Patent ID: 8337737
Filing Date: 2012-12-25
Classification: A61M,B05C,B29C

Abstract:
1. A method of making a piston for a dispenser adapted to dispense a liquid onto a substrate, comprising: molding a base portion of the piston by injecting a first curable material in a first shot of a molding operation, the base portion including a head portion having a central region and an outer surface and a generally tubular sidewall extending from the head portion to define an outer periphery of the base portion; forming at least one channel in the outer surface of the head portion and extending from the central region to the outer periphery during the first shot of the molding operation; and molding a skirt portion to the outer periphery of the base portion by injecting a second curable material through the at least one channel during a second shot of the molding operation.