Pigmented and fluorescent compounds derived from the addition of a primary or secondary amine to an aldehyde
US-12590209-B2 · Mar 31, 2026 · US
containing six-membered aromatic rings
containing six-membered aromatic rings · 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 | C07C251/16 |
| Official title | containing six-membered aromatic rings |
| Display label | containing six-membered aromatic rings |
| Total patents | 32 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 4 |
| 2017 | 6 |
| 2018 | 4 |
| 2020 | 5 |
| 2021 | 3 |
| 2022 | 3 |
| 2023 | 2 |
| 2025 | 1 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Photoresponsive compound, adhesive, switching material, and toner containing the photoresponsive compound, and image forming method using the toner
US-12398095-B2 · Aug 26, 2025 · US
Method for producing amino acid aminoalkyl ester or inorganic acid salt thereof
US-11827586-B2 · Nov 28, 2023 · US
Syntheses of N-heterocyclic carbenes and intermediates therefor
US-11572348-B2 · Feb 7, 2023 · US
Pigmented and fluorescent compounds derived from the addition of a primary or secondary amine to an aldehyde
US-2022289981-A1 · Sep 15, 2022 · US
Amidine substituted benzoyl derivatives useful as herbicides
US-11272709-B2 · Mar 15, 2022 · US
Photoresponsive compound, adhesive, switching material, and toner containing the photoresponsive compound, and image forming method using the toner
US-2022064107-A1 · Mar 3, 2022 · US
Syntheses of n-heterocyclic carbenes and intermediates therefor
US-2021317088-A9 · Oct 14, 2021 · US
Method for producing amino acid aminoalkyl ester or inorganic acid salt thereof
US-2021253517-A1 · Aug 19, 2021 · US
Imine-type quaternary ammonium salt catalyst, preparation method thereof and use thereof for preparation of polyisocyanate composition
US-11059772-B2 · Jul 13, 2021 · US
Imine-type quaternary ammonium salt catalyst, preparation method thereof and use thereof for preparation of polyisocyanate composition
US-2020377445-A1 · Dec 3, 2020 · US
Syntheses of n-heterocyclic carbenes and intermediates therefor
US-2020354323-A1 · Nov 12, 2020 · US
Amidine Substituted Benzoyl Derivatives Useful As Herbicides
US-2020345009-A1 · Nov 5, 2020 · US
Syntheses of N-heterocyclic carbenes and intermediates therefor
US-10759763-B2 · Sep 1, 2020 · US
Liquid crystal display and manufacturing method thereof
US-10527890-B2 · Jan 7, 2020 · US
Syntheses of n-heterocyclic carbenes and intermediates therefor
US-2018186754-A1 · Jul 5, 2018 · US
Ketene imine compound, polyester film, back sheet for solar cell module, and solar cell module
US-10005722-B2 · Jun 26, 2018 · US
Process for the preparation of 4-amino-5-fluoro-3-chloro-6-(substituted)picolinates
US-9981911-B2 · May 29, 2018 · US
Syntheses of N-heterocyclic carbenes and intermediates therefor
US-9890125-B2 · Feb 13, 2018 · US
Process for the preparation of 4-amino-5-fluoro-3-chloro-6-(substituted)picolinates
US-2017349549-A1 · Dec 7, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07C251/16?
- CPC C07C251/16 is the Cooperative Patent Classification code for “containing six-membered aromatic rings.”
- How many patents are filed under CPC C07C251/16 (containing six-membered aromatic rings)?
- Our database includes 32 publications tagged with this CPC code.
- Is patent activity under CPC C07C251/16 growing?
- Publication counts under this code: 2 in 2023 vs 1 in 2025 (latest complete years).