USPC Class Details

Description: 331 oscillators / 331 oscillators/(154) electromechanical resonator (158) crystal (159) plural tube

Hierarchy/Derived subclasses

331 / 154-> 158-> 159

uspto searches

Patent Apps in 331/159

Granted Patents in 331/159

Use the links above or do an advanced search in ppubs for:
(331/159.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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