(under subclass 592) Process for manufacturing an article which utilizes a substance that alters the velocity of a chemical reaction and which substance may be recovered essentially unaltered in form and amount at the end of the reaction.
(1) Note. A recited chemical reaction, per se, will generally bar original placement in this subclass.
(2) Note. Prior to the establishment of this subclass (890), this subject matter was indented under "Gas and Water Device Making" (old 29/157+). Other subclasses under Class 29 subclasses 592+ have not been screened for this subject matter.
SEE OR SEARCH THIS CLASS, SUBCLASS:
890.08, for a method of making a muffler, manifold or exhaust pipe.
