(under subclass 1) Subject matter wherein the mixture is a gas at standard temperature and pressure.
SEE OR SEARCH CLASS
48, Gas: Heating and Illuminating, appropriate subclasses for such compositions containing other than merely hydrocarbons.
252, Compositions, for gaseous compositions containing other than merely hydrocarbons, especially
182.11, for chemically reactive gas compositions; subclasses 372+ for gas compositions in general; and subclass 571 for gaseous dielectric compositions.
