USPC Class Details

Description: 420 alloys or metallic compositions / 420 alloys or metallic compositions/(8) ferrous (i.e., iron base) (9) 1.7 percent or more carbon containing (13) 2.7 percent or more carbon equivalent containing (i.e., cast iron)

Hierarchy/Derived subclasses

420 / 8	-> 9	-> 13	-> 14
			-> 15	-> 16	-> 17
			-> 18	-> 19
				-> 20
				-> 21
				-> 22
				-> 23
				-> 24
				-> 25
			-> 26
			-> 27
			-> 28
			-> 29	-> 30
				-> 31
				-> 32
				-> 33

uspto searches

Patent Apps in 420/13

Granted Patents in 420/13

Use the links above or do an advanced search in ppubs for:
(420/13.ccls. or 420/14.ccls. or 420/15.ccls. or 420/16.ccls. or 420/17.ccls. or 420/18.ccls. or 420/19.ccls. or 420/20.ccls. or 420/21.ccls. or 420/22.ccls. or 420/23.ccls. or 420/24.ccls. or 420/25.ccls. or 420/26.ccls. or 420/27.ccls. or 420/28.ccls. or 420/29.ccls. or 420/30.ccls. or 420/31.ccls. or 420/32.ccls. or 420/33.ccls.)

This will show what classes derive from the input. Ex: entering 43/42.24 shows the derived classes and the search that can be used to find patents or patent applications in those subclasses.

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