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 (427) characterized by control or measuring means or method

Hierarchy/Derived subclasses

429 / 400

-> 408

-> 427

uspto searches

Patent Apps in 429/427

Granted Patents in 429/427

Use the links above or do an advanced search in ppubs for:
(429/427.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.