C07D 251/62
Purification of melamine
C07D251/62 (Purification of melamine) appears on 52 US grants and 49 published applications in this corpus.
Search patents in C07D- Granted patents
- 52
- Published applications
- 49
- Assignees
- 26
- Inventors
- 95
- Latest grant
- 24 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 3 | 2 |
| 2003 | 2 | 4 |
| 2004 | 4 | 2 |
| 2005 | 3 | 3 |
| 2006 | 2 | 1 |
| 2007 | 2 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 4 |
| 2010 | 2 | 2 |
| 2011 | 0 | 2 |
| 2012 | 2 | 1 |
| 2013 | 0 | 2 |
| 2014 | 1 | 0 |
| 2015 | 4 | 0 |
| 2016 | 0 | 2 |
| 2017 | 4 | 3 |
| 2018 | 3 | 2 |
| 2019 | 1 | 3 |
| 2020 | 2 | 1 |
| 2021 | 1 | 2 |
| 2022 | 0 | 0 |
| 2023 | 2 | 2 |
| 2024 | 1 | 4 |
| 2025 | 2 | 2 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Production of urea and melamine24 Jun 2025US 12,338,201 B2Stamicarbon B. V.
- Coupled urea melamine plant3 Jun 2025US 12,319,662 B2Stamicarbon B. V.
- Coupled urea melamine production with HP CO2 stripping5 Nov 2024US 12,134,590 B2Stamicarbon B. V.
- Process for melamine purification12 Dec 2023US 11,840,520 B2Casale SA
- Process for melamine purification5 Dec 2023US 11,834,422 B2Casale SA
- Process for the synthesis of melamine with an optimized dissolution and ammonolysis step8 Oct 2026US 2026/0308133 A1Eurotecnica Contractors & Engineers S.p.A.
- Melamine process with purification of melamine offgas5 Mar 2026US 2026/0062392 A1Casale SA
- Urea melamine plant with melamine off-gas condenser1 Jan 2026US 2026/0001852 A1Stamicarbon B. V.
- Process for the synthesis of melamine19 Jun 2025US 2025/0197362 A1Casale SA
- Process for the production of melamine27 Mar 2025US 2025/0100978 A1Proman AG
Most cited
By later US patents
- Process for the production of highly pure melamine20US 5,721,363 AAgrolinz Melamin GmbH · 1998
- Method for increasing purity of melamine10US 5,514,797 AMelamine Chemicals, Inc. · 1996
- Process for the preparation of melamine8US 4,433,146 AStamicarbon B. V. · 1984
- Method for producing melem-free melamine and quenching agents8US 7,176,309 B2Ami Agrolinz Melamine International GmbH · 2007
- Method for producing pure melamine7US 6,790,956 B1Agrolinz Melamin GmbH · 2004