C07C 45/81
By change in the physical state
Official title: by change in the physical state, e.g. crystallisation
C07C45/81 (By change in the physical state) appears on 622 US grants and 366 published applications in this corpus.
Search patents in C07C- Granted patents
- 622
- Published applications
- 366
- Assignees
- 281
- Inventors
- 1,512
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 20 | 0 |
| 1977 | 11 | 0 |
| 1978 | 15 | 0 |
| 1979 | 12 | 0 |
| 1980 | 13 | 0 |
| 1981 | 12 | 0 |
| 1982 | 13 | 0 |
| 1983 | 9 | 0 |
| 1984 | 17 | 0 |
| 1985 | 11 | 0 |
| 1986 | 14 | 0 |
| 1987 | 8 | 0 |
| 1988 | 21 | 0 |
| 1989 | 14 | 0 |
| 1990 | 17 | 0 |
| 1991 | 16 | 0 |
| 1992 | 16 | 0 |
| 1993 | 13 | 0 |
| 1994 | 3 | 0 |
| 1995 | 12 | 0 |
| 1996 | 5 | 0 |
| 1997 | 3 | 0 |
| 1998 | 9 | 0 |
| 1999 | 14 | 0 |
| 2000 | 6 | 0 |
| 2001 | 11 | 0 |
| 2002 | 16 | 12 |
| 2003 | 12 | 6 |
| 2004 | 5 | 10 |
| 2005 | 2 | 11 |
| 2006 | 6 | 12 |
| 2007 | 12 | 6 |
| 2008 | 12 | 5 |
| 2009 | 9 | 14 |
| 2010 | 13 | 16 |
| 2011 | 4 | 12 |
| 2012 | 7 | 8 |
| 2013 | 11 | 11 |
| 2014 | 9 | 9 |
| 2015 | 11 | 18 |
| 2016 | 20 | 25 |
| 2017 | 21 | 25 |
| 2018 | 22 | 14 |
| 2019 | 19 | 22 |
| 2020 | 24 | 25 |
| 2021 | 16 | 18 |
| 2022 | 17 | 21 |
| 2023 | 10 | 14 |
| 2024 | 14 | 26 |
| 2025 | 11 | 10 |
| 2026 | 4 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process for the recovery of low-boiling point components from an ethanol stream7 Jul 2026US 12,674,183 B2Braskem S/A
- Process for hydroformylation with removal of dissolved hydrogen28 Apr 2026US 12,612,351 B2Johnson Matthey Davy Technologies Limited
- Removal of acetals from process streams17 Mar 2026US 12,577,189 B2Celanese International Corporation
- Method for producing fluorenone10 Feb 2026US 12,545,633 B2Mitsubishi Gas Chemical Company, Inc.
- Method for extracting alcohols from an initial mixture comprising alcohols in aqueous phase16 Dec 2025US 12,497,345 B2Ifp Energies Nouvelles
- Method for Producing Odorants and Fragrances on a Thin-Film Evaporator1 Oct 2026US 2026/0297005 A1
- Reduced coenzyme q10 composition and production method for the same1 Oct 2026US 2026/0297008 A1Kaneka Corporation
- Process for the recovery of low-boiling point components from an ethanol stream1 Oct 2026US 2026/0297630 A1Braskem S/A
- Process for the recovery of low-boiling point components from an ethanol stream1 Oct 2026US 2026/0297631 A1Braskem S/A
- Hydroformylation process6 Aug 2026US 2026/0225983 A1Dow Technology Investments LLC
Most cited
By later US patents
- Process for the separation of mixtures of substances103US 3,969,196 AStudiengesellschaft Kohle mbH · 1976
- Transition metal complex catalyzed reactions67US 4,717,775 AUnion Carbide Corporation · 1988
- Process for production of phenol and cyclohexanone58US 4,021,490 APhillips Petroleum Company · 1977
- Transition metal complex catalyzed reactions56US 4,774,361 AUnion Carbide Corporation · 1988
- Baffle tray tower42US 4,543,219 ANippon Kayaku Kabushiki Kaisha · 1985