C07D 301/32
Separation
Official title: Separation; Purification
C07D301/32 (Separation) appears on 291 US grants and 183 published applications in this corpus.
Search patents in C07D- Granted patents
- 291
- Published applications
- 183
- Assignees
- 144
- Inventors
- 650
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 5 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 5 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 6 | 0 |
| 1991 | 4 | 0 |
| 1992 | 22 | 0 |
| 1993 | 7 | 0 |
| 1994 | 8 | 0 |
| 1995 | 7 | 0 |
| 1996 | 7 | 0 |
| 1997 | 3 | 0 |
| 1998 | 5 | 0 |
| 1999 | 6 | 0 |
| 2000 | 6 | 0 |
| 2001 | 7 | 0 |
| 2002 | 10 | 1 |
| 2003 | 7 | 10 |
| 2004 | 5 | 10 |
| 2005 | 4 | 10 |
| 2006 | 3 | 6 |
| 2007 | 2 | 2 |
| 2008 | 5 | 5 |
| 2009 | 5 | 4 |
| 2010 | 4 | 13 |
| 2011 | 5 | 5 |
| 2012 | 9 | 7 |
| 2013 | 7 | 7 |
| 2014 | 8 | 2 |
| 2015 | 6 | 11 |
| 2016 | 7 | 8 |
| 2017 | 7 | 9 |
| 2018 | 6 | 13 |
| 2019 | 12 | 15 |
| 2020 | 15 | 9 |
| 2021 | 8 | 13 |
| 2022 | 5 | 6 |
| 2023 | 8 | 6 |
| 2024 | 2 | 5 |
| 2025 | 5 | 3 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for increasing propylene oxide output of an integrated process for making propylene oxide and propylene glycol17 Mar 2026US 12,577,218 B2Evonik Operations GmbH
- Epoxy reactive diluent and manufacturing method therefor6 Jan 2026US 12,516,031 B2Korea Kumho Petrochemical Co., Ltd.
- Process for preparing caryophyllene oxide7 Oct 2025US 12,435,053 B2Symrise AG
- Process for removing poly(propylene oxide) from propylene oxide by membrane separation5 Aug 2025US 12,378,212 B2Shell USA, Inc.
- Bio-based epoxy chain extender and preparation method thereof18 Mar 2025US 12,252,476 B2Beijing Technology and Business University
- Simplified ethylene oxide purification methods10 Sep 2026US 2026/0265210 A1Dow Global Technologies LLC
- Clean production method for epoxypropane using the chlorohydrination process with a chlorine close-loop circulation18 Jun 2026US 2026/0167610 A1China University of Petroleum (East China)
- 1,3-propanediol acrylates, diacrylates, monoacrylates, methacrylates, and diglycidyl ether and uses thereof29 Jan 2026US 2026/0028505 A1Primient Covation LLC
- Process for preparing epichlorohydrin by directly oxidizing chloropropene by using liquid-solid circulating fluidized bed reactor25 Dec 2025US 2025/0388556 A1Dalian Institute of Chemical Physics, Chinese Academy of Sciences
- Method for producing cumene, apparatus for producing cumene, and method for producing propylene oxide20 Nov 2025US 2025/0353822 A1Sumitomo Chemical Company, Limited
Most cited
By later US patents
- Process for purifying propylene oxide85US 6,736,941 B2Sumitomo Chemical Company, Limited · 2004
- Epichlorohydrin-based product and process for manufacturing this product54US 6,288,248 B1Solvay (Societe Anonyme) · 2001
- Method for making an oxirane39US 6,350,888 B1Solvay (Societe Anonyme) · 2002
- Kinetic resolution method36US 6,639,087 B2Rhodia Pharma Solutions Inc. · 2003
- Selective hydrogenation of olefinic impurities in epichlorohydrin33US 4,127,594 AShell Oil Company · 1978