Melamine process with purification of melamine offgas
US-2026062392-A1 · Mar 5, 2026 · US
Purification of melamine
Purification of melamine · 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 | C07D251/62 |
| Official title | Purification of melamine |
| Display label | Purification of melamine |
| Total patents | 41 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 2 |
| 2017 | 7 |
| 2018 | 5 |
| 2019 | 4 |
| 2020 | 1 |
| 2021 | 3 |
| 2023 | 4 |
| 2024 | 4 |
| 2025 | 5 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Urea melamine plant with melamine off-gas condenser
US-2026001852-A1 · Jan 1, 2026 · US
Melamine process with a two-stage purification of melamine offgas
US-12391655-B1 · Aug 19, 2025 · US
Melamine process with a two-stage purification of melamine offgas
US-2025250242-A1 · Aug 7, 2025 · US
Production of urea and melamine
US-12338201-B2 · Jun 24, 2025 · US
Process for the synthesis of melamine
US-2025197362-A1 · Jun 19, 2025 · US
Coupled urea melamine plant
US-12319662-B2 · Jun 3, 2025 · US
Coupled urea melamine production with HP CO2 stripping
US-12134590-B2 · Nov 5, 2024 · US
Coupled urea melamine plant
US-2024327358-A1 · Oct 3, 2024 · US
Production of urea and melamine
US-2024270684-A1 · Aug 15, 2024 · US
Coupled urea melamine production with hp co2 stripping
US-2024270685-A1 · Aug 15, 2024 · US
Process for melamine purification
US-11840520-B2 · Dec 12, 2023 · US
Process for melamine purification
US-11834422-B2 · Dec 5, 2023 · US
Materials for organic electroluminescent devices
US-2023295104-A1 · Sep 21, 2023 · US
Combined reactor for high-pressure synthesis of melamine
US-2023014395-A1 · Jan 19, 2023 · US
Process for melamine purification
US-2021332017-A1 · Oct 28, 2021 · US
Process for melamine purification
US-2021332018-A1 · Oct 28, 2021 · US
Process for melamine purification
US-11059793-B2 · Jul 13, 2021 · US
Motor vehicle having a control apparatus for at least one loudspeaker of an exhaust system of the motor vehicle
US-10871093-B2 · Dec 22, 2020 · US
Method for revamping a high pressure melamine plant
US-2019367464-A1 · Dec 5, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C07D251/62?
- CPC C07D251/62 is the Cooperative Patent Classification code for “Purification of melamine.”
- How many patents are filed under CPC C07D251/62 (Purification of melamine)?
- Our database includes 41 publications tagged with this CPC code.
- Is patent activity under CPC C07D251/62 growing?
- Publication counts under this code: 4 in 2024 vs 5 in 2025 (latest complete years).