Patents by Inventor Hamid C. Razavi

Hamid C. Razavi 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 network credit card calling apparatus and method of operation to determine validation and fraudulent use of credit cards in placing telephone calls
    Patent number: 5163086
    Abstract: Apparatus and method of controlling a telephone network to establish connections between calling and called telephone stations in accordance with dialed telephone numbers identified by ones of a plurality of calling party credit cards. The apparatus responds to the receipt of a telephone number and a credit card number from a calling telephone by identifying a company having issued the credit card assigned the received credit card number. A data link connection is established with a data base maintained by the identified company and the received credit card number is transmitted to the identified company during the call sequence for a determination of the validity of the received credit card number.
    Type: Grant
    Filed: December 31, 1990
    Date of Patent: November 10, 1992
    Assignee: AT&T Bell Laboratories
    Inventors: Kathleen M. Ahearn, Nandakishore A. Albal, Daniel D. Cottrell, Richard M. Harris, Julie M. Ladieu-Walton, Hamid C. Razavi