Parametric frequency multiplier

Claim 1

A FREQUENCY MULTIPLIER COMPRISING: AN ALTERNATING SIGNAL GENERATOR TO DEVELOP A DRIVING SIGNAL AT A FUNDAMENTAL FREQUENCY; VARIABLE REACTANCE MEANS FOR DEVELOPING A REACTANCE VARIATION AT TWICE SAID FUNDAMENTAL FREQUENCY IN RESPONSE TO SAID DRIVING SIGNAL; SAID VARIABLE REACTANCE MEANS INCLUDING A FIRST REACTANCE HAVING A NONLINEAR REACTANCE VS. VOLTAGE CHARACTERISTIC, A SECOND REACTANCE HAVING A NON-LINEAR REACTANCE VS. VOLTAGE CHARACTERISTIC CONNECTED IN PARALLEL WITH SAID FIRST REACTANCE IN A MANNER TO PROVIDE A REACTANCE VS. VOLTAGE CHARACTERISTIC SYMMETRICALLY OPPOSITE THAT OF SAID FIRST REACTANCE WITH RESPECT TO APPLIED VOLTAGE, AND MEANS FOR MAINTAINING BOTH SAID FIRST AND SECOND REACTANCES NON-CONDUCTIVE OF D.C. CURRENT DURING THE ENTIRE CYCLE OF SAID DRIVING SIGNAL, WHEREBY SIGNALS OF ODD HARMONICS ONLY OF SAID FUNDAMENTAL FRQUENCY ARE PRODUCED; AND A TANK CIRCUIT COUPLED TO SAID VARIABLE REACTANCE MEANS AND TUNED TO A SELECTED ODD HARMONIC FREQUENCY OF SAID FUNDAMENTAL FREQUENCY.