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Preliminary treatments

Preliminary treatments · Cooperative Patent Classification (CPC)

Textile and paper production, treatment, and products.

Related technology areas

Mapped technology topics for this CPC code.

CPC classification statistics
MetricValue
CPC codeD02J1/221
Official title{Preliminary treatments}
Display labelPreliminary treatments
Total patents7

Filing trend

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

Filing activity over the last five years is stable.

Patents filed per year
YearPatents
20181
20191
20201
20211
20222
20251

Representative patents

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