Patent ID: 8640897
Filing Date: 2014-02-04
Classification: A61J

Abstract:
1. A teat for a feeding bottle having a one-way valve located remotely from the nipple of the teat to allow air to enter the feeding bottle to replace liquid sucked out of the bottle through the nipple while preventing liquid from leaking from the bottle, wherein the one-way valve comprises an inwardly-oriented depression having opposed mutually inclined flexible side walls meeting at a ridge having a slit, each of said flexible side walls having an inner surface exposed to pressure within the feeding bottle, an outer surface exposed to ambient air pressure outside the feeding bottle and a thickness measured between said inner surface and said outer surface of less than 0.4 mm, wherein the pressure on the inner surfaces of said flexible side walls is equal to the pressure on said outer surfaces, said inner surfaces and said outer surfaces of two said flexible side walls are flat and make line contact with one another at the slit, when the pressure on the inner surfaces of said flexible side walls is less than the pressure on said outer surfaces, said flexible side walls separate for opening the slit and allowing ambient air to enter the feeding bottle, and when the pressure on said inner surfaces of said flexible side walls is greater than the pressure on said outer surfaces, said flexible side walls collapse against one another, said outer surfaces of said flexible side walls making sealing contact with one another along an interface surface that spreads away from the ridge with increasing pressure on said inner surfaces of said flexible side walls.