Bubbles

Subclass of:

209 - Classifying, separating, and assorting solids

209132000 - FLUID SUSPENSION

209155000 - Liquid

209162000 - Floating

209163000 - Buoyant material

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application number	Description	Number of patent applications / Date published
209164000	Processes	82
209168000	Apparatus	8