Microsyringe for gas-chromatography

Claim 1

A MICROSYRINGE FOR GAS CHROMATOGRAPHY COMPRISING (A) A TUBE, (B) A HOLLOW PLUNGER RECIPROCABLE IN SAID TUBE AND PROJECTING OUTWARDLY FROM ONE END OF SAID TUBE, (C) A SELF-SEALING RESILIENT PLUG SECURED TO THE INNER END OF SAID PLUNGER TO CLOSE THE SAME WHEREBY SAID PLUNGER MAY HOLD A LIQUID, (D) A PISTON SECURED TO SAID PLUNGER INTERMEDIATE THE ENDS OF SAID PLUNGER, (E) MEANS CLOSING THE OTHER END OF SAID TUBE, (F) A HOLLOW NEEDLE REMOVABLY SECURED IN SAID MEANS TO PROJECT AT ONE END INWARDLY INTO SAID TUBE AND TO PROJECT OUTWARDLY AT ITS OPPOSITE END BEYOND SAID OTHER END OF SAID TUBE, SAID NEEDLE BEING OPEN AT BOTH ENDS, (G) A SUPPORTING MEMBER SLIDABLE ON SAID TUBE, (H) A SEALING SLEEVE SECURED TO SAID SUPPORTING MEMBER TO SLIDE ON SAID NEEDLE UPON MOVEMENT OF SAID SUPPORTING MEMBER FORWARDLY AND BACKWARDLY ON SAID TUBE, SAID SEALING SLEEVE, IN THE FORWARD POSITION OF SAID SUPPORTING MEMBER, SERVING TO CLOSE THE OUTWARDLY PROJECTING END OF SAID NEEDLE, SAID RESILIENT PLUG BEING POSITIONED SO THAT IN AN INTERMEDIATE POSITION OF MOVEMENT OF SAID PLUNGER IT CLOSES THE INWARDLY PROJECTING END OF SAID NEEDLE AND SO THAT, IN THE INNERMOST POSITION OF MOVEMENT OF SAID PLUNGER, SAID NEEDLE EXTENDS THROUGH SAID PLUG INTO SAID HOLLOW PLUNGER TO PERMIT LIQUID TO FLOW FROM SAID PLUNGER INTO SAID NEEDLE.