Binary position indicator

Claim 1

MEANS TO INDICATE AT A RECEIVING STATION AT THE TOP OF AN OIL WELL CHANGES IN A CONDITION AT A REMOTE SENDING STATION IN THE OIL WELL, COMPRISING: A FIRST SIGNAL MEANS AT THE SENDING STATION FORMING A PORTION OF THE CHANNEL OF THE FLUID STREAM; A SECOND SIGNAL MEANS MOVABLE ALONG SAID PORTION OF THE CHANNEL; A PLURALITY OF A GIVEN NUMBER OF FIRST CHOKE MEANS SPACED APART ON ONE OF THE TWO SIGNAL MEANS LONGITUDINALLY THEREOF; SECOND CHOKE MEANS ON THE OTHER OF THE TWO SIGNAL MEANS TO COOPERATE WITH THE FIRST CHOKE MEANS TO RESTRICT THE FLUID STREAM TO CREATE A SUCCESSION OF PRESSURE SIGNALS IN THE FLUID STREAM CORRESPONDING IN NUMBER TO SAID GIVEN NUMBER IN RESPONSE TO THE MOVEMENT OF THE SECOND SIGNAL MEANS, SAID SECOND SIGNAL MEANS BEING MOVABLE IN ONE DIRECTION FROM A FIRST POSITION TO A SECOND POSITION IN RESPONSE TO THE FLOWING OF THE FLUID; YIELDING MEANS TO RETURN THE SECOND SIGNAL MEANS FROM ITS SECOND POSITION TO ITS FIRST POSITION WHEREBY THE SECOND SIGNAL MEANS RECIPROCATES ALONG THE FIRST SIGNAL MEANS IN RESPONSE TO STOPPING AND STARTING OF THE FLUID STREAM; MEANS AT THE SENDING STATION INCLUDING A BODY OF INSTRUMENT FLUID TOGETHER WITH MEANS COUPLED TO THE SECOND SIGNAL MEANS TO DISPLACE THE INSTRUMENT FLUID AT A RETARDED RATE FROM A HIGH PRESSURE REGION TO A LOW PRESSURE REGION WHEREBY THE RETARDED RATE NORMALLY DETERMINES THE CHARACTER OF THE PRESSURE SIGNALS; A PAIR OF OVERLAPPING RELATIVELY MOVABLE CODE MEMBERS IN THE INSTRUMENT FLUID; MEANS RESPONSIVE TO CHANGES IN SAID CONDITION TO CREATE RELATIVE MOVEMENT BETWEEN THE TWO CODE MEMBERS TO INDICATE THE CHANGES; CODE APERTURES IN THE TWO CODE MEMBERS RESPECTIVELY TO COINCIDE AT DIFFERENT RELATIVE POSITIONS OF THE TWO CODE MEMBERS; AND AN APERTURED SENSING MEMBER IN THE INSTRUMENT FLUID OPERATIVELY RELATED TO THE SECOND SIGNAL MEANS TO MOVE SIMULTANEOUSLY THEREWITH ALONG THE PAIR OF OVERLAPPING CODE MEMBERS TO BYPASS THE INSTRUMENT FLUID TO THE LOW PRESSURE REGION THROUGH THE COINCIDING CODE APERTURES OF THE TWO CODE MEMBERS AT FLUIDRESTRICTING POSITIONS OF THE SECOND SIGNAL MEANS WHEREBY SUCH COINCIDENCE ACCELERATES THE SECOND SIGNAL MEANS TO PRODUCE SIGNALS DISTINCT FROM THE SIGNALS PRODUCED WHEN THE SIGNAL SIGNALS MEANS IS NOT ACCELERATED, SAID CODE APERTURES BEING DISTRIBUTED TO CREATE DIFFERENT SEQUENCES OF THE DISTINCTIVE SIGNALS OVER THE RANGE OF MOVEMENT OF THE SECOND SIGNAL MEANS TO INDICATE DIFFERENT RELATIVE POSITIONS OF THE TWO OVERLAPPING CODE MEMBERS.