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Portable telephone set with automatic sound generation when it is detected that the set is within a service area of a desired portable communication apparatus

  • US 5,832,386 A
  • Filed: 08/23/1995
  • Issued: 11/03/1998
  • Est. Priority Date: 07/15/1993
  • Status: Expired due to Term
First Claim
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1. A portable telecommunications apparatus capable of communicating with a destination communication apparatus through a radio telecommunications channel, comprising:

  • a detector which detects if the portable telecommunication apparatus has entered a service area of the destination communication apparatus;

    a sound generator which notifies a user by a sound when it is detected by the detector that the portable telecommunications apparatus has entered the service area of the destination communication apparatus; and

    a sounding mode setting device which sets a sounding mode in which the sound is generated by said sound generator when it is detected by the detector that the portable telecommunication apparatus has entered the service area of the destination communication apparatus;

    wherein said destination communication apparatus is a public radio base station connected to a telecommunications network; and

    said portable telecommunication apparatus is a portable telephone set capable of setting up a radio telecommunications channel with said public radio base station and provided with a setting device for setting a telephone number and a photo-sensor for sensing light so that said portable telecommunications apparatus calls the telephone number set by said setting device when said photo-sensor detects light within a predetermined period of time after detection of when the start where the portable telecommunication apparatus is located in the service area of said destination communication apparatus.

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