C07C 51/42
Separation
Official title: Separation; Purification; Stabilisation; Use of additives
C07C51/42 (Separation) appears on 2,763 US grants and 2,239 published applications in this corpus.
Search patents in C07C- Granted patents
- 2,763
- Published applications
- 2,239
- Assignees
- 1,100
- Inventors
- 5,919
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 51 | 0 |
| 1977 | 35 | 0 |
| 1978 | 25 | 0 |
| 1979 | 22 | 0 |
| 1980 | 43 | 0 |
| 1981 | 51 | 0 |
| 1982 | 32 | 0 |
| 1983 | 29 | 0 |
| 1984 | 31 | 0 |
| 1985 | 36 | 0 |
| 1986 | 33 | 0 |
| 1987 | 30 | 0 |
| 1988 | 26 | 0 |
| 1989 | 37 | 0 |
| 1990 | 49 | 0 |
| 1991 | 38 | 0 |
| 1992 | 43 | 0 |
| 1993 | 70 | 0 |
| 1994 | 44 | 0 |
| 1995 | 35 | 0 |
| 1996 | 37 | 0 |
| 1997 | 36 | 0 |
| 1998 | 67 | 0 |
| 1999 | 54 | 0 |
| 2000 | 51 | 0 |
| 2001 | 59 | 18 |
| 2002 | 93 | 61 |
| 2003 | 67 | 85 |
| 2004 | 55 | 87 |
| 2005 | 33 | 86 |
| 2006 | 57 | 77 |
| 2007 | 60 | 74 |
| 2008 | 64 | 71 |
| 2009 | 45 | 81 |
| 2010 | 47 | 63 |
| 2011 | 67 | 91 |
| 2012 | 63 | 111 |
| 2013 | 66 | 141 |
| 2014 | 104 | 93 |
| 2015 | 103 | 104 |
| 2016 | 114 | 126 |
| 2017 | 89 | 97 |
| 2018 | 83 | 101 |
| 2019 | 107 | 99 |
| 2020 | 96 | 85 |
| 2021 | 79 | 75 |
| 2022 | 44 | 76 |
| 2023 | 39 | 104 |
| 2024 | 44 | 102 |
| 2025 | 40 | 72 |
| 2026 | 40 | 59 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Catalytic and continuous thermochemical process of production of valuable derivatives from organic materials and/or waste6 Oct 2026US 12,753,141 B2Instituto Superior Tecnico
- Purification device22 Sep 2026US 12,741,924 B2Nippon Shokubai Co., Ltd.
- Method for purifying compound8 Sep 2026US 12,729,176 B2Nippon Shokubai Co., Ltd.
- Container and process for the storage of a saturated aliphatic C6-C12 carboxylic acid25 Aug 2026US 12,715,683 B2BASF SE
- Purification device18 Aug 2026US 12,709,593 B2Nippon Shokubai Co., Ltd.
- Storage and/or transport of ethylenically unsaturated carboxylic acids8 Oct 2026US 2026/0308099 A1BASF SE
- 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
- Method for separating depolymerization product17 Sep 2026US 2026/0274782 A1Honda Motor Co., Ltd.
Most cited
By later US patents
- Methods for recovering acrylic acid353US 6,252,110 B1Nippon Shokubai Co., Ltd. · 2001
- Low energy carbonylation process242US 6,657,078 B2Celanese International Corporation · 2003
- Removal of permanganate reducing compounds and alkyl iodides from a carbonylation process stream197US 6,143,930 ACelanese International Corporation · 2000
- Combined fatty acid composition for treatment or prophylaxis of thrombo-embolic conditions196US 4,526,902 ACentury Laboratories, Inc. · 1985
- Method to produce highly pure eicosapentaenoic acid or its ester176US 5,840,944 ANippon Suisan Kaisha, Ltd. · 1998