Patent ID: 8708320

Claim:
A bubbler for storing a volatile liquid chemical and delivering vapor of the volatile liquid chemical to a vapor deposition process when under vacuum, the bubbler comprising a cylindrical inside wall having a diameter, a floor, a diptube inlet ending in an outlet proximate the floor and at least one baffle disc affixed to an upper end of the diptube and positioned between the outlet of the diptube and an outlet of the bubbler, wherein the at least one baffle disc has a circumferential edge and a diameter slightly less than the diameter of the inside wall such that the space between the circumferential edge of the baffle disc and the cylindrical inside wall is sufficient to allow the vapor of the volatile liquid to pass through the space with minimum pressure drop, but sufficiently narrow to minimize the passage of liquid that may be ejected from a volatile liquid content under vacuum conditions and high flow rates of a carrier gas through the diptube, wherein the at least one baffle disc is solid and has a concave downward shape to collect condensed volatile liquid chemical for return by coalesced droplets that fall back into the stored volatile liquid chemical, wherein in operation under vacuum conditions, the bubbler is capable of preventing liquid droplets from entering the outlet of the bubbler.