Improved centrifuge tube

Claim 1

A CENTRIFUGE TUBE COMPRISING A CYLINDRICAL TUBULAR MEMBER, THE TUBULAR MEMBER BEING CLOSED AT ONE END TO FORM THE BOTTOM OF THE CENTRIFUGE TUBE, THE BOTTOM OF THE CENTRIFUGE TUBE HAVING A THREADED NECK PORTION EXTENDING OUTWARD THEREFROM, THE OUTER END OF THE NECK PORTION HAVING A RECESS FORMED THEREIN WITH THE RECESS BEING SURROUNDED BY A SHOULDER, THE BOTTOM OF THE CENTRIFUGE TUBE INCLUDING THE NECK PORTION HAVING A SMALL FIRST OPENING EXTENDING THERETHROUGH, THE OPENING BEING OF A SIZE SUCH AS TO ALLOW PASSAGE OF A HYPODERMIC NEEDLE THERETHROUGH AND THEREBY PROVIDE ACCESS TO THE INTERIOR OF THE TUBE, THE EXTERIOR TERMINUS OF THE FIRST OPENING BEING LOCATED IN THE RECESS FORMED IN THE NECK PORTION, A SEALING MEMBER FORMED OF A RESILIENT SEALING MATERIAL READILY PENETRABLE BY MEANS OF A HYPODERMIC NEEDLE, THE SEALING MEMBER INCLUDING A RELATIVELY THICK PORTION AND A FLANGE PORTION OF REDUCED THICKNESS, THE RELATIVELY THICK PORTION OF THE SEALING MEMBER BEING SEATED IN THE RECESS FORMED IN THE NECK PORTION WITH THE FLANGE PORTION OF REDUCED THICKNESS BEING IN CONTACT WITH THE SHOULDER SURROUNDING THE RECESS, THE FLANGE PORTION OF THE SEALING MEMBER BEINS IN EFFECTIVE SEALING RELATIONSHIP WITH THE SHOULDER SURROUNDING THE RECESS, AND INTERNALLY THREADED CUP-SHAPED NUT MEANS IN THREADED ENGAGEMENT WITH THE NECK PORTION, THE CUP-SHAPED NUT MEANS HAVING AN INTERNAL SURFACE ENGAGING THE SEALING MEMBER FOR SUPPORTING THE RELATIVELY THICK PORTION OF THE SEALING MEMBER AND RETAINING THE FLANGE PORTION OF THE SEALING MEMBER IN EFFECTIVE SEALING RELATIONSHIP WITH THE SHOULDER, THE CUP-SHAPED NUT MEANS HAVING A SMALL OPENING FORMED THERETHROUGH IN AXIAL ALIGNMENT WITH THE FIRST OPENING FOR RECEIVING A HYPODERMIC NEEDLE AND TOGETHER WITH THE FIRST OPENING PROVIDING ACCESS TO THE INTERIOR OF THE TUBE, THE INTERNAL SURFACE OF THE CUP-SHAPED NUT MEANS BEING IN CONTACT WITH THE SEALING MEMBER AND SUPPORTING AGAINST OUTWARD DISPLACEMENT SUBSTANTIALLY THE ENTIRE SURFACE AREA OF THE FLANGE PORTION AND RELATIVELY THICK PORTION WITH THE EXCEPTION OF THE AREA OF THE OPENING IN THE CUP-SHAPED NUT MEANS, AND THE SEALING MEMBER BEING OF UNITARY CONSTRUCTION WHEREBY ACCESS TO THE INTERIOR OF THE TUBE THROUGH THE FIRST OPENING AND THE OPENING FORMED IN THE NUT MEANS IS ATTAINABLE ONLY BY FIRST PENETRATING THROUGH THE SEALING MATERIAL.