Method of Coloring Hair with Washfast Yellow Imidazolium Direct Dye Compounds
US-2018078477-A1 · Mar 22, 2018 · US
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having one nitrogen atom as the only ring hetero atom
having one nitrogen atom as the only ring hetero atom · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C09B44/12 |
| Official title | having one nitrogen atom as the only ring hetero atom |
| Display label | having one nitrogen atom as the only ring hetero atom |
| Total patents | 2 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Not enough yearly data to assess filing trend yet.
| Year | Patents |
|---|---|
| 2018 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.