(under subclass 13.1) Apparatus in which the film follows a zigzag path.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
165+, particularly subclasses 171+ and 178 for apparatus of the gravity-flow type with shelf to shelf or zigzag treated material flow.
122, Liquid Heaters and Vaporizers,
355, for zigzag water tubes.
165, Heat Exchange, 116, for a trickler of the shelf to shelf type of general
utility.
261, Gas and Liquid Contact Apparatus,
127+, for contact fluids heated through the medium of other fluids out of contact therewith, and subclasses 108+ for contact apparatus including stationary baffles over which liquid flows in contact with gases.
