Description: 126 / (15) Enclosed Combustion Chamber (16) Jacketed (17) With Intermediate Heat Transfer Fluid (18) Distribution Type (e.g., Hot Air Furnace) (20) Forced Circulation

Hierarchy/Derived subclasses

126 / 15	-> 16	-> 17	-> 18	-> 20	-> 21
					-> 22

CIPO searches

search just 126/20

- or -

search hierarchy!

The "search hierarchy!" link will execute this search:
((126/20 <IN> CPC) <OR> (126/21 <IN> CPC) <OR> (126/22 <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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