Pressure carburetors

Claim 1

AN INTERNAL COMBUSTION ENGINE CARBURETOR WHICH COMPRISES, IN COMBINATION, AN AIR PIPE LEADING TO THE ENGINE TO BE FED BY THE CARBURETOR, A THROTTLE VALVE IN SAID AIR PIPE, THROTTLING MEANS MOVABLY MOUNTED IN SAID AIR PIPE UPSTREAM OF SAID THROTTLE VALVE, SO THAT AN AIR PIPE PORTION IS LIMITED BETWEEN SAID THROTTLING MEANS AND SAID THROTTLE VALVE, MEANS RESPONSIVE TO THE AIR PRESSURE DIFFERENCE BETWEEN THE UPSTREAM AND DOWNSTREAM SIDES OF SAID THROTTLING MEANS FOR AUTOMATICALLY CONTROLLING SAID THROTTLING MEANS, MEANS FIXED WITH RESPECT TO SAID AIR PIPE FORMING A FUEL CHAMBER, MEANS INCLUDING A PART FIXED WITH RESPECT TO SAID AIR PIPE AND A MOVABLE PART OPERATIVELY CONNECTED WITH SAID THROTTLING MEANS, FORMING A FUEL PASSAGE OPENING INTO SAID CHAMBER AND OF A VARIABLE CROSS SECTION AREA PROPORTIONAL TO THAT OF THE AIR PASSAGE CONTROLLED BY SAID THROTTLING MEANS IN SAID AIR PIPE, MEANS FOR FEEDING SAID FUEL PASSAGE WITH FUEL UNDER A PRESSURE EQUAL TO THE AIR PRESSURE IN SAID AIR PILE UNSTREAM OF SAID THROTTLING MEANS, MEANS FORMING AN INJECTION ORIFICE OPENING INTO SAID AIR PIPE DOWNSTREAM OF SAID THROTTLE VALVE, A CONDUIT LEADING FROM SAID CHAMBER TO SAID INJECTION ORIFICE, A PUMP MOUNTED IN SAID CONDUIT TO FORCE FUEL FROM SAID CHAMBER TO SAID INJECTION ORIFICE AND MEANS FORMING A VENTING PASSAGE BETWEEN SAID CHAMBER AND SAID AIR PIPE PORTION SO THAT THE PRESSURE IS THE SAME IS SAID CHAMBER AND IN SAID PIPE PORTION.