(under subclass 150.1) Subject matter wherein the material is moved into the chamber under the influence of negative pressure produced in the chamber.
(1) Note. This subclass does not require substantially the entire volume of the mixing chamber to be exposed to negative pressure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
139, for a mixing chamber, the entire contents of which is exposed to negative pressure, in which the negative pressure may serve to move material into the mixing chamber.
