(under subclass 12.1) Methods and apparatus for separating and segregating into grades components of solid mixtures having like characteristics, which employ both free suspension in gas and sifting.
(1) Note. Either may precede the other or the operations may be simultaneous.
(2) Note. This subclass and those indented thereunder are composed mainly of patents relating to the separation of grains, flour, and minerals, but are not restricted thereto.
(3) Note. Search this class, subclasses 12 and 19 for the combinations, and the subclasses indented thereunder and under Sifting (subclass 233) for subcombinations. Where the recovery of material carried by the gas is involved, search should be made in Class 96, Gas Separation: Apparatus, as well as in the deposition subclasses indented under Gaseous suspension and sifting (subclass 21), and Fluid Suspension (subclass 133), in this class.
SEE OR SEARCH THIS CLASS, SUBCLASS:
19, for a combination including gaseous suspension and sifting.
133+, for particulars of gaseous suspension separators. 233+, for particulars of sifters.
SEE OR SEARCH CLASS
96, Gas Separation: Apparatus, for gas separation apparatus. See (3) Note above.
99, Foods and Beverages: Apparatus,
518+, for grain hullers and scourers combined with gas separating means.
241, Solid Material Comminution or Disintegration,
49+, for comminutors in which material suspended in a gas stream is conveyed to a separating screen.
