Process for colouring a thermoplastic polymer
US-12448520-B2 · Oct 21, 2025 · US
Other azo dyes prepared by diazotising and coupling · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C09B39/00 |
| Official title | Other azo dyes prepared by diazotising and coupling |
| Display label | Other azo dyes prepared by diazotising and coupling |
| Total patents | 5 |
Year-over-year patent counts classified under this CPC code.
Filing activity appears to be declining based on the most recent years.
| Year | Patents |
|---|---|
| 2017 | 1 |
| 2020 | 1 |
| 2023 | 2 |
| 2025 | 1 |
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
US-12448520-B2 · Oct 21, 2025 · US
US-2023295438-A1 · Sep 21, 2023 · US
US-2023203313-A1 · Jun 29, 2023 · US
US-10683456-B2 · Jun 16, 2020 · US
US-2017306237-A1 · Oct 26, 2017 · US