Pumping and floating pistons coated with a barrier layer
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United States of America Patent
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Issued Date -
May 31, 2007
app pub date -
Sep 9, 2004
filing date -
Sep 11, 2003
priority date (Note) -
Abandoned
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Abstract
Pumping and floating pistons (70) suitable for a hand pump (10) for a viscous fluid material such as a toothpaste, made of a plastics material coated with a barrier layer (75). A preferred barrier layer is a thermoplastic elastomer. The barrier layer of the pumping piston may be integrally formed into a one way outlet valve. The barrier layer reduces leakage of components of the fluid material out through the piston, or ingress of environmental components through the piston.
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