiroshi Yoshigi, Tadashi Oonishi, Kazuki Watanabe
  • IC card
    Patent number: 6173900
    Abstract: An object of the present invention is able to provide an IC card in which for example, even if a state should occur in which a plurality of IC cards are piled up in any direction for use, a received signal is not greatly lowered but a normal usage pattern is secured. When the IC cards are piled up with the contours united, a projection drawing of an antenna of one IC card to an antenna surface of the other IC card has an area not overlapped at least 15% or more of an area having an antenna to the other antenna surface on the projection surface and the IC card can work.
    Type: Grant
    Filed: October 27, 1999
    Date of Patent: January 16, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Yoshigi, Takehiro Ookawa, Ryouzou Yoshino, Kimiaki Andou, Tadashi Oonishi, Koji Tsuru, Shin Kanno, Shigeru Date, Hisanobu Dobashi, Masahiro Sugiura