C07D 207/28
2-pyrrolidone-5- carboxylic acids
Official title: 2-Pyrrolidone-5- carboxylic acids; Functional derivatives thereof, e.g. esters, nitriles
C07D207/28 (2-pyrrolidone-5- carboxylic acids) appears on 209 US grants and 132 published applications in this corpus.
Search patents in C07D- Granted patents
- 209
- Published applications
- 132
- Assignees
- 139
- Inventors
- 598
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 6 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 5 | 0 |
| 1981 | 5 | 0 |
| 1982 | 6 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 7 | 0 |
| 1987 | 6 | 0 |
| 1988 | 9 | 0 |
| 1989 | 3 | 0 |
| 1990 | 4 | 0 |
| 1991 | 1 | 0 |
| 1992 | 6 | 0 |
| 1993 | 6 | 0 |
| 1994 | 2 | 0 |
| 1995 | 6 | 0 |
| 1996 | 4 | 0 |
| 1997 | 8 | 0 |
| 1998 | 4 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 5 | 0 |
| 2002 | 1 | 2 |
| 2003 | 4 | 6 |
| 2004 | 2 | 5 |
| 2005 | 2 | 5 |
| 2006 | 3 | 5 |
| 2007 | 3 | 5 |
| 2008 | 3 | 8 |
| 2009 | 6 | 2 |
| 2010 | 8 | 9 |
| 2011 | 1 | 8 |
| 2012 | 4 | 3 |
| 2013 | 3 | 3 |
| 2014 | 2 | 9 |
| 2015 | 6 | 6 |
| 2016 | 9 | 4 |
| 2017 | 2 | 8 |
| 2018 | 1 | 8 |
| 2019 | 9 | 6 |
| 2020 | 6 | 6 |
| 2021 | 2 | 4 |
| 2022 | 7 | 7 |
| 2023 | 2 | 7 |
| 2024 | 2 | 0 |
| 2025 | 4 | 4 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Ferroptosis inhibitors—diarylamine para-acetamides25 Aug 2026US 12,715,855 B2Sironax Ltd.
- Methods of preparing chiral benzodiazepinone derivatives23 Dec 2025US 12,503,449 B2Immunome, Inc.
- Benzodiazepine compound, preparation method therefor, and use thereof in medicine18 Nov 2025US 12,473,291 B2West China Hospital, Sichuan University
- Chiral-substituted poly-N-vinylpyrrolidinones and complexes with bimetallic nanoclusters and uses thereof in asymmetric oxidation reactions4 Mar 2025US 12,240,810 B2Kansas State University Research
- Ketamine derivatives and compositions thereof28 Jan 2025US 12,209,060 B2Xwpharma Ltd.
- Beta-lactamase inhibitor intermediate and preparation method therefor18 Jun 2026US 2026/0167640 A1Evopoint Biosciences Co., Ltd.
- Solid forms of fasoracetam15 Jan 2026US 2026/0015336 A1The Children’s Hospital of Philadelphia
- Methods of preparing chiral benzodiazepinone derivatives13 Nov 2025US 2025/0346565 A1Immunome, Inc.
- Crystal form of Vonoprazan pyroglutamate and preparation method therefor26 Jun 2025US 2025/0206716 A1Harway Pharma Co., Ltd
- Fasoracetam crystalline forms24 Apr 2025US 2025/0129043 A1The Children’s Hospital of Philadelphia
Most cited
By later US patents
- Modified tripeptides100US 4,596,819 AWarner-Lambert Company · 1986
- Synthesis of clasto-lactacystin beta-lactone and analogs thereof55US 6,133,308 AMillennium Pharmaceuticals, Inc. · 2000
- Synthesis of clasto-lactacystin β-lactone and analogs thereof54US 6,294,560 B1Millennium Pharmaceuticals, Inc. · 2001
- Synthesis of clasto-lactacystin β-lactone and analogs thereof53US 6,849,743 B2Millennium Pharmaceuticals, Inc. · 2005
- Synthesis of clasto-lactacystin β-lactone and analogs thereof52US 6,794,516 B2Millennium Pharmaceuticals, Inc. · 2004