Patents by Inventor Takeo Anzai

Takeo Anzai 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).

  • Line switching equipment for switching a personal line to a backup ISDN line
    Patent number: 5210740
    Abstract: A terminal adapter portion sends and receives data of a data processing unit such as a data terminal device and information of a control portion through an ISDN line. The control portion responds to an externally supplied switching instruction to send switching instruction information to another line switching equipment or receive the information therefrom, through the ISDN line and to control a switching portion. The switching portion switches the data terminal device to either a personal line or the ISDN line depending upon the switching instruction. With this construction, it is possible to perform line switching control of two mutually opposing line switching equipments from either of them.
    Type: Grant
    Filed: June 21, 1991
    Date of Patent: May 11, 1993
    Assignee: NEC Corporation
    Inventors: Takeo Anzai, Shigeyuki Mitani, Tomohiro Kuroda