.~ By chemical reaction, e.g., ion-exchange, chelating, catalytic, etc.
DEFINITION
Classification: 131/334
By chemical reaction, e.g., ion-exchange, chelating, catalytic, etc.:
(under subclass 331) Product or process wherein separation is effected by a chemical reaction which includes the tobacco smoke.
(1) Note. Examples of chemical reactions which will be found under this subclass are ion-exchange reactions, chelating reactions, catalytic conversions, and oxidation reduction systems, etc.
