C07C 273/02
Preparation of urea or its derivatives, i.e. compounds containing any of the
Official title: of urea, its salts, complexes or addition compounds
C07C273/02 (Preparation of urea or its derivatives, i.e. compounds containing any of the) appears on 499 US grants and 443 published applications in this corpus.
Search patents in C07C- Granted patents
- 499
- Published applications
- 443
- Assignees
- 176
- Inventors
- 713
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 13 | 0 |
| 1978 | 14 | 0 |
| 1979 | 5 | 0 |
| 1980 | 9 | 0 |
| 1981 | 7 | 0 |
| 1982 | 10 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 8 | 0 |
| 1986 | 5 | 0 |
| 1987 | 6 | 0 |
| 1988 | 1 | 0 |
| 1989 | 7 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 6 | 0 |
| 1997 | 5 | 0 |
| 1998 | 11 | 0 |
| 1999 | 6 | 0 |
| 2000 | 9 | 0 |
| 2001 | 12 | 4 |
| 2002 | 9 | 9 |
| 2003 | 7 | 5 |
| 2004 | 7 | 6 |
| 2005 | 7 | 5 |
| 2006 | 4 | 5 |
| 2007 | 2 | 5 |
| 2008 | 2 | 9 |
| 2009 | 8 | 11 |
| 2010 | 9 | 10 |
| 2011 | 4 | 10 |
| 2012 | 9 | 14 |
| 2013 | 6 | 8 |
| 2014 | 9 | 19 |
| 2015 | 16 | 21 |
| 2016 | 19 | 29 |
| 2017 | 23 | 29 |
| 2018 | 15 | 26 |
| 2019 | 36 | 33 |
| 2020 | 29 | 33 |
| 2021 | 26 | 26 |
| 2022 | 16 | 28 |
| 2023 | 14 | 22 |
| 2024 | 25 | 29 |
| 2025 | 21 | 27 |
| 2026 | 8 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C07C 273/04From carbon dioxide and ammonia329
- C07C 273/14Separation131
- C07C 273/10Combined with the synthesis of ammonia69
- C07C 273/12Combined with the synthesis of melamine22
- C07C 273/025Of solutions of urea and formaldehyde5
- C07C 273/08From ammoniacal liquor1
- C07C 273/06From cyanamide or calcium cyanamide0
Recent patents
- Reactor for the synthesis of urea14 Jul 2026US 12,679,803 B2Casale SA
- Processes and systems for converting a hydrocarbon-containing feed7 Jul 2026US 12,674,106 B2ExxonMobil Chemical Patents Inc.
- Method to produce a urea ammonium sulphate-based composition23 Jun 2026US 12,662,448 B2Yara International Asa
- System and process for the production of UAN19 May 2026US 12,630,435 B2Stamicarbon B. V.
- Production of urea for diesel exhaust fluid3 Mar 2026US 12,565,622 B2Stamicarbon B. V.
- Method for producing urea, apparatus for producing urea, and method for improving existing apparatus for producing urea10 Sep 2026US 2026/0265183 A1Toyo Engineering Corporation
- Duplex stainless steel and use thereof20 Aug 2026US 2026/0242913 A1Stamicarbon B. V.
- Urea synthesis apparatus, urea synthesis method, and method for improving existing urea synthesis apparatus13 Aug 2026US 2026/0234100 A1Toyo Engineering Corporation
- Method for prilling urea and urea prilling apparatus30 Jul 2026US 2026/0216676 A1Toyo Engineering Corporation
- Urea-producing plant with low carbon dioxide emissions16 Jul 2026US 2026/0200840 A1Yara International Asa
Most cited
By later US patents
- Process for producing methanol292US 4,277,416 AAminoil, USA, Inc. · 1981
- Integrated process for converting hydrocarbon gas to liquids124US 6,248,794 B1Atlantic Richfield Company · 2001
- Apparatus and methods for urea production73US 7,687,041 B2Kellogg Brown & Root LLC · 2010
- Method and apparatus for treating waste streams43US 6,716,360 B2Eau-Viron Incorporated · 2004
- Process for preparing urea42US 6,111,138 ADsm N. V. · 2000