USPC Class Details

Description: 91 motors: expansible chamber type / 91 motors: expansible chamber type/(472) three or more cylinders arranged in parallel radial or conical relationship with rotary transmission axis (499) cylinders parallel to rotation axis (502) including plural axially spaced working chambers (e.g., double-acting working members, etc.)

Hierarchy/Derived subclasses

91 / 472

-> 499

-> 502

uspto searches

Patent Apps in 91/502

Granted Patents in 91/502

Use the links above or do an advanced search in ppubs for:
(91/502.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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