C07C 7/04
Purification: by distillation
Official title: by distillation
C07C7/04 (Purification: by distillation) appears on 1,223 US grants and 1,108 published applications in this corpus.
Search patents in C07C- Granted patents
- 1,223
- Published applications
- 1,108
- Assignees
- 341
- Inventors
- 2,590
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 18 | 0 |
| 1977 | 12 | 0 |
| 1978 | 15 | 0 |
| 1979 | 14 | 0 |
| 1980 | 11 | 0 |
| 1981 | 18 | 0 |
| 1982 | 12 | 0 |
| 1983 | 16 | 0 |
| 1984 | 19 | 0 |
| 1985 | 19 | 0 |
| 1986 | 18 | 0 |
| 1987 | 19 | 0 |
| 1988 | 13 | 0 |
| 1989 | 13 | 0 |
| 1990 | 16 | 0 |
| 1991 | 9 | 0 |
| 1992 | 16 | 0 |
| 1993 | 13 | 0 |
| 1994 | 7 | 0 |
| 1995 | 26 | 0 |
| 1996 | 10 | 0 |
| 1997 | 7 | 0 |
| 1998 | 7 | 0 |
| 1999 | 14 | 0 |
| 2000 | 7 | 0 |
| 2001 | 8 | 1 |
| 2002 | 9 | 17 |
| 2003 | 14 | 25 |
| 2004 | 11 | 27 |
| 2005 | 15 | 19 |
| 2006 | 16 | 18 |
| 2007 | 14 | 14 |
| 2008 | 13 | 16 |
| 2009 | 11 | 19 |
| 2010 | 16 | 23 |
| 2011 | 17 | 18 |
| 2012 | 11 | 28 |
| 2013 | 28 | 43 |
| 2014 | 30 | 50 |
| 2015 | 38 | 69 |
| 2016 | 39 | 54 |
| 2017 | 52 | 69 |
| 2018 | 64 | 66 |
| 2019 | 84 | 85 |
| 2020 | 81 | 67 |
| 2021 | 60 | 74 |
| 2022 | 75 | 75 |
| 2023 | 46 | 53 |
| 2024 | 50 | 65 |
| 2025 | 54 | 65 |
| 2026 | 18 | 48 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Heat integration via heat pump on bottom dividing wall column6 Oct 2026US 12,752,216 B2Sulzer Management AG
- α-olefin extractant and method for separating an alkane and an α-olefin6 Oct 2026US 12,753,133 B2Inner Mongolia Yitai Coal-based New Materials Research Institute Co., Ltd.
- Method for purifying a feedstock resulting from a method for depolymerizing styrene compounds11 Aug 2026US 12,703,670 B2Compagnie Generale Des Etablissements Michelin
- Dehydrogenation and pyrolysis product recovery with a common C3 splitter4 Aug 2026US 12,698,247 B2Uop LLC
- Integrated stabilizer in deisobutanizer for isomerization of hydrocarbons and product separation4 Aug 2026US RE50,978 E1Kellogg Brown & Root LLC
- Systems and methods for using facilitated transport membranes to separate olefins and paraffins8 Oct 2026US 2026/0308087 A1
- Process for the preparation of polyisobutene from olefins from isobutanol obtained from mixed guerbet reaction of ethanol and methanol8 Oct 2026US 2026/0308287 A1BASF SE
- Process for purifying hydrocarbon streams including heterogeneously and homogeneously catalysed reactions3 Sep 2026US 2026/0257976 A1Evonik Oxeno GmbH
- Methods for optimization of distillation column for reduction of energy consumption27 Aug 2026US 2026/0249208 A1Sabic Global Technologies B.V.
- Recovery of styrene monomer from polystyrene27 Aug 2026US 2026/0250218 A1
Most cited
By later US patents
- Distillative separations of gas mixtures containing methane, carbon dioxide and other components129US 4,462,814 AKoch Process Systems, Inc. · 1984
- Separating hydrocarbon gases114US 4,617,039 APro-Quip Corporation · 1986
- Cryogenic distillative separation of acid gases from methane111US 4,318,723 AKoch Process Systems, Inc. · 1982
- Hydrocarbon gas processing99US 4,889,545 AElcor Corporation · 1989
- Process for separating hydrocarbon gas constituents96US 4,687,499 AMcDermott International, Inc. · 1987