C07D 201/00
Preparation, separation, purification or stabilisation of unsubstituted lactams
C07D201/00 (Preparation, separation, purification or stabilisation of unsubstituted lactams) appears on 475 US grants and 249 published applications in this corpus.
Search patents in C07D- Granted patents
- 475
- Published applications
- 249
- Assignees
- 200
- Inventors
- 968
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 21 | 0 |
| 1977 | 15 | 0 |
| 1978 | 7 | 0 |
| 1979 | 17 | 0 |
| 1980 | 6 | 0 |
| 1981 | 13 | 0 |
| 1982 | 12 | 0 |
| 1983 | 4 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 8 | 0 |
| 1987 | 6 | 0 |
| 1988 | 14 | 0 |
| 1989 | 8 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 11 | 0 |
| 1994 | 12 | 0 |
| 1995 | 11 | 0 |
| 1996 | 13 | 0 |
| 1997 | 11 | 0 |
| 1998 | 9 | 0 |
| 1999 | 23 | 0 |
| 2000 | 17 | 0 |
| 2001 | 20 | 1 |
| 2002 | 21 | 13 |
| 2003 | 14 | 21 |
| 2004 | 18 | 18 |
| 2005 | 7 | 9 |
| 2006 | 14 | 8 |
| 2007 | 7 | 6 |
| 2008 | 6 | 5 |
| 2009 | 6 | 7 |
| 2010 | 3 | 12 |
| 2011 | 3 | 15 |
| 2012 | 8 | 6 |
| 2013 | 9 | 10 |
| 2014 | 10 | 11 |
| 2015 | 10 | 6 |
| 2016 | 3 | 9 |
| 2017 | 13 | 9 |
| 2018 | 4 | 6 |
| 2019 | 7 | 12 |
| 2020 | 7 | 7 |
| 2021 | 5 | 9 |
| 2022 | 5 | 11 |
| 2023 | 4 | 7 |
| 2024 | 3 | 7 |
| 2025 | 9 | 18 |
| 2026 | 4 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Purification method for laurolactam6 Oct 2026US 12,753,280 B2Hanwha Solutions Corporation
- Artificially synthesized sphingosine derivative lipoid monomer and use of same for delivering nucleic acid19 May 2026US 12,629,421 B2Beijing Baishihekang Pharmaceutical Technology (Bsjpharma) Co., Ltd
- 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.
- Bisanthracene derivatives having solubilizing substituent, and organic electroluminescence device using same10 Feb 2026US 12,545,650 B2LG Chem.Ltd.
- Process and plant for the production of ε-Caprolactam and ammonium sulfate on industrial scale2 Dec 2025US 12,486,225 B2Cap III B. V.
- Method for manufacturing cyclic lactam and device for manufacturing cyclic lactam13 Aug 2026US 2026/0234105 A1Mitsubishi Gas Chemical Company, Inc.
- Artificially synthesized sphingosine derivative lipoid monomer and use of same for delivering nucleic acid6 Aug 2026US 2026/0224704 A1Beijing Baishihekang Pharmaceutical Technology (Bsjpharma) Co., Ltd
- Hierarchical porous all-silica molecular sieve and its preparation method and application25 Jun 2026US 2026/0175205 A1China Petroleum & Chemical Corporation
- Titanium silicalite molecular sieve with hierarchical porous structure and its preparation and application18 Jun 2026US 2026/0166536 A1China Petroleum & Chemical Corporation
- Polyoxyalkylene-1,2-dimyristoyl-glycerol compounds, wherein the polyoxyalkylene is a poly(ethylene oxide) having c1 to c3-alkyloxymethyl side chains16 Apr 2026US 2026/0102345 A1Evonik Operations GmbH
Most cited
By later US patents
- Preparation of 5-membered ring heterocycles70US 5,453,516 ABASF SE · 1995
- Reclaiming .epsilon.-caprolactam from nylon 6 carpet62US 5,169,870 ABASF SE · 1992
- Process for the preparation of epsilon-caprolactam and epsilon-caprolactam precursors54US 5,700,934 ADsm N. V. · 1997
- Removal of light impurities from caprolactam by distillation with water53US 4,767,503 AAllied Corporation · 1988
- Depolymerization of condensation polymers52US 4,605,762 ACelanese Mexicana S.A. · 1986