USPC Class Details – HistoricIP

Description: 60 power plants / 60 power plants/(272) internal combustion engine with treatment or handling of exhaust gas (282) by means producing a chemical reaction of a component of the exhaust gas (304) oxidizer feed passage at engine exhaust valve, manifold or port

Hierarchy/Derived subclasses

60 / 272	-> 282	-> 304	-> 305
			-> 306

uspto searches

Patent Apps in 60/304

Granted Patents in 60/304

Use the links above or do an advanced search in ppubs for:
(60/304.ccls. or 60/305.ccls. or 60/306.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.