Non-destructive magnetic memory

Claim 1

A BINARY STORAGE APPARATUS COMPRISING A MAGNETIC CORE MADE OF MATERIAL EXHIBITING A FAMILY OF STATIC RECTANGULAR HYSTERESIS LOOPS AND A GIVEN TURNOVER FIELD STRENGTH, SAID FAMILY OF LOOPS DEFINING AN OUTER MAJOR LOOP AND A PLURALITY OF INNER MINOR LOOPS EACH EXHIBITING RESPECTIVE STATIC SWITCHING THRESHOLDS, INPUT MEANS COUPLING SAID CORE OF ESTABLISHING SAID CORE IN EITHER A DATUM OR AN OPPOSITE STABLE STATE ON SAID MAJOR LOOP TO REPRESENT SAID BINARY INFORMATION, AND MEANS FOR NON-DESTRUCTIVELY READING OUT THE STATE OF SAID CORE COMPRISING, MEANS INCLUDING SAID INPUT MEANS FOR APPLYING AN INTERROGATION FIELD TO SAID CORE TENDING TO SATURATE SAID CORE IN THE OPPOSITE STATE HAVING A MAGNITUDE IN EXCESS OF THE STATIC THRESHOLD OF THE MAJOR LOOP BUT A FIELD STRENGTH INSUFFICIENT TO OVERCOME THE TURNOVER FIELD STRENGTH INSUFAND MEANS FOR APPLYING A BIAS FIELD TO SAID CORE TENDING TO SATURATE SAID CORE IN THE DATUM STATE HAVING A MAGNITUDE IN EXCESS OF THE STATIC THRESHOLD OF A PREDETERMINED ONE OF SAID MINOR LOOPS BUT LESS THAN THE STATIC THRESHOLD OF SAID MAJOR LOOP.