Patents by Inventor Tadikonda Narasimha Rao

Tadikonda Narasimha Rao 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).

  • Telephone ringing generators
    Patent number: 4015091
    Abstract: A single channel carrier system for telephone service is disclosed including a remote terminal having a battery charger for charging a battery during idle periods to power the remote carrier electronics. The remote electronics include a ringing generator and supervisory circuits to implement normal telephone supervision over the carrier channel.The ringing generator is a DC-to-DC converter for stepping the battery voltage up to ringing voltage level. This high unipolar ringing voltage is then interrupted at a 20 Hz rate during the ringing portion of the ringing cycle. Simple diodes serve to isolate the unipolar ringing signals from other portions of the circuit.
    Type: Grant
    Filed: December 5, 1975
    Date of Patent: March 29, 1977
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Tadikonda Narasimha Rao, Rouben Toumani