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Barrels which have undergone surface treatment, e.g. phosphating {(F41A21/44 takes precedence)}

Barrels which have undergone surface treatment, e.g. phosphating {(F41A21/44 takes precedence)} · 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	F41A21/22
Official title	Barrels which have undergone surface treatment, e.g. phosphating {(F41A21/44 takes precedence)}
Display label	Barrels which have undergone surface treatment, e.g. phosphating {(F41A21/44 takes precedence)}
Total patents	8

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

Filing activity appears to be declining based on the most recent years.

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