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THREE-WAY CALLING AND CALL-WAITING ARRANGEMENTS FOR STEP-BY-STEP TELEPHONE SYSTEMS

  • US 3,626,107 A
  • Filed: 08/29/1969
  • Issued: 12/07/1971
  • Est. Priority Date: 08/29/1969
  • Status: Expired due to Term
First Claim
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1. A relay tree arrangement to provide three-way calling service for an individual subscriber'"'"''"'"'s line in a telephone switching system of the step-by-step type, said arrangement comprising an auxiliary line circuit, and a relay tree connected between the subscriber'"'"''"'"'s line, his regular line circuit, and said auxiliary line circuit, said relay tree including:

  • a. means normally connecting the subscriber'"'"''"'"'s line to his regular line circuit and enabling the placement and reception of calls through it in the ordinary way, b. seizure means for detecting when the subscriber is off hook, c. means for placing the regular line circuit on hold and connecting the subscriber'"'"''"'"'s line to said auxiliary line circuit in response to the subscriber'"'"''"'"'s going on hook momentarily after said seizure means has detected an off hook condition, d. means for connecting the inputs of the regular line circuit and said auxiliary line circuit in parallel in response to the subscriber'"'"''"'"'s once again going on hook momentarily, and e. means for disconnecting the subscriber'"'"''"'"'s line from said auxiliary line circuit in response to the subscriber'"'"''"'"'s going on hook momentarily a third time.

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