Patents by Inventor Taichi Kosako

Taichi Kosako 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).

  • Ring trip detection circuit
    Patent number: 5335271
    Abstract: A ring trip detection circuit detects an OFF-hooked state of a telephone receiver during ringing of a telephone set by detecting a change in a voltage across two terminals of a transmission resistor through which a ringing signal is supplied to the telephone set from a ringing signal source.
    Type: Grant
    Filed: September 3, 1992
    Date of Patent: August 2, 1994
    Assignee: Fujitsu Limited
    Inventors: Kenji Takato, Kazumi Kinoshita, Kiyoshi Kurosaki, Taichi Kosako, Kazuyuki Minohara