Selective screening of incoming calls for cellular telephone systems
Patent 5473671 Issued on December 5, 1995. Estimated Expiration Date: 
March 11, 2014. 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.
March 11, 2014. 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 ReferencesAutomated call screening Personal communication service with mobility manager Patent #: 5329578 InventorAssigneeApplicationNo. 212547 filed on 03/11/1994US Classes:455/445, Call routing (e.g., to prevent backhaul, routing efficiency, least cost, or alternate routing)379/88.2, Automatic Number Identification (ANI)379/88.26, Recording voice message from non subscriber caller379/196, At switching center379/211.01, Call diversion (e.g., call capture)379/213.01, Intercept (e.g., dead or changed number)379/243, Class of service determination or transmission455/417Call diversionExaminersPrimary: Kuntz, CurtisAssistant: Chernoff, Michael B. Attorney, Agent or FirmInternational ClassesH04Q 007/22H04M 001/56 H04M 015/00 H04M 003/42 AbstractIn connection with cellular telephones, the divergent call treatment technique of the present invention is used to particular advantage. A list of accepted callers is maintained by a service supplier. When a call comes in, a determination is made as to whether the caller is an "accepted" caller. If so, the call is forwarded to the cellular telephone. Otherwise, the caller is offered the option to pay for the call. A willingness on the part of the caller to pay for the call is indicated by a signal from the caller, such as pressing a key on a DTMF pad. In response to such a signal, the call is forwarded to the cellular telephone. In the absence of such a signal, the call is disconnected or diverted.Other References
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