Two stage fluid compressing devices

Claim 1

A TWO-STAGE FLUID COMPRESSING DEVICE COMPRISING AN OUTER CYLINDER DEFINING AN OUTER CHAMBER AND BEING CLOSED AT ONE END AND OPEN AXIALLY AT THE OTHER END, AN INNER CYLINDER DEFINING AN INNER CHAMBER AND BEING HOUSED ENTIRELY AND COAXIALLY WITHIN SAID OUTER CYLINDER, ONE END OF SAID INNER CYLINDER BEING CLOSED AND RIGIDLY SECURED TO THE CLOSED END OF SAID OUTER CYLINDER AND THE OTHER END OF SAID INNER CYLINDER OPENING AXIALLY INTO SAID OUTER CHAMBER AND BEING SPACED AXIALLY INWARD FROM SAID OPEN END OF SAID OUTER CYLINDER, SAID INNER CYLINDER FURTHER HAVING A TRANSVERSE PORT EXTENDING THERETHROUGH ADJACENT SAID OTHER END OF THE INNER CYLINDER FOR COMMUNICATING THE INNER CHAMBER WITH THE OUTER CHAMBER, AN INNER PISTON SLIDABLE IN SAID INNER CYLINDER THROUGH SAID OTHER END OF THE LATTER, MEANS FOR FEEDING A PRECOMPRESSED FLUID INTO SAID OUTER CHAMBER AND INCLUDING MEANS DEFINING AN ENTRY PORT AT A POINT NEAR THE OPEN END OF SAID OUTER CYLINDER, AN OUTER PISTON SLIDABLE IN SAID OUTER CYLINDER THROUGH SAID OPEN END OF THE LATTER AND FACING THE OUTER END OF THE INNER PISTON, AND HYDRAULICALLY ACTUATED MEANS OPERATIVE TO URGE SAID OUTER PISTON AXIALLY INTO SAID OUTER CYLINDER FOR SUCCESSIVELY CLOSING SAID ENTRY PORT OF THE MEANS FEEDING PRECOMPRESSED FLUID, COMPRESSING THE PRECOMPRESSED FLUID TRAPPED IN THE OUTER AND INNER CHAMBERS BY CLOSING OF THE ENTRY PORT AND THEN URGING THE INNER PISTON AXIALLY INTO THE INNER CYLINDER SO THAT SAID INNER PISTON INITIALLY CLOSES SAID TRANSVERSE PORT OF THE INNER CYLINDER FOR ISOLATING SAID INNER CHAMBER FROM SAID OUTER CHAMBER AND THEREAFTER COMPRESSES THE FLUID IN THE INNER CHAMBER TO A PRESSURE RISING CONSIDERABLY ABOVE THAT PREVAILING IN THE OUTER CHAMBER.