Top stops for zipper fasteners

Claim 1

A ZIPPER FASTENER HAVING A PAIR OF STRINGERS WITH SPACED FASTENER ELEMENTS, A COMPLEMENTARY PAIR OF STRUCTURALLY SIMILAR TOP STOPS ATTACHED TO SAID STRINGERS IN OPPOSED OFFSET RELATION EACH OF WHICH IS SPACED FROM THE TOPMOST FASTENER ELEMENT ON ITS STRINGER APPROXIMATELY HALF THE WIDTH OF THE STOP, EACH STOP CONSISTING OF A GENERALLY U-SHAPED MEMBER CLAMPED AROUND THE STRINGER EDGES AND BEING OF GENERALLY TRIANGULAR CROSS-SECTION TO PROVIDE UPPER AND LOWER SLOPING SURFACES EXTENDING FROM THE APEX OF THE CROSS-SECTION TOWARD THE STRINGER EDGE, AND A SLIDER HAVING A FRONT WING, A BACK WING, AND A CONNECTING NECK DEFINING A Y-SHAPED CHANNEL, SAID STOPS BEING SO DIMENSIONED IN LENGTH AND THICKNESS THAT THEY MAY PASS FREELY INTO THE SLIDER CHANNEL AND ALSO IN WIDTH SO THAT WHEN THE SLIDER IS MOVED TO ITS TOP LIMIT POSITION THEY MAY ENTER SAID CHANNEL TO A DEPTH WHERE BOTH STOPS ARE WELL BELOW THE SLIDER NECK WITH THE SLOPING SURFACES OF ONE STOP ABUTTING THE ENDMOST FASTENER ELEMENT AND THE LOWER SLOPING SURFACE OF THE STOP ON THE OPPOSING STRINGER.