US PATENT SUBCLASS 34 / 72
.~ With means to treat gas or vapor

Current as of: June, 1999
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34 /   HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS

523  DF  APPARATUS {40}
72.~ With means to treat gas or vapor {3}
73  DF  .~.~> By vapor condensation {4}
79  DF  .~.~> Separation of substances from treating or exhaust gases or vapors {2}
83  DF  .~.~> Jet devices {1}

DEFINITION

Classification: 34/72

(under the class definition) Apparatus coming including means

to treat the gas or vapor which either contacts or is evolved from the solid material undergoing treatment.

(1) Note. When heating of the gas or vapor that contacts the solid is the only treating means the patent is classified with appropriate type of apparatus.

(2) Note. Means to mix treating gases or vapors of the same kind though differing in physical characteristics are placed with the appropriate type of apparatus. If the gases or vapors are recirculated with the addition to or replacement thereof the patents are placed in the various subclasses for recirculation of treating gases or vapors; see (1) Note to subclass 219.

(3) Note. For means for cooling gases or vapors by refrigeration see search notes below.

(4) Note. For other gas or vapor treatment, see the search notes below.

SEE OR SEARCH THIS CLASS, SUBCLASS: 280+, for feather treating. Many of these devices inject steam and also separate dust, etc., from the exhaust gases.

467+, for processes involving treatment of gas or vapor.

524, particularly subclasses 526+, 548, and 557, for automatic control combinations.

SEE OR SEARCH CLASS

62, Refrigeration, appropriate subclasses, for means for cooling gases or vapors by refrigeration.

96, Gas Separation: Apparatus, appropriate subclasses for apparatus for the separation of a gas from a fluid mixture.

110, Furnaces,

119, and indented subclasses; 126, Stoves and Furnaces, subclasses 113 and 280; and 266, Metallurgical Apparatus, subclass 144 and indented subclasses.

165, Heat Exchange, appropriate subclasses for means for cooling gases or vapors by by heat exchange

260, Chemistry of Carbon Compounds, for other gas or vapor treatment.

261, Gas and Liquid Contact Apparatus, appropriate subclasses for gas and liquid contact devices, per se.

312, Supports: Cabinet Structure, 31.01+, for means for cooling gases or vapors by

refrigeration.

422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, for other gas or vapor treatment.

423, Chemistry of Inorganic Compounds, for other gas or vapor treatment.

435, Chemistry: Molecular Biology and Microbiology,

283.1+, for fermentation apparatus, including means to treat gases or vapors; particularly subclass 300.1 for apparatus for trapping output gas; and subclass 301.1 for apparatus for separating foam.

454, Ventilation, appropriate subclasses for gas and liquid contact devices in combination with ventilating systems.