C07C 273/16
Separation
Official title: Separation; Purification
C07C273/16 (Separation) appears on 105 US grants and 110 published applications in this corpus.
Search patents in C07C- Granted patents
- 105
- Published applications
- 110
- Assignees
- 53
- Inventors
- 196
- Latest grant
- 3 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 1 |
| 2010 | 0 | 2 |
| 2011 | 1 | 2 |
| 2012 | 1 | 3 |
| 2013 | 0 | 1 |
| 2014 | 2 | 2 |
| 2015 | 1 | 3 |
| 2016 | 4 | 5 |
| 2017 | 4 | 7 |
| 2018 | 2 | 6 |
| 2019 | 8 | 17 |
| 2020 | 14 | 12 |
| 2021 | 9 | 6 |
| 2022 | 7 | 8 |
| 2023 | 4 | 6 |
| 2024 | 10 | 13 |
| 2025 | 8 | 7 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Production of urea for diesel exhaust fluid3 Mar 2026US 12,565,622 B2Stamicarbon B. V.
- Urea production with reduced urea losses13 Jan 2026US 12,522,563 B2Stamicarbon B. V.
- Process for producing low-biuret urea21 Oct 2025US 12,448,350 B2Casale SA
- Method for producing solid urea by granulation2 Sep 2025US 12,403,436 B2Casale SA
- Production of urea and melamine24 Jun 2025US 12,338,201 B2Stamicarbon B. V.
- Urea-producing plant with low carbon dioxide emissions16 Jul 2026US 2026/0200840 A1Yara International Asa
- Process to produce a melt of urea and biuret and system to produce such a melt2 Jul 2026US 2026/0184674 A1Yara International Asa
- Urea-solution efflorescence dissolving additive and its manufacturing method14 May 2026US 2026/0132102 A1
- 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.
Most cited
By later US patents
- Method and apparatus for recovering condensables in vapor from a urea vacuum evaporator14US 5,744,009 AThe M. W. Kellogg Company · 1998
- Process for producing granules14US 5,779,945 ADsm N. V. · 1998
- Method of selectively removing biuret from urea and compositions for use therein11US 4,345,099 AUnion Oil Company of California · 1982
- Methods of isolating urea, urea compositions and methods for producing the same10US 6,506,305 B2Snow Brand Milk Products Co., Ltd. · 2003
- Process for the purification of urea solutions containing biuret and the like9US 4,231,960 AOMV Aktiengesellschaft · 1980