USPC Class Details – HistoricIP

Description: 429 chemistry: electrical current producing apparatus, product, and process / 429 chemistry: electrical current producing apparatus, product, and process/(400) fuel cell, subcombination thereof, or method of making or operating (402) metal-gas cell

Hierarchy/Derived subclasses

429 / 400	-> 402	-> 403	-> 404
			-> 405	-> 406
			-> 407

uspto searches

Patent Apps in 429/402

Granted Patents in 429/402

Use the links above or do an advanced search in ppubs for:
(429/402.ccls. or 429/403.ccls. or 429/404.ccls. or 429/405.ccls. or 429/406.ccls. or 429/407.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.