Patent ID: 8052915

Claim:
A method of forming a fluid vessel comprising the steps of; providing a pattern die having a first finish forming cavity and a die cavity formed therein; providing a mandrel disposed in the pattern die and adapted to receive an extruded parison formed from a moldable material; providing a boss, wherein the boss is disposed in the first finish forming cavity prior to forming a container in the pattern die; providing a support slidably disposed in the pattern die and adapted to support the weight of the parison as it is extruded through said pattern die; positioning the mandrel and parison in the die cavity, wherein the parison is extruded onto the support; slidably removing the support from the die cavity at the same rate of extrusion of the parison until the parison is disposed through the die cavity; causing a fluid to flow through the parison and pattern die to expand the parison to form the container having the shape of the die cavity of the pattern die and to form an airtight seal between the container and the boss; removing the container from the pattern die; and providing an outer layer on an outer surface of the container.