×

Security system

  • US 3,925,763 A
  • Filed: 09/13/1973
  • Issued: 12/09/1975
  • Est. Priority Date: 09/13/1973
  • Status: Expired due to Term
First Claim
Patent Images

1. A security system for a given security area, said system comprising:

  • a. security breach detecting means actuable responsively to occurrence of a breach condition within said area, b. a sensor for encoding and transmitting self-identification signals responsively to actuation of said breach detecting means, c. communication means comprising two lines of a secondary power distribution system of which at least one line is a phase line, d. line converter means connected between said two lines of the secondary power distribution system, said converter means receiving said coded signals, adding its own self-identification code thereto, and transmitting the resulting synthesized line converter signal at radio frequencies along said two lines, and e. master controller means comprising;

    i. receiver means coupled to said two lines for receiving line converter signals and decoding a plurality of trains of coded line converter messages, ii. variable memory means coupled to said receiver means for storing a plurality of said coded line converter messages, iii. receiver memory means coupled to said receiver means for identifying the nature of the transmission mode of each line converter signal received by said receiver means, and iv. status memory means coupled to said variable memory means and said receiver memory means for synthesizing a status message from said coded line converter messages, the nature of the transmission mode of each of the line converter signals received and the status of the said security system including said master controller.

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