(under the class definition) Processes in which a workpiece or molding material is subjected to treatment with an applied gas or vapor, which gas or vapor reacts chemically with at least the surface of the workpiece.
(1) Note. Processes in which steam generated by heating wet concrete would not bring a patent here. To be placed in this
subclass steam or vapor must be added from an external source or be created from water other than that in the concrete.
SEE OR SEARCH THIS CLASS, SUBCLASS:
85, for processes utilizing an inert gaseous atmosphere.
232, for processes including subsequent disparate treatment of article after working, shaping or molding.
333, for mere heating of hydraulic inorganic settable materials. 340+, for treatment, per se, of shaped or solid articles.
643, for processes directed to firing, sintering or vitrifying of shaped articles or preforms with coating by vapor contacting said body after firing.
646+, for processes of utilizing a chemically reactive atmosphere other than air, per se, during sintering to convert precursor to ceramic material.
674+, for processes involving specified composition of heating atmosphere, other than air.
SEE OR SEARCH CLASS
106, Compositions: Coating or Plastic, appropriate subclasses for reactive steam treatment of inorganic materials when combined with a broadly recited molding step.
427, Coating Processes,
248.1+, for processes of coating with a vapor, gas, or smoke.
