C07D 201/02
Preparation of lactams
C07D201/02 (Preparation of lactams) appears on 341 US grants and 176 published applications in this corpus.
Search patents in C07D- Granted patents
- 341
- Published applications
- 176
- Assignees
- 146
- Inventors
- 688
- Latest grant
- 2 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 4 | 0 |
| 1978 | 5 | 0 |
| 1979 | 6 | 0 |
| 1980 | 3 | 0 |
| 1981 | 8 | 0 |
| 1982 | 6 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 5 | 0 |
| 1988 | 11 | 0 |
| 1989 | 4 | 0 |
| 1990 | 4 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 9 | 0 |
| 1994 | 10 | 0 |
| 1995 | 9 | 0 |
| 1996 | 9 | 0 |
| 1997 | 10 | 0 |
| 1998 | 9 | 0 |
| 1999 | 21 | 0 |
| 2000 | 15 | 0 |
| 2001 | 18 | 1 |
| 2002 | 17 | 9 |
| 2003 | 11 | 16 |
| 2004 | 14 | 17 |
| 2005 | 5 | 6 |
| 2006 | 13 | 5 |
| 2007 | 6 | 5 |
| 2008 | 5 | 3 |
| 2009 | 4 | 5 |
| 2010 | 2 | 8 |
| 2011 | 3 | 11 |
| 2012 | 7 | 3 |
| 2013 | 6 | 8 |
| 2014 | 8 | 8 |
| 2015 | 8 | 5 |
| 2016 | 3 | 7 |
| 2017 | 11 | 7 |
| 2018 | 3 | 6 |
| 2019 | 6 | 7 |
| 2020 | 4 | 3 |
| 2021 | 2 | 5 |
| 2022 | 2 | 7 |
| 2023 | 4 | 3 |
| 2024 | 2 | 3 |
| 2025 | 6 | 15 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process and plant for the production of ε-Caprolactam and ammonium sulfate on industrial scale2 Dec 2025US 12,486,225 B2Cap III B. V.
- 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.
- Process for the recovery of epsilon-caprolactam from nylon 6-containing multi-component material29 Jul 2025US 12,371,407 B2Cap III B. V.
- Method for manufacturing cyclic lactam and device for manufacturing cyclic lactam13 Aug 2026US 2026/0234105 A1Mitsubishi Gas Chemical Company, Inc.
- 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
- High-yield production of epsilon-caprolactam from nylon 6 plastic waste via ammonia-assisted depolymerization11 Dec 2025US 2025/0376442 A1Alliance for Sustainable Energy, LLC
- Method of producing thermoplastic resin11 Sep 2025US 2025/0282925 A1Toray Industries, Inc.
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
- Depolymerization of condensation polymers52US 4,605,762 ACelanese Mexicana S.A. · 1986
- Process to prepare ε-caprolactam51US 6,194,572 B1Dsm N. V. · 2001