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) (109) having only two terminals and no control electrode (gate), e.g., shockley diode

Hierarchy/Derived subclasses

257 / 107	-> 109	-> gate	-> 110
			-> 111
			-> 112

uspto searches

Patent Apps in 257/109

Granted Patents in 257/109

Use the links above or do an advanced search in ppubs for:
(257/109.ccls. or 257/gate.ccls. or 257/110.ccls. or 257/111.ccls. or 257/112.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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