US Patent 6938800 Automatic dispensing cap for squeezable bottle

The non-vented automatic dispensing cap is generally formed of a body and a retainer cap. The body is threadably secured to a squeezable tube or container. The retainer cap is attached to the body. A pressure chamber is formed between the body and retainer cap. A piston may also form a wall of the pressure chamber. A coil spring or resilient flange holds a valve seated within a dispensing hole extending through the cap. When the tube is squeezed, the product is forced into the pressure chamber expanding the pressure chamber and unseating the valve, thereby allowing product to exit the dispensing opening. Upright, inverted, vented and unvented versions are disclosed.