C07C 51/573
Separation
Official title: Separation; Purification; Stabilisation; Use of additives
C07C51/573 (Separation) appears on 198 US grants and 46 published applications in this corpus.
Search patents in C07C- Granted patents
- 198
- Published applications
- 46
- Assignees
- 86
- Inventors
- 382
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 7 | 0 |
| 1978 | 4 | 0 |
| 1979 | 3 | 0 |
| 1980 | 7 | 0 |
| 1981 | 9 | 0 |
| 1982 | 7 | 0 |
| 1983 | 4 | 0 |
| 1984 | 7 | 0 |
| 1985 | 6 | 0 |
| 1986 | 9 | 0 |
| 1987 | 8 | 0 |
| 1988 | 6 | 0 |
| 1989 | 2 | 0 |
| 1990 | 10 | 0 |
| 1991 | 9 | 0 |
| 1992 | 8 | 0 |
| 1993 | 9 | 0 |
| 1994 | 5 | 0 |
| 1995 | 2 | 0 |
| 1996 | 6 | 0 |
| 1997 | 5 | 0 |
| 1998 | 3 | 0 |
| 1999 | 5 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 1 |
| 2002 | 1 | 3 |
| 2003 | 6 | 3 |
| 2004 | 2 | 2 |
| 2005 | 1 | 0 |
| 2006 | 2 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 2 |
| 2009 | 2 | 3 |
| 2010 | 1 | 3 |
| 2011 | 0 | 2 |
| 2012 | 2 | 1 |
| 2013 | 3 | 1 |
| 2014 | 3 | 3 |
| 2015 | 1 | 2 |
| 2016 | 2 | 4 |
| 2017 | 2 | 3 |
| 2018 | 2 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 1 |
| 2021 | 4 | 4 |
| 2022 | 2 | 2 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 2 | 1 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Integrated process for generating acid anhydrides26 May 2026US 12,637,405 B2Cleantech Building Materials PLC
- Process for distillative purification of unsaturated carboxylic anhydrides25 Nov 2025US 12,479,789 B2Evonik Operations GmbH
- Synthesis and purification of CBDA20 May 2025US 12,304,885 B2The Regents of the University of Colorado, a body corporate
- Methods and systems for separating compounds24 Oct 2023US 11,794,127 B2Sustainable Energy Solutions, LLC
- Process for the preparation of halogenated carboxylic anhydrides16 Aug 2022US 11,414,369 B2Solvay SA
- Integrated process for generating acid anhydrides10 Sep 2026US 2026/0265171 A1Cleantech Building Materials PLC
- Integrated process for generating acid anhydrides18 Jun 2026US 2026/0167596 A1Cleantech Building Materials PLC
- Recovery of maleic anhydride19 Mar 2026US 2026/0078101 A1Huntsman Petrochemical Corporation
- Synthesis and purification of cbda10 Apr 2025US 2025/0115542 A1The Regents of the University of Colorado, a body corporate
- Integrated process for generating acid anhydrides24 Nov 2022US 2022/0371983 A1Hyconix, Inc.
Most cited
By later US patents
- Formation, purification and recovery of phthalic anhydride253US 4,215,051 AStandard Oil Company (Indiana) · 1980
- Removal of organic iodine compounds from carbonylation products of methanol methyl acetate and dimethyl ether44US 4,908,477 ABASF SE · 1990
- Method for refining acetic anhydride by distillation31US 5,264,087 AEastman Kodak Company · 1993
- Process for purifying and recovering contaminated catalyst solution obtained in the carbonylation of methyl acetate and/or dimethylether29US 4,556,644 AHoechst Aktiengesellschaft · 1985
- Iodide removal process25US 5,220,058 AUnion Carbide Chemicals & Plastics Technology Corporation · 1993