(under subclass 212) Processes wherein a bed or mass of particles are maintained in a state of fluidized suspension by passing a gas or vapor in a generally upward direction through the particles.
(1) Note. Coating material may be introduced directly into the mass of fluidized particles or along with the fluidizing gas or vapor.
(2) Note. The particles usually are coated while in the fluidizing gas or vapor but may be coated before entry or after exit therefrom.
