C07C 37/68
Purification
Official title: Purification; separation; Use of additives, e.g. for stabilisation {(C07C37/004 and C07C37/005 take precedence)}
C07C37/68 (Purification) appears on 846 US grants and 565 published applications in this corpus.
Search patents in C07C- Granted patents
- 846
- Published applications
- 565
- Assignees
- 375
- Inventors
- 1,937
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 23 | 0 |
| 1977 | 17 | 0 |
| 1978 | 19 | 0 |
| 1979 | 21 | 0 |
| 1980 | 22 | 0 |
| 1981 | 34 | 0 |
| 1982 | 26 | 0 |
| 1983 | 22 | 0 |
| 1984 | 22 | 0 |
| 1985 | 18 | 0 |
| 1986 | 7 | 0 |
| 1987 | 7 | 0 |
| 1988 | 5 | 0 |
| 1989 | 13 | 0 |
| 1990 | 14 | 0 |
| 1991 | 10 | 0 |
| 1992 | 17 | 0 |
| 1993 | 17 | 0 |
| 1994 | 22 | 0 |
| 1995 | 19 | 0 |
| 1996 | 11 | 0 |
| 1997 | 10 | 0 |
| 1998 | 14 | 0 |
| 1999 | 10 | 0 |
| 2000 | 10 | 0 |
| 2001 | 12 | 2 |
| 2002 | 12 | 12 |
| 2003 | 17 | 17 |
| 2004 | 16 | 15 |
| 2005 | 12 | 17 |
| 2006 | 16 | 13 |
| 2007 | 8 | 5 |
| 2008 | 3 | 11 |
| 2009 | 8 | 10 |
| 2010 | 7 | 13 |
| 2011 | 6 | 10 |
| 2012 | 10 | 13 |
| 2013 | 11 | 13 |
| 2014 | 11 | 14 |
| 2015 | 17 | 28 |
| 2016 | 22 | 28 |
| 2017 | 17 | 25 |
| 2018 | 24 | 28 |
| 2019 | 26 | 38 |
| 2020 | 45 | 46 |
| 2021 | 41 | 43 |
| 2022 | 23 | 54 |
| 2023 | 24 | 41 |
| 2024 | 17 | 28 |
| 2025 | 15 | 31 |
| 2026 | 16 | 10 |
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
- Process configuration for a single phenol purification train for production of phenol and bisphenol-A in an integrated process25 Aug 2026US 12,715,830 B2Sabic Global Technologies B.V.
- Industrial extraction method of cannabidiol11 Aug 2026US 12,703,672 B2Chenguang Biotech Group Co., Ltd.
- Contaminant removal from coal tar-derived crude phenols28 Jul 2026US 12,692,216 B2China Petroleum & Chemical Corporation
- Monomer composition for synthesizing recycled plastic, preparation method thereof, recycled plastic, and molded product using the same28 Jul 2026US 12,692,358 B2LG Chem.Ltd.
- Method of purifying cannabinoid components from plant extracts10 Sep 2026US 2026/0265167 A1
- Monomer composition for synthesising recycled plastic, preparation method thereof, recycled plastic, and molded product using the same10 Sep 2026US 2026/0265483 A1LG Chem.Ltd.
- Alkyl bisphenol composition and method for preparing the same2 Jul 2026US 2026/0184658 A1Industrial Technology Research Institute
- Methods of making and using 1-methyleffusol11 Jun 2026US 2026/0159465 A1
- Process for the purification of cannabidiol from herbal material30 Apr 2026US 2026/0115212 A1A2W Pharma Limited
Most cited
By later US patents
- Distillation process for recovery of high purity phenol78US 5,064,507 AAllied-Signal Inc. · 1991
- Process for production of phenol and cyclohexanone58US 4,021,490 APhillips Petroleum Company · 1977
- Preparation of bisphenols50US 4,191,843 AShell Oil Company · 1980
- Selective sorption by zeolites40US 4,309,281 AMobil Oil Corporation · 1982
- Cannabinoid extraction process and system39US 9,987,567 B1Nextleaf Solutions Ltd. · 2018