×

Emergency call system

  • US 5,729,203 A
  • Filed: 05/24/1995
  • Issued: 03/17/1998
  • Est. Priority Date: 06/28/1994
  • Status: Expired due to Fees
First Claim
Patent Images

1. An emergency call system for transmitting an emergency call of a subscriber to an emergency call center via a communication channel, comprising:

  • a portable transmitting device having a call button which is operable for transmitting said emergency call of said subscriber, a physical information sensor which obtains a physical information of said subscriber, a memory which stores a batch of physical information detected by said physical information sensor for a predetermined time duration, and a signal transmitter which transmits a signal at a predetermined modulation frequency, said portable transmitting device being adapted to be worn on said subscriber, and transmitting from said signal transmitter an emergency call signal indicative of an operation of said call button and a physical information signal representing said batch of physical information stored in said memory for said predetermined time duration in response to said operation of said call button; and

    a signal receiving and call device having a signal receiver which receives said emergency call and physical information signals transmitted from said signal transmitter of said portable transmitting device, and a communication apparatus which transmits the emergency call signal and the physical information signal received by said signal receiver to said emergency call center via said communication channel, in response to reception of the signals by the signal receiver, said signal receiving and call device being disposed in a place where said subscriber,said portable transmitting device further comprising a wearing sensor which identifies whether said portable transmitting device is worn on said subscriber and outputs a wearing signal indicating that the portable transmitting device is worn on the subscriber, wherein said signal transmitter transmits said wearing signal and said emergency call and physical information signals in response to said operation of said call button.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×