U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Method for allowing a mobile phone to receive a call through a wireless network for which it is not registered, for emergency purposes

Patent 5864755 Issued on January 26, 1999. Estimated Expiration Date: Icon_subject June 11, 2016. 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

Emergency cellular radiotelephone and method therefor
Patent #: 5465388
Issued on: 11/07/1995
Inventor: Zicker

Private branch exchange capable of adding a calling station ID number to the call signal
Patent #: 5475744
Issued on: 12/12/1995
Inventor: Ikeda

Method for handling calls to a non-registered mobile subscriber in a mobile telephone system
Patent #: 5537457
Issued on: 07/16/1996
Inventor: Lantto, et al.

Emergency wireless telephone and control system, and method
Patent #: 5563931
Issued on: 10/08/1996
Inventor: Bishop, et al.

Communication method and apparatus for providing terminal information to a line connected to plural networks
Patent #: 5604795
Issued on: 02/18/1997
Inventor: Saito

Emergency call back using MSC numbers Patent #: 5689548
Issued on: 11/18/1997
Inventor: Maupin, et al.

Inventors

Assignee

Application

No. 662568 filed on 06/11/1996

US Classes:

455/404.1, Emergency or alarm communication379/37, EMERGENCY OR ALARM COMMUNICATIONS (E.G., WATCHMAN'S CIRCUIT)455/433Home location registration (HLR) or visitor location registration (VLR) detail

Examiners

Primary: Urban, Edward F.
Assistant: Nguyen, Tan T.

International Class

H04Q 007/22

Abstract

A method for operating a wireless telephone system to provide emergency service for a wireless telephone operating in the wireless telephone system. In the present invention, the wireless telephone system receives a request to connect the wireless phone to a predetermined telephone number from the wireless telephone. The telephone system then queries the wireless telephone for a unique identifying number identifying the wireless telephone. The unique identifying number enables the wireless telephone system to connect the wireless telephone to the wireless telephone system. The wireless telephone system maintains a set of direct inward dialing numbers (DIDs) that are used exclusively for emergency calls. Each of the DID allows a caller outside of the wireless telephone system to direct a call to a telephone within the wireless telephone system. The emergency call is assigned one of these DIDs and that DID is linked to the unique identifying number of the telephone placing the emergency call. The wireless telephone is then connected to an emergency operator and the emergency operator is given the assigned DID. The DID enables a call from the emergency operator to the wireless telephone through the wireless telephone system. In one embodiment of the present invention, the DID assigned to the wireless telephone also identifies the antenna closest to the wireless telephone. The assignment between the DID and the unique identifying number is terminated after a predetermined period of time which may be altered by the caller or those servicing the emergency call.

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