A61K 31/395
Having nitrogen as a ring hetero atom
Official title: having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
A61K31/395 (Having nitrogen as a ring hetero atom) appears on 71,425 US grants and 123,946 published applications in this corpus.
Search patents in A61K- Granted patents
- 71,425
- Published applications
- 123,946
- Assignees
- 21,995
- Inventors
- 155,078
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 306 | 0 |
| 1977 | 224 | 0 |
| 1978 | 176 | 0 |
| 1979 | 121 | 0 |
| 1980 | 153 | 0 |
| 1981 | 169 | 0 |
| 1982 | 124 | 0 |
| 1983 | 139 | 0 |
| 1984 | 169 | 0 |
| 1985 | 152 | 0 |
| 1986 | 172 | 0 |
| 1987 | 209 | 0 |
| 1988 | 246 | 0 |
| 1989 | 329 | 0 |
| 1990 | 371 | 0 |
| 1991 | 343 | 0 |
| 1992 | 354 | 0 |
| 1993 | 439 | 0 |
| 1994 | 348 | 0 |
| 1995 | 453 | 0 |
| 1996 | 634 | 0 |
| 1997 | 847 | 0 |
| 1998 | 855 | 0 |
| 1999 | 997 | 0 |
| 2000 | 971 | 0 |
| 2001 | 1156 | 455 |
| 2002 | 1269 | 1858 |
| 2003 | 1193 | 2716 |
| 2004 | 881 | 3256 |
| 2005 | 837 | 3240 |
| 2006 | 1015 | 3269 |
| 2007 | 809 | 3081 |
| 2008 | 794 | 3166 |
| 2009 | 860 | 3374 |
| 2010 | 1285 | 3945 |
| 2011 | 1383 | 3961 |
| 2012 | 1753 | 3984 |
| 2013 | 2559 | 4941 |
| 2014 | 3291 | 6123 |
| 2015 | 3834 | 6375 |
| 2016 | 3902 | 6426 |
| 2017 | 4357 | 6515 |
| 2018 | 4071 | 6196 |
| 2019 | 4176 | 6441 |
| 2020 | 4072 | 6623 |
| 2021 | 3749 | 6535 |
| 2022 | 3364 | 6525 |
| 2023 | 2993 | 6465 |
| 2024 | 3076 | 6830 |
| 2025 | 3170 | 6584 |
| 2026 | 2275 | 5062 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- A61K 31/435Having six-membered rings with one nitrogen as the only ring hetero atom36,659
- A61K 31/495Having six-membered rings with two or more nitrogen atoms as the only29,130
- A61K 31/41Having five-membered rings with two or more ring hetero atoms, at least18,275
- A61K 31/40Having five-membered rings with one nitrogen as the only ring hetero atom12,444
- A61K 31/535Having six-membered rings with at least one nitrogen and one oxygen as9,790
- A61K 31/55Having seven-membered rings6,908
- A61K 31/54Having six-membered rings with at least one nitrogen and one sulfur as3,952
- A61K 31/53Having six-membered rings with three nitrogens as the only ring hetero atoms1,699
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Most cited
By later US patents
- Wound dressing with conformable elastomeric wound contact layer1,263US 5,445,604 ASmith and Nephew Associated Companies Limited · 1995
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- Anti-angiogenic compositions and methods of use968US 5,716,981 AAngiogenesis Technologies, Inc. · 1998
- Solid carriers for improved delivery of active ingredients in pharmaceutical compositions930US 6,248,363 B1Lipocine Inc. · 2001
- Cytotoxic agents comprising maytansinoids and their therapeutic use805US 5,208,020 AImmunoGen, Inc. · 1993