USPC Class Details

Description: 277 seal for a joint or juncture / 277 seal for a joint or juncture/(345) seal between relatively movable parts (i.e., dynamic seal) (434) piston ring or piston ring expander or seat therefor (436) piston ring having peripheral radially sealing flexible projection (e.g., piston cup, etc.) (438) having c, u, or v cross-sectional profile

Hierarchy/Derived subclasses

277 / 345-> 434-> 436-> 438-> 439

uspto searches

Patent Apps in 277/438

Granted Patents in 277/438

Use the links above or do an advanced search in ppubs for:
(277/438.ccls. or 277/439.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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