Patents by Inventor Mayumi Sugihara

Mayumi Sugihara 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).

  • Charging and discharging circuit
    Patent number: 4458111
    Abstract: A charge-discharge switching circuit for use in a cordless telephone which automatically connects and disconnects the receiver and transmitter circuits from a rechargeable storage battery in the handset in response to the base unit charger signal so that the transmitter and receiver circuits are disconnected from the storage battery when it is being charged by the charger in the base unit of the cordless telephone.
    Type: Grant
    Filed: January 21, 1982
    Date of Patent: July 3, 1984
    Assignee: Tandy Corporation
    Inventor: Mayumi Sugihara