Description: 321 / (1) Frequency Conversion (F1 To F2)
Hierarchy/Derived subclasses
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.