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by changing the form of the inner or outer contour of the working chamber

by changing the form of the inner or outer contour of the working chamber · Cooperative Patent Classification (CPC)

Engines, pumps, lighting, heating, and mechanical systems.

Related technology areas

Mapped technology topics for this CPC code.

CPC classification statistics
Metric	Value
CPC code	F04C28/20
Official title	by changing the form of the inner or outer contour of the working chamber
Display label	by changing the form of the inner or outer contour of the working chamber
Total patents	10

Year-over-year patent counts classified under this CPC code.

Filing activity over the last five years is stable.

Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.