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by changing the effective cross-section of the working surface of the piston

by changing the effective cross-section of the working surface of the piston · Cooperative Patent Classification (CPC)

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

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CPC classification statistics
Metric	Value
CPC code	F04B49/18
Official title	by changing the effective cross-section of the working surface of the piston
Display label	by changing the effective cross-section of the working surface of the piston
Total patents	7

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

Filing activity over the last five years is growing.

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