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) (119) bidirectional rectifier with control electrode (gate) (e.g., triac) (120) six or more semiconductor layers of alternating conductivity types (e.g., npnpnpn structure)

Hierarchy/Derived subclasses

257 / 107

-> 119

-> gate

-> 120

uspto searches

Patent Apps in 257/120

Granted Patents in 257/120

Use the links above or do an advanced search in ppubs for:
(257/120.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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