Temperature compensated regulator for battery charging

Claim 1

IN A VOLTAGE SUPPLY HAVING A CHARGEABLE BATTERY AND A MOTOR DRIVEN D.C. GENERATOR CONNECTED TO SAID BATTERY, SAID GENERATOR INCLUDING A FIELD COIL WHICH WHEN ENERGIZED CAUSES SAID GENERATOR TO PRODUCE ELECTRICAL ENERGY FOR CHARGING SAID BATTERY, MEANS FOR REGULATING THE CHARGE APPLIED TO SAID BATTERY COMPRISING A CONTROL DEVICE HAVING INPUT, OUTPUT AND CONTROL TERMINALS, A CONNECTION BETWEEN SAID INPUT TERMINAL AND ONE SIDE OF SAID BATTERY, A CONNECTION BETWEEN SAID OUTPUT TERMINAL AND ONE SIDE OF SAID FIELD COIL, THE OTHER SIDE OF SAID FIELD COIL BEING RETURNED TO THE OTHER SIDE OF SAID BATTERY, A RETURN CIRCUIT INCLUDING A TAPPED SERIES IMPEDANCE BETWEEN SAID CONTROL TERMINAL AND THE OTHER SIDE OF SAID BATTERY TO CAUSE SAID DEVICE TO MAINTAIN CURRENT FLOW FROM SAID BATTERY TO SAID FIELD COIL, A SECOND CONTROL DEVICE HAVING INPUT AND OUTPUT TERMINALS CONNECTED BETWEEN THE FIRST SAID INPUT TERMINAL AND THE TAP ON SAID IMPEDANCE RESPECTIVELY AND A RETURN CIRCUIT INCLUDING A NEGATIVE TEMPERATURE COEFFICIENT RECTIFIER CONNECTING THE LAST SAID CONTROL TERMINAL TO THE OTHER SIDE OF SAID BATTERY, SAID RECTIFIER BEING EFFECTIVELY SUBJECTED TO THE FULL VOLTAGE OF SAID BATTERY AND BECOMING CONDUCTIVE UPON A PREDETERMINED RISE IN THE BATTERY VOLTAGE AS A RESULT OF THE OPERATION OF SAID GENERATOR TO APPLY SUBSTANTIALLY THE ENTIRE INCREASED BATTERY VOLTAGE BETWEEN THE INPUT AND CONTROL TERMINALS OF SAID SECOND DEVICE AND THEREBY INTERRUPT THE FLOW OF CURRENT IN THE FIELD COIL, SAID PREDETERMINED VOLTAGE RISE DECREASING WITH AN INCREASE IN TEMPERATURE, AND SAID RECTIFIER BEING POSITIONED IN AND RESPONSIVE TO THE TEMPERATURE OF SAID BATTERY.