A61K 51/044
Having nitrogen as a ring hetero atom
Official title: {having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins (rifampin A61K51/0459)}
A61K51/044 (Having nitrogen as a ring hetero atom) appears on 880 US grants and 1,424 published applications in this corpus.
Search patents in A61K- Granted patents
- 880
- Published applications
- 1,424
- Assignees
- 575
- Inventors
- 2,794
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 4 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 3 | 0 |
| 1989 | 6 | 0 |
| 1990 | 3 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 8 | 0 |
| 1995 | 6 | 0 |
| 1996 | 6 | 0 |
| 1997 | 6 | 0 |
| 1998 | 9 | 0 |
| 1999 | 14 | 0 |
| 2000 | 14 | 0 |
| 2001 | 11 | 5 |
| 2002 | 17 | 16 |
| 2003 | 17 | 30 |
| 2004 | 10 | 27 |
| 2005 | 18 | 24 |
| 2006 | 11 | 25 |
| 2007 | 8 | 24 |
| 2008 | 20 | 31 |
| 2009 | 9 | 47 |
| 2010 | 17 | 56 |
| 2011 | 19 | 52 |
| 2012 | 29 | 51 |
| 2013 | 43 | 72 |
| 2014 | 42 | 82 |
| 2015 | 47 | 72 |
| 2016 | 36 | 77 |
| 2017 | 56 | 65 |
| 2018 | 54 | 66 |
| 2019 | 51 | 71 |
| 2020 | 50 | 74 |
| 2021 | 53 | 75 |
| 2022 | 29 | 87 |
| 2023 | 30 | 57 |
| 2024 | 42 | 85 |
| 2025 | 23 | 87 |
| 2026 | 41 | 66 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- A61K 51/0455Having six-membered rings with one nitrogen as the only ring hetero atom364
- A61K 51/0459Having six-membered rings with two nitrogen atoms as the only ring hetero302
- A61K 51/0453Having five-membered rings with two or more ring hetero atoms, at least204
- A61K 51/0446Having five-membered rings with one nitrogen as the only ring hetero atom158
- A61K 51/0463Having six-membered rings with at least one nitrogen and one oxygen as48
- A61K 51/0468Having seven-membered rings48
- A61K 51/0465Having six-membered rings with at least one nitrogen and one sulfur as15
- A61K 51/0461Having six-membered rings with three nitrogens as the only ring hetero atoms12
All 10 subgroupsShow fewer
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Most cited
By later US patents
- Glycine receptor antagonists and the use thereof159US 5,514,680 AState of Oregon, acting by and through the Oregon State Board of Higher Education, acting for and on behalf of the Oregon Health Sciences University · 1996
- Vitamin-targeted imaging agents155US 7,128,893 B2Endocyte, Inc. · 2006
- Composition and method for tumor imaging123US 5,688,488 APurdue Research Foundation · 1997
- Radiolabeled farnesyl-protein transferase inhibitors111US 6,060,038 AMerck & Co., Inc. · 2000
- Androgenic directed compositions95US 5,656,651 ABiophysica, Inc. · 1997