Pressure container with recessed top

Claim 1

A PRESSURE CONTAINER FOR DISPENSING MATERIALS COMPRISING IN COMBINATION, AN OUTER RIGID BODY PORTION OF GREATER VERTICAL HEIGHT THAN ITS DIAMETER, AN OUTER RIGID BOTTOM UPON WHICH THE CONTAINER MAY BE INDEPENDENTLY SUPPORTED HERMETICALLY CLOSING ONE END OF THE BODY PORTION AND AN OUTER RIGID TOP COVER HERMETICALLY FIXED TO THE OPPOSITE END OF THE BODY PORTION INCLUDING AN OPENING FOR RECEIVING A CLOSURE AND A VALVE MECHANISM FIXED WITHIN THE OPENING THROUGH WHICH THE MATERIAL IS INTRODUCED AND DISPENSED, A BAG HAVING A SIDE WALL, A CLOSED END AND AN OPEN END WHERE THE CLOSED END AND A PORTION OF THE SIDE WALL ADJACENT THERETO ARE MOVABLE LONGITUDINALLY OF THE BAG, A PORTION OF THE SIDE WALL OF THE BAG ADJACENT THE OPEN END BEING OF SUBSTANTIALLY THE SAME DIAMETER AS THE SAID BODY PORTION AND SLIDABLY RECEIVABLE INTO THE UPPER END OF THE RIGID BODY PORTION AND HERMETICALLY SEALED ABOUT THE UPPER END THEREOF, THE TOP OF THE OUTER CONTAINER HAVING A SKIRT EXTENDING DOWNWARDLY FROM THE UPPER END OF THE BODY PORTION FOR ENGAGING THE OPEN END OF THE BAG FOR MAINTAINING THE OPEN END AND A PORTION OF THE SIDE WALL IN OPEN POSITION, FROM THE INNER EDGE OF THE SKIRT TO THE INNER SURFACE OF THE TOP BEING OF SUBSTANTIALLY THE SAME DISTANCE AS THE DISTANCE FROM THE LOWER EDGE OF THE SKIRT TO THE CLOSED END OF THE BAG, SAID TOP EXTENDING OVER THE ENTIRE UPPER END OF THE BODY PORTION AND AT A HEIGHT AT LEAST AS HIGH AS THE UPPER END OF THE SAID BODY PORTION OF THE CONTAINER, THE INNER SURFACE OF THE TOP BEING OF SUBSTANTIALLY THE SAME FORM AS THE CLOSED END OF THE BAG, THE CLOSED END OF THE BAG AND THE PORTION OF THE SIDE WALL ADJACENT THE CLOSED END BEYOND THE INNER EDGE OF THE EXTENDED SKIRT PORTION OF THE TOP BEING FLEXIBLE AND MOVABLE FROM ITS DOWNWARD POSITION ADJACENT THE BOTTOM OF THE CONTAINER TO AN UPWARDLY EXTENDED POSITION INTO THE TOP AND ALONG THE INNER SURFACE OF THE SKIRT CARRIED BY THE TOP, THE INNER END OF THE DOWNWARDLY EXTENDED PORTION OF THE TOP COVER PROVIDING A FULCRUM ABOUT WHICH THE FLEXIBLE PORTION OF THE BAG IS FOLDED WHEREBY, THE FLEXIBLE WALL AND CLOSED END PORTION OF THE BAG IS ADAPTED TO RECEIVE THE MATERIAL TO BE DISPENSED WHEN IN ITS DOWNWARD POSITION, MEANS PROVIDED FOR AN EXPANDABLE FLUID BETWEEN THE BOTTOM OF THE CONTAINER AND THE OUTER SURFACE OF THE CLOSED END AND ADJACENT FLEXIBLE SIDE WALL OF THE BAG FOR FORCING THE FLEXIBLE PORTION OF THE BAG AND THE MATERIAL THEREIN UPWARDLY TOWARD THE TOP OF THE CONTAINER FOR DISPENSING THE MATERIALS THROUGH THE SAID DISPENSING VALVE MECHANISM.