Pulse modulator with transistor switch

Claim 1

A TRANSISTOR SWITCHING APPARATUS FOR CONTROLLING CURRENT FLOW BETWEEN A DIRECT-CURRENT SOURCE OF POTENTIAL AND A LOAD, SAID APPARATUS COMPRISING A TRANSISTOR INCLUDING A BASE AND TWO REMAINING ELEMENTS, SAID TRANSISTOR BEING CONNECTED FROM SAID DIRECT-CURRENT SOURCE OF POTENTIAL TO SAID LOAD WITH SAID TWO REMAINING ELEMENTS; FIRST AND SECONE UNIDIRECTIONAL CONDUCTING ELEMENTS CONNECTED IN THE ORDER NAMED FROM SAID BASE OF SAID TRANSISTOR TO SAID LOAD, SAID FIRST AND SECOND UNIDIRECTIONAL CONDUCTING ELEMENTS BOTH BEING POLED TO ALLOW NORMAL CURRENT FLOW IN A DIRECTION THAT IS THE SAME AS THE DIRECTION OF CURRENT FLOW FROM SAID DIRECT-CURRENT SOURCEOF POTENTIAL TO SAID LOAD AND SAID SECOND UNIDIRECTIONAL CONDUCTOR ELEMENT HAVING A CRITICAL POTENTIAL BELOW WHICH CURRENT DOES NOT FLOW THERETHROUGH; MEANS CONNECTED TO SAID BASE OF SAID TRANSISTOR FOR NORMALLY BIASING SAID TRANSISTOR BY AN AMOUNT LESS THAN SAID CRITICAL POTENTIAL TO PREVENT CURRENT FLOW THERETHROUGH; MEANS COUPLED ACROSS SAID SECOND UNIDIRECTIONAL CONDUCTING ELEMENT FOR CONTROLLABLY INCREASING THE VOLTAGE THEREACROSS BY AN AMOUNT REQUIRED TO NO LESS THAN EXCEED SAID CRITICAL VOLTAGE TO INITIATE CURRENT FOR SAID TRANSISTOR TO FLOW THEREBY TO INITIATE CURRENT FLOW BETWEEN SAID DIRECT-CURRENT SOURCE OF POTENTIAL TO SAID LOAD THROUGH SAID TRANSISTOR; AND MEANS CONNECTED FROM SAID BASE OF SAID TRANSISTOR TO SAID LOAD FOR CONTROLLABLY SHUNTING CURRENT FLOW PAST SAID FIRST AND SECOND UNIDIRECTIONAL CONDUCTING ELEMENTS FOR A DETERMINABLE INTERVAL OF TIME THEREBY TO CAUSE SAID SECOND UNIDIRECTIONAL CONDUCTING ELEMENT TO REVERT TO THE NON-CONDUCTIVE STATE WHEREBY CURRENT FLOW THROUGH SAID TRANSISTOR CEASES AT THE END OF SAID DETERMINABLE INTERVAL.