Superconductor and gate employing single elongated, simply connected thin film as gate element

Claim 1

IN COMBINATION, A THIN FILM SIMPLY CONNECTED SUPERCONDUCTIVE ELEMENT INCLUDING A PAIR OF SPACED TERMINALS DEFINING A PATH OF CURRENT FLOW THROUGH SAID ELEMENT, FIRST MAGNETIC FIELD PRODUCING MEANS MOUNTED ADJACENT TO SAID ELEMENT FOR SUBJECTING SAID ELEMENT TO A FIRST MAGNETIC FIELD OF SUFFICIENT MAGNITUDE TO CAUSE A CHANGE FROM THE SUPERCONDUCTING TO THE RESISTIVE STATE OF A FIRST PORTION OF SAID ELEMENT EXTENDING ONLY PART WAY ACROSS SAID CURRENT PATH BUT OF INSUFFICIENT MAGNITUDE TO CAUSE A CHANGE IN STATE OF REGIONS OF SAID ELEMENT EXTENDING FULLY ACROSS SAID CURRENT PATH, SECOND MAGNETIC FIELD PRODUCING MEANS MOUNTED ADJACENT TO SAID ELEMENT FOR SUBJECTING SAID ELEMENT TO A SECOND MAGNETIC FIELD OF SUFFICIENT MAGNITUDE TO CAUSE A CHANGE FROM THE SUPERCONDUCTING TO THE RESISTIVE STATE OF A SECOND PORTION OF SAID ELEMENT ADJOINING SAID FIRST PORTION AND EXTENDING ACROSS SAID CURRENT PATH THE REMAINDER OF THE WAY NOT COVERED BY SAID FIRST PORTION, SAID SECOND MAGNETIC FIELD BEING INSUFFICIENT TO CAUSE A CHANGE IN STATE OF REGIONS OF SAID ELEMENT EXTENDING FULLY ACROSS SAID CURRENT PATH, WHEREBY ONLY THE CONCURRENCE OF SAID FIRST AND SECOND MAGNETIC FIELDS WILL CAUSE A CHANGE IN STATE OF BOTH OF SAID PORTIONS AND HENCE OF REGIONS OF SAID ELEMENT THAT EXTEND FULLY ACROSS SAID CURRENT PATH.