(under subclass 425) Subject matter using a device designed to determine the hydrogen ion concentration of an electrolyte.
SEE OR SEARCH CLASS
204, Chemistry: Electrical and Wave Energy,
242+, for pH cells, per se.
436, Chemistry: Analytical and Immunological Testing,
1+, for this subject matter involving a chemical reaction, such as, for example, tests in which an electrolytic determination is made subsequent to a chemical reaction.
