Impregnation followed by a solidification process

Impregnation followed by a solidification process · 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 codeD04H1/645
Official titleImpregnation followed by a solidification process
Display labelImpregnation followed by a solidification process
Total patents95

Filing trend

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

Filing activity over the last five years is growing.

Patents filed per year
YearPatents
20155
20168
20175
20184
20198
20208
20217
20226
202312
202416
202514
20262

Representative patents

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

Frequently asked questions

Answers are generated from the same data shown on this page.

What is CPC D04H1/645?
CPC D04H1/645 is the Cooperative Patent Classification code for “Impregnation followed by a solidification process.”
How many patents are filed under CPC D04H1/645 (Impregnation followed by a solidification process)?
Our database includes 95 publications tagged with this CPC code.
Is patent activity under CPC D04H1/645 growing?
Publication counts under this code: 16 in 2024 vs 14 in 2025 (latest complete years).