Description: 321 / (1) Frequency Conversion (F1 To F2)

Hierarchy/Derived subclasses

321 / 1-> 2
 -> 3-> 4
 -> 5
 -> 6
 -> 7-> 8
 -> 9-> 10
  -> 11

CIPO searches

search just 321/1

- or -

search hierarchy!

The "search hierarchy!" link will execute this search:
((321/1 <IN> CPC) <OR> (321/2 <IN> CPC) <OR> (321/3 <IN> CPC) <OR> (321/4 <IN> CPC) <OR> (321/5 <IN> CPC) <OR> (321/6 <IN> CPC) <OR> (321/7 <IN> CPC) <OR> (321/8 <IN> CPC) <OR> (321/9 <IN> CPC) <OR> (321/10 <IN> CPC) <OR> (321/11 <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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