Patents by Inventor Takefumi Isaka

Takefumi Isaka 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).

  • Interface circuit which meets universal serial bus standard and performs host and device functions
    Patent number: 6907492
    Abstract: When a device such as a printer is connected to a connector 49 via a USB cable using an electronic device 40 as a host, a selecting circuit 43b is switched to a host function circuit 43a by operating a switch 42. When a host such as a personal computer is connected to the connector 49 via the USB cable using the electronic device 40 as device, the selecting circuit 43b is switched to a device function circuit 44a by operating the switch 42. A USB interface is controlled according to output of a microcomputer 41. Therefore, an interface circuit which meets USB standards, facilitates switching between a host function and a device function, has a simple circuit configuration and allows small-sizing can be provided.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: June 14, 2005
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Chikara Matsuda, Takefumi Isaka
  • Interface circuit
    Publication number: 20030023804
    Abstract: When a device such as a printer is connected to a connector 49 via a USB cable using an electronic device 40 as a host, a selecting circuit 43b is switched to a host function circuit 43a by operating a switch 42. When a host such as a personal computer is connected to the connector 49 via the USB cable using the electronic device 40 as device, the selecting circuit 43b is switched to a device function circuit 44a by operating the switch 42. A USB interface is controlled according to output of a microcomputer 41. Therefore, an interface circuit which meets USB standards, facilitates switching between a host function and a device function, has a simple circuit configuration and allows small-sizing can be provided.
    Type: Application
    Filed: March 28, 2002
    Publication date: January 30, 2003
    Inventors: Chikara Matsuda, Takefumi Isaka