(under the class definition) Apparatus including means to seal an opening in a treating chamber against gas or vapor leakage inwardly or outwardly and providing for the feeding of material through the opening.
(1) Note. This subclass includes only enough of the chamber structure to cooperate with the seal. Where other housing or
treating is claimed, the patents are elsewhere appropriately classified. This applies to a chamber acting as a seal or air lock only. For other plural chambers or compartments which may have seals therebetween, see this class, subclasses 209+.
(2) Note. See this class, subclass 231 and notes for deflecting baffles causing a definite gas or vapor flow.
(3) Note. Complete the search in this class, subclass 92 and see notes. Such subclass includes vacuum treating chambers including feeders and chamber seals.
SEE OR SEARCH CLASS
198, Conveyors: Power-Driven, 860.3+,.
202, Distillation: Apparatus,
269,.
221, Dispensing,
106, and 108, for rotary trap chamber feeders.
277, Seal for a Joint or Juncture, for a generic sealing means or process.
396, Photography,
579, for the use of a gaseous fluid treating apparatus in photography.
414, Material or Article Handling,
217+, for apparatus for moving material between zones having different pressures and inhibiting a change in the pressure gradient there between.
432, Heating,
242, for a closure or seal for the work entrance passage of a heating furnace. 454, Ventilation,
188+, for the use of a protective air current which seals an opening against gas or vapor leakage therethrough.
