US PATENT SUBCLASS 34 / 448
.~.~.~ Vapor or gas treatment

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

282  DF  PROCESS {24}
443  DF  .~ Gas or vapor contact with treated material {17}
444  DF  .~.~ Sheet, web, or strand {7}
448.~.~.~ Vapor or gas treatment {2}
449  DF  .~.~.~.~> Condensation of gas or vapor
450  DF  .~.~.~.~> Combustion of gas or vapor

DEFINITION

Classification: 34/448

Vapor or gas treatment:

(under subclass 444) Process having any one or a combination of (a) the use of gases having different degrees of vapor concentration; (b) changing or maintaining constant the vapor concentration by adding or removing gases or vapors; (c) adding any characteristic of material to or removing any characteristic of material from the treating gas or vapor.