Description: 321 / (12) Current Conversion (E.G. Rectification, Derectification) (34) D.C. to A.C. Conversion (e.g., Derectification, Inverter) (41) Semiconductor Type Converter (42) S.C.R. Type Converter (51) With Pulse Responsive or Pulse Generating Means

Hierarchy/Derived subclasses

321 / 12-> 34-> 41-> 42-> 51-> 52
     -> 53

CIPO searches

search just 321/51

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search hierarchy!

The "search hierarchy!" link will execute this search:
((321/51 <IN> CPC) <OR> (321/52 <IN> CPC) <OR> (321/53 <IN> CPC))

This will show what classes derive from the input. Ex: entering 78/35 shows the derived classes and the search that can be used to find patents in those subclasses.
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