USPC Class Details

Description: 351 optics: eye examining, vision testing and correcting / 351 optics: eye examining, vision testing and correcting/(200) eye examining or testing instrument (222) subjective type (237) including target image projection (238) tachistoscope type

Hierarchy/Derived subclasses

351 / 200

-> 222

-> 237

-> 238

uspto searches

Patent Apps in 351/238

Granted Patents in 351/238

Use the links above or do an advanced search in ppubs for:
(351/238.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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