US Patent 11479391 Vented spout for a liquid storage container

The spout includes a first member and a second member. The first member includes an elongated and generally tubular first main body having at least two longitudinally extending internal passageways, one being an air duct and the other being a liquid duct. The air duct ends with at least one constricted opening through which the air circuit exits the air duct. A valve is provided at the rear end of the first main body and is made integral therewith. The valve engages a valve seat provided at the rear end of an inner conduit positioned inside the second member and in which a rear section of the first main body is slidingly movable. The spout may be provided with a child-resistant closure (CRC) device.