Series transistor voltage regulators with filter circuits

Claim 1

AN ELECTRIC FILTER CIRCUIT COMPRISING FIRST AND SECOND INPUT TERMINALS, FIRST AND SECOND OUTPUT TERMINALS, A TRANSFORMER, THE PRIMARY WINDING OF WHICH IS CONNECTED IN A FIRST PATH BETWEEN THE FIRST INPUT TERMINAL AND THE FIRST OUTPUT TERMINAL, A PATH BETWEEN THE SECOND INPUT TERMINAL AND THE FIRST OUTPUT TERMINAL AND COMPRISING, IN SERIES, A SECONDARY WINDING OF SAID TRANSFORMER, FIRST AND SECOND RECTIFIER ELEMENTS AND AN INDUCTIVE ELEMENT, A THIRD PATH BETWEEN SAID SECOND INPUT TERMINAL AND SAID SECOND OUTPUT TERMINAL AND A CAPACITIVE ELEMENT CONNECTED BETWEEN THE JUNCTION OF SAID RECTIFIER ELEMENTS, AND SAID THIRD PATH, THE RECTIFIER ELEMENTS BEING SIMILARLY DIRECTED AND CONNECTED SO THAT WHEN AN INCREASING CURRENT IS FLOWING IN SAID PRIMARY WINDING THE VOLTAGE INDUCED IN SAID SECONDARY WINDING BIASES SAID RECTIFIER ELEMENTS IN THE REVERSE DIRECTION, BUT WHEN A DECREASING CURRENT IS FLOWING IN SAID PRIMARY WINDING THE VOLTAGE INDUCED IN SAID SECONDARY WINDING BIASES SAID RECTIFIER ELEMENTS IN THE FORWARD DIRECTION CURRENT THEN FLOWING BETWEEN SAID SECOND INPUT TERMINAL AND SAID FIRST OUTPUT TERMINAL BY WAY OF SAID SECONDARY WINDING.