Phase shifting networks

Claim 1

A NETWORK CONVERTING AN INPUT SIGNAL OF A PREDETERMINED FREQUENCY TO A PHASE SHIFTED OUTPUT SIGNAL OF THE SAME FREQUENCY COMPRISING A PAIR OF SERIALLY CONNECTED VOLTAGE SOURCES HAVING A COMMON JUNCTION THEREBETWEEN AND ARRANGED SO AS TO PROVIDE THE INPUT SIGNAL, A PHASE SHIFTER INCLUDING SERIALLY CONNECTED RESISTIVE AND REACTIVE MEANS ARRANGED IN SERIES WITH THE VOLTAGE SOURCES AND ALSO HAVING A COMMON JUNCTION THEREBETWEEN, THE RESISTIVE MEANS INCLUDING A PAIR OF UNDIRECTIONAL CONDUCTING DEVICES OF SIMILAR CHARACTERISTICS, AND MEANS APPLYING A CONTROL SIGNAL FREQUENCY THAT IS SUBSTANTIALLY LESS THAN THE INPUT SIGNAL FREQUENCY TO THE DEVICES SO AS TO VARY THE RESISTANCE THEREOF, THE DEVICE BEING ARRANGED IN SERIES OPPOSED RELATION SO AS TO SUBSTANTIALLY ELIMINATE THE INFLUENCE OF THE ALTERNATIONS OF THE INPUT SIGNAL ON THE RESISTANCE OF THE DEVICES AND THEREBY DEVELOP AT THE COMMON JUNCTIONS AN OUTPUT SIGNAL THAT IS PHASE SHIFTED RELATIVE TO THE INPUT SIGNAL IN ACCORDANCE WITH THE MAGNITUDE OF THE CONTROL SIGNAL.