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Pumps with vents to vent inverted containers and refill units having non-collapsing containers

  • US 9,648,992 B2
  • Filed: 11/21/2014
  • Issued: 05/16/2017
  • Est. Priority Date: 12/19/2013
  • Status: Active Grant
First Claim
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1. A refill unit comprising:

  • a non-collapsing container;

    a foam pump;

    the foam pump having a compressible air chamber;

    a passage between the interior of the compressible air chamber and the interior of the container; and

    a regulating valve regulating flow from the interior of the compressible air chamber to the interior of the container;

    wherein pressure in the compressible air chamber causes the regulating valve to prevent air from passing from the interior of the compressible air chamber to the interior of the container.

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