Leak arresting closure

Claim 1

A LEAK ARRESTING CONNECTING AND CLOSURE FOR FLUID CONTAINERS OF THE TYPE WHEREIN TWO GENERALLY CYLINDRICAL SCREW THREADED PARTS, ONE INCLUDING A HELICAL MAIN GROOVE AND THE OTHER INCLUDING A HELICAL MAIN RIB, ARE ROTATABLY INTERENGAGED TO EFFECT RELATIVE AXIAL MOVEMENT BETWEEN THEM, SAID MAIN RIB HAVING A SECONDARY GROOVE EXTENDING ALONG ITS RIDGE AND SAID MAIN GROOVE HAVING A SECONDARY RIB COMPLEMENTARY TO SAID SECONDARY GROOVE EXTENDING ALONG AND RISING OUT OF THE TROUGH OF SAID MAIN GROOVE AND BEING ARRANGED IN NON-INTERFERING COOPERATIVE RELATION TO SAID MAIN RIB, SAID CONNECTION AND CLOSURE BEING CHARACTERIZED IN THAT SAID SECONDARY GROOVE AND RIB TERMINATE AT THEIR INNER ENDS SHORT OF THE INNER ENDS OF SAID MAIN RIB AND MAIN GROOVE RESPECTIVELY, AND SECONDARY GROOVE BEING GRADUALLY TAPERED IN THE DIRECTION TOWARD ITS INNER END AND SAID SECONDARY RIB BEING CORRESPONDINGLY TAPERED IN THE DIRECTION TOWARD ITS INNER END AND BEING OF A SHAPE AND DIMENSIONS WHEREBY INNER END PORTIONS OF SAID SECONDARY RIB SUBSTANTIALLY OCCUPY INNER END PORTIONS OF SAID SECONDARY GROOVE THEREBY TO MAINTAIN EFFECTIVE LEAK RESISTING NESTING CONTACT WITH OPPOSED CONFORMING SURFACE PORTIONS OF SAID SECONDARY GROOVE.