Nor logic switching circuit having substantially constant output voltage characteristic

Claim 1

IN AN ELECTRICAL SWITCHING APPARATUS OPERATIVE WITH AT LEAST ONE INPUT CIRCUIT AND AT LEAST ONE OUTPUT CIRCUIT, THE COMBINATION OF A FIRST TRANSISTOR DEVICE HAVING BASE, EMITTER AND COLLECTOR ELEMENTS, A SECOND TRANSISTOR DEVICE HAVING BASE, EMITTER AND COLLECTOR ELEMENTS, A FIRST VOLTAGE SUPPLY CONNECTED BETWEEN THE BASE AND EMITTER ELEMENTS OF SAID FIRST TRANSISTOR DEVICE FOR BIASING SAID FIRST TRANSISTOR DEVICE TO ITS UNSATURATED OPERATING CONDITION, A SECOND VOLTAGE SUPPLY CONNECTED IN A SERIES CONTROL CIRCUIT INCLUDING SAID EMITTER AND COLLECTOR ELEMENTS OF THE FIRST TRANSISTOR DEVICE AND THE EMITTER AND COLLECTOR ELEMENTS OF THE SECOND TRANSISTOR DEVICE, SAID SWITCHING APPARATUS BEING OPERATIVE TO PROVIDE A FIRST SUBSTANTIALLY CONSTANT VOLTAGE OUTPUT SIGNAL WHEN SAID FIRST TRANSISTOR DEVICE IS OPERATING IN ITS UNSATURATED CONDITION AND FOR PROVIDING A SECOND SUBSTANTIALLY CONSTANT VOLTAGE OUTPUT SIGNAL WHEN SAID FIRST TRANSISTOR DEVICE IS OPERATING IN ITS SATURATED CONDITION, A THIRD VOLTAGE SUPPLY CONNECTED BETWEEN THE BASE ELEMENT OF SAID