Patents by Inventor Yasuji Yano

Yasuji Yano 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).

  • Power feeding system using two-wire subscriber lines
    Patent number: 6246748
    Abstract: A power feeding system includes a line state detector for detecting an operation state of each of a pair of 2-wire subscriber lines connected to the exchange equipment and a transformer for supplying the DC power to the subscriber terminal through each of the pair of 2-wire subscriber lines connected to the subscriber terminal. When the detector detects a subscriber line test state, a switch circuit detaches the transformer from each of the pair of 2-wire subscriber lines and directly connecting the exchange equipment to the subscriber terminal through each of the pair of 2-wire subscriber lines.
    Type: Grant
    Filed: August 12, 1998
    Date of Patent: June 12, 2001
    Assignee: NEC Corporation
    Inventor: Yasuji Yano