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)/(107) regenerative type switching device (e.g., scr, comfet, thyristor) (163) emitter region feature (164) multi-emitter region (e.g., emitter geometry or emitter ballast resistor)

Hierarchy/Derived subclasses

257 / 107	-> 163	-> 164	-> 165
			-> 166

uspto searches

Patent Apps in 257/164

Granted Patents in 257/164

Use the links above or do an advanced search in ppubs for:
(257/164.ccls. or 257/165.ccls. or 257/166.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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