Dispensing closures of the collapsible wall type

Claim 1

A DISPENSING CLOSURE COMPRISING A BASE, MEANS FORMING PART OF SAID BASE FOR ATTACHING THE CLOSURE TO A RECEPTACLE TO DISPENSE THE FLUENT CONTENTS THEREOF, SAID BASE HAVING PORTIONS DEFINING A WELL THEREIN INCLUDING A BOTTOM WALL AND A LATERAL WALL, A NOZZLE OF RESILIENT BUT GENERALLY SHAPE-RETAINING MATERIAL EXTENDING FROM SAID BOTTOM WALL AND SPACED AWAY FROM SAID LATERAL WALL, SAID BASE HAVING A PASSAGE IN FLUID COMMUNICATION WITH THE BORE OF THE NOZZLE ADAPTED TO COMMUNICATE WITH THE INTERIOR OF THE RECEPTACLE WHEN THE CLOSURE IS ATTACHED TO THE RECEPTACLE, THE BORE OF SAID NOZZLE, WHEN THE SAME IS DEFORMED BY BENDING THE SAME UPON ITSELF ALONG A LINE INTERMEDIATE ITS LENGTH TO COLLAPSE THE WALL THEREOF BEING PINCHED CLOSED TO INTERRUPT FLOW FROM THE RECEPTACLE TO THE EXIT END OF THE NOZZLE, MEANS INTERMEDIATE SAID LATERAL WALL AND NOZZLE TO RIGIDIFY SAID NOZZLE OVER A REGION THEREOF SUBSTANTIALLY COEXTENSIVE WITH SAID LATERAL WALL, AND RELEASABLE LATCHING MEANS COACTIVE WITH THE NOZZLE WHEN IN BENT CONDITION TO MAINTAIN CLOSED CONDITION OF THE NOZZLE, THE FORCE EXERTED BY THE LATCHING MEANS, WHEN RELEASED, PERMITTING THE NOZZLE, BY VIRTUE OF ITS INHERENT RESILIENCY, TO RESTOR ITSELF TO OPEN CONDITION FOR FLOW THERETHROUGH.