A61K 31/397
Having four-membered rings
Official title: having four-membered rings, e.g. azetidine
A61K31/397 (Having four-membered rings) appears on 774 US grants and 1,496 published applications in this corpus.
Search patents in A61K- Granted patents
- 774
- Published applications
- 1,496
- Assignees
- 601
- Inventors
- 3,161
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 2 |
| 2002 | 3 | 14 |
| 2003 | 9 | 25 |
| 2004 | 5 | 32 |
| 2005 | 5 | 38 |
| 2006 | 14 | 29 |
| 2007 | 18 | 38 |
| 2008 | 10 | 44 |
| 2009 | 9 | 42 |
| 2010 | 20 | 41 |
| 2011 | 14 | 38 |
| 2012 | 22 | 56 |
| 2013 | 40 | 63 |
| 2014 | 41 | 71 |
| 2015 | 50 | 79 |
| 2016 | 41 | 73 |
| 2017 | 78 | 100 |
| 2018 | 53 | 84 |
| 2019 | 72 | 82 |
| 2020 | 48 | 94 |
| 2021 | 50 | 78 |
| 2022 | 40 | 81 |
| 2023 | 43 | 68 |
| 2024 | 31 | 69 |
| 2025 | 39 | 92 |
| 2026 | 16 | 63 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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Most cited
By later US patents
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