Patents by Inventor Takeho Yamada

Takeho Yamada 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).

  • Cordless telephone with actuation of off-hook condition by operation of dial key
    Patent number: 5233644
    Abstract: A cordless telephone having a base unit to be connected to a telephone line network and a handset unit to be connected to the base unit through a communication channel upon initiation of a telephone conversation. The cordless telephone includes a detecting circuit provided in the handset unit for detecting removal of the handset unit from a predetermined standby position, and a circuit for generating a command signal such that, when the detection output of the detecting circuit indicates that the handset unit is picked up from the predetermined standby position and, on the condition that a dial key of the handset unit is operated, the base unit is connected to the telephone line network.
    Type: Grant
    Filed: January 3, 1991
    Date of Patent: August 3, 1993
    Assignee: Sony Corporation
    Inventors: Masato Yamagata, Kanji Ohnishi, Takeho Yamada