USPC Class Details

Description: 257 active solid-state devices (e.g., transistors, solid-state diodes) / 257 active solid-state devices (e.g., transistors, solid-state diodes)/(213) field effect device (215) charge transfer device (245) structure for applying electric field into device (e.g., resistive electrode, acoustic traveling wave in channel) (249) electrode structures or materials

Hierarchy/Derived subclasses

257 / 213

-> 215

-> 245

-> 249

-> 250

uspto searches

Patent Apps in 257/249

Granted Patents in 257/249

Use the links above or do an advanced search in ppubs for:
(257/249.ccls. or 257/250.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.

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