with layers graded in composition or in physical properties

with layers graded in composition or in physical properties · Cooperative Patent Classification (CPC)

Chemical and metallurgical processes, compounds, and materials.

Related technology areas

Mapped technology topics for this CPC code.

CPC classification statistics
MetricValue
CPC codeC23C28/325
Official title{with layers graded in composition or in physical properties}
Display labelwith layers graded in composition or in physical properties
Total patents74

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
20158
20164
20179
20183
20193
20206
20216
20225
20236
202414
20258
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 C23C28/325?
CPC C23C28/325 is the Cooperative Patent Classification code for “with layers graded in composition or in physical properties.”
How many patents are filed under CPC C23C28/325 (with layers graded in composition or in physical properties)?
Our database includes 74 publications tagged with this CPC code.
Is patent activity under CPC C23C28/325 growing?
Publication counts under this code: 14 in 2024 vs 8 in 2025 (latest complete years).