Directory assistance systems
Patent 4979206 Issued on December 18, 1990. Estimated Expiration Date: 
September 18, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 18, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re32012 Memory accessing system Repertory automatic telephone dialing apparatus wherein a name and telephone number are searched by depressing one or more letter code keys Telephone answering apparatus with call-screening capabilities Comprehensive automatic directory assistance apparatus and method thereof Patent #: 4608460 InventorsAssigneeApplicationNo. 409973 filed on 09/18/1989US Classes:379/88.01, Voice activation or recognition379/74, Remote control over telephone line379/84, At switching facility (e.g., central office, switchboard)379/88.25, Message storage in centralized location (e.g., central office, PBX, etc.)379/213.01Intercept (e.g., dead or changed number)ExaminersPrimary: Levy, Stuart S.Assistant: Tomassini, James E. Attorney, Agent or FirmForeign Patent References
International ClassesH04M 003/54H04M 001/64 H04M 003/60 AbstractAn arrangement for obtaining directory assistance automatically and without the assistance of an operator. A customer requesting directory assistance is connected to an automatic speech recognition unit (ASRU) and is prompted to speak commands for identifying the requested directory number. The ASRU converts received speech signals from the customer into data signals for searching a directory number data base. If a directory listing is located, the number of that listing is announced to the customer and the customer is automatically prompted to speak a command indicating whether a call to that number should be automatically established. The telecommunications switching network responds to a positive command by automatically establishing such a connection. Advantageously, such an arrangement provides directory assistance service automatically without requiring special customer equipment.Other References
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