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 (408) process or means for producing, recycling, or treating reactant, feedstock, product, or electrolyte (413) humidification or dehumidification

Hierarchy/Derived subclasses

429 / 400

-> 408

-> 413

-> 414

uspto searches

Patent Apps in 429/413

Granted Patents in 429/413

Use the links above or do an advanced search in ppubs for:
(429/413.ccls. or 429/414.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.