Canadian Subclass Details

Description: 253 / (1) Lubricants (28) Organic (29) Natural Resin (31) Asphalt, Bitumen, Tar, Pitch

Hierarchy/Derived subclasses

253 / 1

-> 28

-> 29

-> 31

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search just 253/31

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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