USPC Class Details

Description: 540 organic compounds -- part of the class 532-570 series / 540 organic compounds -- part of the class 532-570 series/() organic compounds (class 532, subclass 1) (1) heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., oxygen, sulfur, selenium or tellurium) or nitrogen as the only ring hetero atoms (121) azaporphyrins (122) phthalocyanines (136) halogen bonded directly to ring carbon of the phthalocyanine ring system

Hierarchy/Derived subclasses

540 / 1	-> 121	-> 122	-> 136	-> 137
				-> 138

uspto searches

Patent Apps in 540/136

Granted Patents in 540/136

Use the links above or do an advanced search in ppubs for:
(540/136.ccls. or 540/137.ccls. or 540/138.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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