(under subclass 337) Apparatus provided with means to increase the pressure above the fluid in the receptacle.
(1) Note. This subclass requires some additional means to add pressure to the material in the receptacle. The usual "aerosol" can in which the material is already under super atmospheric pressure will be found in subclasses 337 and 372 of this class and the valves therefor in subclass 573.
SEE OR SEARCH THIS CLASS, SUBCLASS:
158, for devices in which there is a gas pump which discharges above the liquid in a container to force the liquid therefrom with, however, a vehicular support therefor.
364+, for devices having a pressure reducer in which means are provided for applying a pressure fluid to the top of a fluid in a receptacle.
