USPC Class Details

Description: 420 alloys or metallic compositions / 420 alloys or metallic compositions/(8) ferrous (i.e., iron base) (87) over 0.05 percent sulfur, over 0.04 percent phosphorus or sulfur or phosphorus added in any amount to promote machinability

Hierarchy/Derived subclasses

420 / 8

-> 87

-> 88

uspto searches

Patent Apps in 420/87

Granted Patents in 420/87

Use the links above or do an advanced search in ppubs for:
(420/87.ccls. or 420/88.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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