Asynchronous data system transmitting before each data pulse a pulse of opposite polarity

Claim 1

A DATA TRANSMISSION SYSTEM COMPRISING: A SOURCE OF DIGITAL DATA SIGNALS, SAID DIGITAL DATA BEING MANIFESTED BY SERIATELY OCCURRING ALTERNATE POLARITY DATA PULSES, MEANS COUPLED TO SAID SOURCE FOR DELAYING EACH OF SAID DATA PULSES A FIXED TIME PERIOD, MEANS COUPLED TO SAID SOURCE FOR INVERTING THE POLARITIES OF EACH OF SAID DATA PULSES TO FORM GATING PULSES, MEANS FOR COMBINING SAID DELAYED DATA PULSES AND SAID GATING PULSES TO FORM A COMPOSITE SIGNAL WHEREIN EACH OF SAID DATA PULSES ARE PRECEDED AT SAID FIXED TIME PERIOD BY AN OPPOSITE POLARITY PULSE, MEANS FOR RECEIVING SAID COMPOSITE SIGNAL INCLUDING, BISTABLE MEANS FOR PRODUCING AN OUTPUT SIGNAL WHICH ALTERNATES BETWEEN A FIRST AND SECOND SIGNAL LEVEL IN RESPONSE TO INPUT PULSES APPLIED THERETO, AND SWITCHING MEANS DISPOSED BETWEEN SAID RECEIVING MEANS AND SAID BISTABLE MEANS FOR SELECTIVELY COUPLING SAID COMPOSITE SIGNAL TO SAID BISTABLE MEANS AT PREDETERMINED TIMES SUCH THAT SAID BISTABLE MEANS CHANGES OUTPUT SIGNAL LEVEL ONLY IN RESPONSE TO SAID DATA PULSES.