Patents by Inventor Shinichi Tokita

Shinichi Tokita 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).

  • Office line holding circuit with an automatic release function for direct connection telephone system
    Patent number: 4656660
    Abstract: An office line can be held by a holding path including a thyristor in response to operation of a manual operating hold switch during a call by a telephone set in a direct connection telephone system. A voltage drop on the office line due to an off-condition of any one of the telephone sets in the system caused thereafter can be detected by a capacitor and the thyristor is thereby turned off to release the office line holding condition. The office line holding condition is indicated by a light emission diode, and a hold sound signal is sent out to the office line during the office line holding condition.
    Type: Grant
    Filed: May 9, 1985
    Date of Patent: April 7, 1987
    Assignee: Nitsuko Limited
    Inventors: Toshio Nishimura, Shinichi Tokita