Integral pulse switching system

Claim 1

A SYNCHRONOUSLY SWITCHED ELECTRONIC THERMOSTATIC SYSTEM COMPRISING: (A) A SEMI-CONDUCTOR GATE DEVICE HAVING FIRST AND SECOND MAIN ELECTRODES AND A CONTROL ELECTRODE, SAID DEVICE BECOMING CONDUCTIVE WHEN A VOLTAGE ABOVE A FIRST THRESHOLD VALUE IS APPLIED ACROSS SAID MAIN ELECTRODES AND WHEN A PULSE OF SUFFICIENT MAGNITUDE IS APPLIED TO SAID CONTROL ELECTRODE, SAID DEVICE WHEN ONCE CONDUCTING REMAINING CONDUCTIVE UNTIL THE VOLTAGE ACROSS SAID MAIN ELECTRODES REDUCES TO A VALUE BELOW A SECOND THRESHOLD VALUE; (B) FIRST CIRCUIT MEANS CONNECTED IN PARALLEL ACROSS SAID MAIN ELECTRODES, AND BEING FURTHER CONNECTED TO SAID CONTROL ELECTRODE; (C) SECOND CIRCUIT MEANS CONNECTED IN PARALLEL ACROSS SAID MAIN ELECTRODES, SAID SECOND CIRCUIT MEANS INCLUDING A SENSING ELEMENT RESPONSIVE TO THE AMBIENT OF THE AREA TO BE TEMPERATURE CONTROLLED, THE CONDITION OF SAID SENSING ELEMENT RENDERING ONE OF SAID CIRCUIT MEANS CONDUCTIVE TO THE EXCLUSION OF THE OTHER;