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A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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US Patent 5406616 - Method of completing a telephone call in a telephone system
US Patent Issued on April 11, 1995
Estimated Patent Expiration Date:
February 4, 2014Estimated 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.
Estimated Patent Expiration Date:
February 4, 2014Estimated 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.AbstractA method of effecting automatic callback in a mobile telecommunication system. A calling subscriber is permanently connected to a public switched telephone network and a called subscriber is a mobile unit which moves in the public land mobile network. A centrally located home location register keeps an account of where all mobiles registered in the mobile telecommunication network are located, with the aid of local databases, so-called visitor location registers. The called subscriber calls the called subscriber and finds that the subscriber is busy. The calling subscriber then dials a code, wherewith a reference is stored in a queue in the home location register, this queue relating to the called subscriber. When the called subscriber is free to receive a call, the calling subscriber is informed to this effect. The calling subscriber then lifts his telephone receiver and a connection is set-up between the two subscribers. When the called subscriber answers, the call is considered to have been connected. The home location register (HLR) then removes the reference from the queue.Other References
| InventorAssigneeApplicationNo. 191913 filed on 02/04/1994US Classes:455/433, Home location registration (HLR) or visitor location registration (VLR) detail380/46, Nonlinear (e.g., pseudorandom)455/412.2, Having message notification455/414.1, Special service455/458Specific paging techniqueField of Search340/905, Highway information (e.g., weather, speed limits, etc.)340/907, TRAFFIC CONTROL INDICATOR380/44, Having particular key generator380/46Nonlinear (e.g., pseudorandom)ExaminersPrimary: Kuntz, CurtisAssistant: Cumming, William Attorney, Agent or FirmUS Patent References4899374, Method for a program-controlled telephone switching system in which performance features relating to the setup of a call connection can be initiated from a subscriber stationIssued on: 02/06/1990 Inventor: Van Landeghem4975944, Method of making call-wait and call-alternation in electronic private branch exchange (EPBX) Issued on: 12/04/1990 Inventor: Cho5091942, Authentication system for digital cellular communications Issued on: 02/25/1992 Inventor: Dent5303287, Integrated personal/cellular communications system architecture Issued on: 04/12/1994 Inventor: Laborde5333178Mobile telephone network structure Issued on: 07/26/1994 Inventor: Norell Foreign Patent References
International ClassesH04M 011/00H04L 009/00 Foreign Application Priority Data1993-02-05 SE |
