(under subclass 379) Means for projecting fluid jets or streams against the sifting elements for the purpose of clearing or keeping open the sifting passages.
(1) Note. This subclass dose not ordinarily include devices in which the fluid current or jet has an agitating function in the sifting operation with or without incidental clearing of the sifting passages.
(2) Note. The appropriate preceding subclasses involving sifting with liquid treatment and those involving fluid or pneumatic agitation of the material being sifted should be searched.
SEE OR SEARCH CLASS
55, Gas Separation,
294, and 302+ for gas separators combined with pneumatic clearers.
