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Self Defense Weapon With Memo

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: Icon_subject 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.
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Abstract

A 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

  • C & P Telephone White Pages relating to certain optional services that include Repeat Call, pp. 37-41 (Jan. 1994)
  • Recommendation GSM 03.02 Network Architecture, Version 3.1.4, ETSI TC GSM (Jan. 15, 1990)
  • Patent Abstract of Japan, vol. 16, No. 18, JP 3-235563 (Oct. 21, 1991)
  • Patent Abstract of Japan, vol. 15, No. 448, JP 3-190494 (Aug. 20, 1991)
  • Patent Abstract of Japan, vol. 16, No. 340, JP 4-101596 (Apr. 3, 1992)
  • Delory, Treillard, "Security and Saturation Solutions for GSM", Telephone Engineer and Management, vol. 95 1990
  • Rahnema, "Overview of the GSM System and Protocol Architecture" IEEE Communications Magazine, Apr. 199

Inventor

Assignee

Application

No. 191913 filed on 02/04/1994

US 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 technique

Field of Search

340/905, Highway information (e.g., weather, speed limits, etc.)340/907, TRAFFIC CONTROL INDICATOR380/44, Having particular key generator380/46Nonlinear (e.g., pseudorandom)

Examiners

Primary: Kuntz, Curtis
Assistant: Cumming, William

Attorney, Agent or Firm

US Patent References

4899374, 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 station
Issued on: 02/06/1990
Inventor: Van Landeghem
4975944, Method of making call-wait and call-alternation in electronic private branch exchange (EPBX)
Issued on: 12/04/1990
Inventor: Cho
5091942, Authentication system for digital cellular communications
Issued on: 02/25/1992
Inventor: Dent
5303287, Integrated personal/cellular communications system architecture
Issued on: 04/12/1994
Inventor: Laborde
5333178Mobile telephone network structure
Issued on: 07/26/1994
Inventor: Norell

Foreign Patent References

  • 503813 EP. 09/20/1992
  • 2937643 DE. 05/20/1982
  • 2812953 DE. 11/20/1983
  • 2616062 DE. 05/20/1987
  • 3926305 DE. 02/20/1991
  • 4035400 DE. 08/20/1991
  • 416865 SE. 02/20/1981

International Classes

H04M 011/00
H04L 009/00

Foreign Application Priority Data

1993-02-05 SE

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