Thermostatic oven controller with automatic reset

Claim 1

A TEMPERATURE CONTROL SYSTEM COMPRISING: AN OVEN, AN ELECTRICAL HEATING MEANS FOR SAID OVEN, TEMPERATURE CONTROL MEANS FOR SENSING WHEN THE TEMPERATURE OF SAID OVEN DEVIATES FROM A SET POINT, POWER MEANS ADAPTED TO RECEIVE ALTERNATING CURRENT ENERGY, A SWITCH HAVING A PAIR OF CURRENT CONDUCTING ELECTRODES AND A GATE ELECTRODE, SAID CURRENT CONDUCTING ELECTRODES INTERCONNECTING SAID POWER MEANS AND SAID HEATING MEANS, A TIMING CAPACITOR, MEANS FOR PERIODICALLY CHARGING SAID TIMING CAPACITOR AT A VARYING RATE, MEANS FOR VARYING THE MAGNITUDE OF SAID RATE INCLUDING A RESISTANCE ELEMENT HAVING A NEGATIVE TEMPERATURE COEFFICIENT OF RESISTANCE AND A VARIABLE IMPEDANCE MEANS RESPONSIVE TO SAID TEMPERATURE CONTROL MEANS SERIALLY CONNECTED TO SAID TIMING CAPACITOR, TRIGGER CIRCUIT MEANS CONNECTED TO SAID TIMING CAPACITOR FOR PASSING A GATING SIGNAL TO SAID GATE ELECTRODE WHENEVER THE CHARGE ACROSS SAID TIMING CAPACITOR EQUALS A PREDETERMINED VALUE, AND ADDITIONAL HEATING MEANS RESPONSIVE TO THE ENERGY SUPPLIED TO SAID ELECTRICAL HEATING MEANS FOR VARYING THE TEMPERATURE OF SAID RESISTANCE ELEMENT, THEREBY TO VARY THE RESPONSE CHARACTERISTIC OF SAID OVEN TO TEMPERATURE CHANGES.