C07D 201/16
Separation or purification
C07D201/16 (Separation or purification) appears on 131 US grants and 65 published applications in this corpus.
Search patents in C07D- Granted patents
- 131
- Published applications
- 65
- Assignees
- 54
- Inventors
- 294
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 10 | 0 |
| 1978 | 2 | 0 |
| 1979 | 10 | 0 |
| 1980 | 3 | 0 |
| 1981 | 5 | 0 |
| 1982 | 5 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 4 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 5 | 0 |
| 2002 | 4 | 4 |
| 2003 | 3 | 8 |
| 2004 | 5 | 2 |
| 2005 | 3 | 4 |
| 2006 | 2 | 4 |
| 2007 | 2 | 1 |
| 2008 | 2 | 3 |
| 2009 | 2 | 2 |
| 2010 | 1 | 1 |
| 2011 | 0 | 4 |
| 2012 | 2 | 1 |
| 2013 | 3 | 3 |
| 2014 | 1 | 2 |
| 2015 | 1 | 0 |
| 2016 | 0 | 3 |
| 2017 | 1 | 1 |
| 2018 | 3 | 1 |
| 2019 | 0 | 1 |
| 2020 | 1 | 0 |
| 2021 | 1 | 2 |
| 2022 | 1 | 1 |
| 2023 | 0 | 2 |
| 2024 | 0 | 4 |
| 2025 | 5 | 11 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Purification method for laurolactam6 Oct 2026US 12,753,280 B2Hanwha Solutions Corporation
- Compositions and methods for removal of n-methyl-2-pyrrolidone (NMP) degradation products and other foulants from NMP purification systems14 Apr 2026US 12,600,697 B2Refined Technologies, Inc.
- Process for the recovery of epsilon-caprolactam from nylon 6-containing multi-component material18 Nov 2025US 12,473,255 B2HSCC Sustainable Venturing B.V.
- Process for the recovery of epsilon-caprolactam from polyamide 6 comprising fishing nets28 Oct 2025US 12,454,508 B2Cap III B. V.
- Process for the recovery of epsilon-caprolactam from nylon 6 comprising fishing nets7 Oct 2025US 12,435,041 B2Cap III B. V.
- Method of producing thermoplastic resin11 Sep 2025US 2025/0282925 A1Toray Industries, Inc.
- Process for the recovery of epsilon-caprolactam from nylon 6-containing multi-component material21 Aug 2025US 2025/0263369 A1Cap III B. V.
- Method of collecting e-caprolactam and polyamide 6 oligomer, and method of producing polyamide 614 Aug 2025US 2025/0257037 A1Toray Industries, Inc.
- Method for recovering cation component of ionic liquid and method for regenerating ionic liquid8 May 2025US 2025/0145567 A1Nisshinbo Holdings Inc.
- Process for the recovery of epsilon-caprolactam from polyamide 6 comprising fishing nets1 May 2025US 2025/0136547 A1Cap III B. V.
Most cited
By later US patents
- Removal of light impurities from caprolactam by distillation with water53US 4,767,503 AAllied Corporation · 1988
- Method of recovering caprolactam from mixed waste37US 5,241,066 ABASF SE · 1993
- Continuous process for the recovery of caprolactam23US 4,107,160 AZimmer, Inc. · 1978
- Process for continuous purification of crude caprolactam prepared from 6-aminocapronitrile21US 5,496,941 ABASF SE · 1996
- Hydrogenation catalyst and its preparation19US 6,368,996 B1China Petroleum Corporation · 2002