C07C 7/09
Purification: by fractional condensation
Official title: by fractional condensation
C07C7/09 (Purification: by fractional condensation) appears on 188 US grants and 210 published applications in this corpus.
Search patents in C07C- Granted patents
- 188
- Published applications
- 210
- Assignees
- 111
- Inventors
- 578
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 2 | 0 |
| 1987 | 8 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 2 |
| 2005 | 0 | 2 |
| 2006 | 1 | 2 |
| 2007 | 1 | 2 |
| 2008 | 3 | 2 |
| 2009 | 1 | 3 |
| 2010 | 2 | 5 |
| 2011 | 0 | 3 |
| 2012 | 4 | 1 |
| 2013 | 3 | 6 |
| 2014 | 3 | 3 |
| 2015 | 4 | 10 |
| 2016 | 4 | 9 |
| 2017 | 7 | 10 |
| 2018 | 9 | 23 |
| 2019 | 18 | 15 |
| 2020 | 20 | 19 |
| 2021 | 13 | 25 |
| 2022 | 19 | 11 |
| 2023 | 14 | 15 |
| 2024 | 8 | 14 |
| 2025 | 6 | 21 |
| 2026 | 10 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Molecular sieve composition, its preparation and application thereof9 Jul 2026US 2026/0192289 A1China Petroleum & Chemical Corporation
- Dividing wall column for efficient hydrocarbon separation30 Apr 2026US 2026/0117130 A1Kellogg Brown & Root LLC
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Most cited
By later US patents
- Hydrocarbon gas separation95US 4,519,824 AThe Randall Corporation · 1985
- Method and apparatus for cryogenic fractionation of a gaseous feed86US 4,690,702 ACompagnie Francaise d'Etudes et de Construction "Technip" · 1987
- Process of fractionating gas feeds and apparatus for carrying out the said process85US 4,689,063 ACompagnie Francaise d'Etudes et de Construction "Technip" · 1987
- Method of treating carbon-dioxide-containing natural gas56US 4,441,900 AUnion Carbide Corporation · 1984
- Process for separation of hydrocarbon gases42US 4,710,214 AThe M. W. Kellogg Company · 1987