Schmitt trigger having negative set and reset voltage levels determined by input clamping networks

Claim 1

A TRIGGER CIRCUIT HAVING RESET AND SET CONDITIONS OF CONDUCTION WHEREIN THE VOLTAGE LEVEL OF THE RESET INPUT SIGNAL DIFFERS FROM THE VOLTAGE LEVEL OF THE SET INPUT SIGNAL AND BOTH OF SAID INPUT SIGNAL VOLTAGE LEVELS ARE NEGATIVE WITH RESPECT TO GROUND POTENTIAL COMPRISING: FIRST AND SECOND CURRENT CONDUCTING DEVICES EACH HAVING AN INPUT ELEMENT, AN OUTPUT ELEMENT AND A CONTROL ELEMENT; INPUT SIGNAL MEANS CONNECTED TO THE CONTROL ELEMENT OF SAID FIRST ELECTRON CONDUCTING DEVICE; CIRCUITRY MEANS COUPLING THE OUTPUT ELEMENT OF SAID FIRST CURRENT CONDUCTING DEVICE TO THE CONTROL ELEMENT OF SAID SECOND CURRENT CONDUCTING DEVICE SUCH THAT WHEN SAID FIRST CURRENT CONDUCTING DEVICE CONDUCTS IT WILL CAUSE SAID SECOND CURRENT CONDUCTING DEVICE TO BE CUT OFF AND SUCH THAT WHEN SAID FIRST CURRENT CONDUCTING DEVICE IS NONCONDUCTING SAID SECOND CURRENT CONDUCTING DEVICE WILL BE CONDUCTING; LOAD MEANS CONNECTED TO SAID OUTPUT ELEMENT OF SAID SECOND CURRENT CONDUCTING DEVICE; FIRST NETWORK MEANS INCLUDING A FIRST UNIDIRECTIONAL CURRENT CONDUCTING DEVICE INDEPENDENTLY COUPLED TO THE INPUT ELEMENTS OF BOTH OF SAID CURRENT CONDUCTING DEVICES TO PROVIDE A FIRST CONSTANT VALUED VOLTAGE SOURCE THERETO WHICH DETERMINES THE VOLTAGE LEVEL OF SAID SET INPUT SIGNAL; AND SECOND NETWORK MEANS INCLUDING A SECOND UNIDIRECTIONAL CURRENT CONDUCTING DEVICE INDEPENDENTLY COUPLED TO THE INPUT ELEMENTS OF BOTH OF SAID CURRENT CONDUCTING DEVICES TO PROVIDE A SECOND CONSTANT VALUED VOLTAGE SOURCE THERETO WHICH DETERMINES THE VOLTAGE LEVEL OF SAID RESET INPUT SIGNAL.