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 (287) condition responsive control of reactor feed, pressure, or by-pass (291) of or by pressure in reactor or of engine exhaust

Hierarchy/Derived subclasses

60 / 272	-> 282	-> 287	-> 291	-> 292
				-> 293

uspto searches

Patent Apps in 60/291

Granted Patents in 60/291

Use the links above or do an advanced search in ppubs for:
(60/291.ccls. or 60/292.ccls. or 60/293.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.