C07C 51/43
By change of the physical state
Official title: by change of the physical state, e.g. crystallisation
C07C51/43 (By change of the physical state) appears on 1,325 US grants and 1,307 published applications in this corpus.
Search patents in C07C- Granted patents
- 1,325
- Published applications
- 1,307
- Assignees
- 576
- Inventors
- 2,977
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 14 | 0 |
| 1977 | 14 | 0 |
| 1978 | 6 | 0 |
| 1979 | 5 | 0 |
| 1980 | 13 | 0 |
| 1981 | 12 | 0 |
| 1982 | 10 | 0 |
| 1983 | 8 | 0 |
| 1984 | 6 | 0 |
| 1985 | 6 | 0 |
| 1986 | 6 | 0 |
| 1987 | 10 | 0 |
| 1988 | 6 | 0 |
| 1989 | 10 | 0 |
| 1990 | 10 | 0 |
| 1991 | 11 | 0 |
| 1992 | 17 | 0 |
| 1993 | 17 | 0 |
| 1994 | 12 | 0 |
| 1995 | 12 | 0 |
| 1996 | 11 | 0 |
| 1997 | 12 | 0 |
| 1998 | 30 | 0 |
| 1999 | 24 | 0 |
| 2000 | 15 | 0 |
| 2001 | 18 | 13 |
| 2002 | 52 | 32 |
| 2003 | 37 | 52 |
| 2004 | 35 | 53 |
| 2005 | 18 | 49 |
| 2006 | 30 | 40 |
| 2007 | 37 | 40 |
| 2008 | 34 | 32 |
| 2009 | 26 | 39 |
| 2010 | 25 | 34 |
| 2011 | 30 | 53 |
| 2012 | 35 | 68 |
| 2013 | 42 | 78 |
| 2014 | 54 | 45 |
| 2015 | 60 | 56 |
| 2016 | 67 | 81 |
| 2017 | 58 | 63 |
| 2018 | 53 | 68 |
| 2019 | 84 | 70 |
| 2020 | 66 | 53 |
| 2021 | 46 | 47 |
| 2022 | 25 | 39 |
| 2023 | 19 | 65 |
| 2024 | 25 | 59 |
| 2025 | 25 | 44 |
| 2026 | 27 | 34 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Purification device22 Sep 2026US 12,741,924 B2Nippon Shokubai Co., Ltd.
- Method for purifying compound8 Sep 2026US 12,729,176 B2Nippon Shokubai Co., Ltd.
- Purification device18 Aug 2026US 12,709,593 B2Nippon Shokubai Co., Ltd.
- Process for working-up a nitrous oxide comprising off-gas stream11 Aug 2026US 12,702,951 B2BASF SE
- 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 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
- Decomposition method for polyester-based resin and decomposition apparatus for polyester-based resin17 Sep 2026US 2026/0275071 A1Nitto Denko Corporation
- Method for obtaining organic acids from an aqueous mother liquor10 Sep 2026US 2026/0265175 A1Covestro Deutschland AG
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