Three-level inverter and latch circuits

Claim 1

APPARATUS FOR STORING AN INPUT SIGNAL CABPABLE OF EXISTING AT A FIRST, A SECOND, OR A THIRD SIGNALS LEVEL STABLE PRISING: A FIRST BISTABLE CIRCUIT HAVING A FIRST LEVEL STABLE STATE DURING WHICH A SIGNAL IS PROVIDED AT ITS OUTPUT TERMINAL CORRESPONDING TO SAID FIRST SIGNAL LEVEL AND A THIRD LEVEL STABLE STATE DURING WHICH A SIGNAL IS PROVIDED AT ITS OUTPUT TERMINAL CORRESPONDING TO SAID THIRD SIGNAL LEVEL; A SECOND BISTABLE CIRCUIT HAVING A SECOND LEVEL STABLE STATE DURING WHICH A SIGNAL IS PROVIDED AT ITS OUTPUT TERMINAL CORRESPONDING TO SAID SECOND SIGNAL LEVEL; CONTROL MEANS CONNECTED TO SAID FIRST AND SECOND BISTABLE CIRCUITS FOR ACCEPTING SAID INPUT SIGNAL AND PLACING SAID FIRST BISTABLE CIRCUIT IN ITS FIRST STATE WHEN SAID INPUT SIGNAL IS AT SAID FIRST LEVEL AND IN ITS THIRD STATE WHEN SAID INPUT SIGNAL IS AT SAID THRID LEVEL AND PLACING SAID SECOND BISTABLE CIRCUIT IN ITS SECOND STATE WHEN SAID INPUT SIGNAL IS AT SAID SECOND LEVEL; CIRCUITS FOR CAUSING THE TO SAID FIRST AND SECOND BISTABLE CIRCUITS FOR CAUSING THE OUTPUT OF SAID FIRST BISTABLE CIRCUIT TO OVERRIDE THE OUTPUT OF SAID SECOND BISTABLE CIRCUIT AFTER SAID INPUT SIGNAL HAS MADE AN EXCURSION FROM THE SECOND LEVEL.