C07C 51/44
By distillation
Official title: by distillation
C07C51/44 (By distillation) appears on 791 US grants and 770 published applications in this corpus.
Search patents in C07C- Granted patents
- 791
- Published applications
- 770
- Assignees
- 301
- Inventors
- 1,596
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 7 | 0 |
| 1978 | 6 | 0 |
| 1979 | 3 | 0 |
| 1980 | 11 | 0 |
| 1981 | 5 | 0 |
| 1982 | 5 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 5 | 0 |
| 1987 | 6 | 0 |
| 1988 | 3 | 0 |
| 1989 | 9 | 0 |
| 1990 | 7 | 0 |
| 1991 | 5 | 0 |
| 1992 | 8 | 0 |
| 1993 | 13 | 0 |
| 1994 | 7 | 0 |
| 1995 | 5 | 0 |
| 1996 | 3 | 0 |
| 1997 | 7 | 0 |
| 1998 | 12 | 0 |
| 1999 | 15 | 0 |
| 2000 | 6 | 0 |
| 2001 | 8 | 8 |
| 2002 | 23 | 13 |
| 2003 | 17 | 35 |
| 2004 | 25 | 34 |
| 2005 | 11 | 30 |
| 2006 | 20 | 21 |
| 2007 | 22 | 23 |
| 2008 | 24 | 16 |
| 2009 | 16 | 23 |
| 2010 | 10 | 19 |
| 2011 | 20 | 41 |
| 2012 | 18 | 39 |
| 2013 | 28 | 58 |
| 2014 | 33 | 29 |
| 2015 | 40 | 28 |
| 2016 | 42 | 58 |
| 2017 | 39 | 41 |
| 2018 | 39 | 34 |
| 2019 | 55 | 42 |
| 2020 | 45 | 33 |
| 2021 | 25 | 24 |
| 2022 | 11 | 16 |
| 2023 | 12 | 38 |
| 2024 | 14 | 25 |
| 2025 | 13 | 27 |
| 2026 | 13 | 15 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Production of acrolein or acrylic acid from iso-propanol with high yeild and low cost14 Jul 2026US 12,679,795 B2Rohm and Haas Company
- Methods for removal of sulfur dioxide (SO2) from trifluoroacetyl chloride (TFAC)14 Jul 2026US 12,679,800 B2Solstice Advanced Materials US, Inc.
- Acetic acid manufacturing method19 May 2026US 12,630,494 B2Kellogg Brown & Root LLC
- Removal of aldehydes in acetic acid production12 May 2026US 12,623,991 B2LyondellBasell Acetyls, LLC
- Production and purification of acetic acid14 Apr 2026US 12,600,692 B2Celanese International Corporation
- Methods for production of butyric acid1 Oct 2026US 2026/0297011 A1
- Process for producing biobased a,b-unsaturated carboxylic acids from poly(3-hydroxyalkanoate)24 Sep 2026US 2026/0285797 A1Arkema France
- Method for recovering heavy by-products from the manufacture of acrylic acid17 Sep 2026US 2026/0274781 A1Arkema France
- A method and a plant for purifying lactic acid16 Jul 2026US 2026/0200824 A1Sulzer Management AG
- Acetonitrile compositions and methods of making the same16 Jul 2026US 2026/0200835 A1Nitto Denko Corporation
Most cited
By later US patents
- Methods for recovering acrylic acid353US 6,252,110 B1Nippon Shokubai Co., Ltd. · 2001
- Removal of permanganate reducing compounds and alkyl iodides from a carbonylation process stream197US 6,143,930 ACelanese International Corporation · 2000
- Method to produce highly pure eicosapentaenoic acid or its ester176US 5,840,944 ANippon Suisan Kaisha, Ltd. · 1998
- Method of purifying eicosapentaenoic acid and its esters173US 4,377,526 ANippon Suisan Kaisha, Ltd. · 1983
- Method of purifying eicosapentaenoic acid or the ester derivative thereof by fractional distillation156US 5,215,630 AKansai Chemical Engineering Co., Ltd. · 1993