Description: 122 / (18) Regulation (27) Combustion
Hierarchy/Derived subclasses
CIPO searches
search just 122/27- or -
search hierarchy!
The "search hierarchy!" link will execute this search:
((122/27 <IN> CPC) <OR> (122/28 <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.