.~.~ By changing ambient pressure on material surface, e.g., suction
DEFINITION
Classification: 266/239
(under subclass 236) Device wherein the means for discharging material from the treating vessel includes means for varying gas pressure at a selected location on the exterior of the molten mass to create a gas pressure gradient across the exterior which is effective to deliver material from the vessel.
(1) Note. The means to vary the gas pressure on a portion of a liquid surface includes both devices that raise the gas pressure, e.g., pressurized gas cylinders, and that lower the gas pressure, e.g., vacuum pumps.
SEE OR SEARCH CLASS
222, Dispensing, appropriate subclass, for miscellaneous receptacles having means to effect discharge of fluent material therefrom. Note especially
394+, for fluid pressure means and subclass 416 for siphon means.
