USPC Class Details – HistoricIP

Description: 44 fuel and related compositions / 44 fuel and related compositions/(300) liquid fuels (excluding fuels that are exclusively mixtures of liquid hydrocarbons) (323) containing -x-n(=x) or -x-n(=x)(=x) bonded directly to carbon, wherein the x's are the same or diverse chalcogens (e.g., thionitrite esters, etc.)

Hierarchy/Derived subclasses

44 / 300	-> 323	-> 324	-> 325
			-> 326

uspto searches

Patent Apps in 44/323

Granted Patents in 44/323

Use the links above or do an advanced search in ppubs for:
(44/323.ccls. or 44/324.ccls. or 44/325.ccls. or 44/326.ccls.)

This will show what classes derive from the input. Ex: entering 43/42.24 shows the derived classes and the search that can be used to find patents or patent applications in those subclasses.