US Patent 7438704 Open instillation container and method of manufacturing the container

A bottomed conical hollow 6b is formed in a tip end of the container body A formed of a thermoplastic material with a liquid filled and sealed therein simultaneously during the molding process, the hollow having an inside diameter enlarging toward the tip end, and a small-diameter instilling hole 6c is penetrated through the bottom of the hollow 6b for controlling, at a set quantity, the liquid pushed out of the container body A.