C07D 491/22
In which the condensed system contains four or more hetero rings
Official title: in which the condensed system contains four or more hetero rings
C07D491/22 (In which the condensed system contains four or more hetero rings) appears on 727 US grants and 945 published applications in this corpus.
Search patents in C07D- Granted patents
- 727
- Published applications
- 945
- Assignees
- 555
- Inventors
- 2,671
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 5 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 4 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 5 | 0 |
| 1990 | 7 | 0 |
| 1991 | 9 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 5 | 0 |
| 1996 | 1 | 0 |
| 1997 | 13 | 0 |
| 1998 | 16 | 0 |
| 1999 | 16 | 0 |
| 2000 | 17 | 0 |
| 2001 | 18 | 3 |
| 2002 | 15 | 8 |
| 2003 | 15 | 19 |
| 2004 | 17 | 22 |
| 2005 | 5 | 18 |
| 2006 | 14 | 18 |
| 2007 | 11 | 24 |
| 2008 | 12 | 22 |
| 2009 | 19 | 22 |
| 2010 | 13 | 33 |
| 2011 | 26 | 31 |
| 2012 | 24 | 30 |
| 2013 | 22 | 33 |
| 2014 | 29 | 40 |
| 2015 | 32 | 38 |
| 2016 | 31 | 47 |
| 2017 | 30 | 36 |
| 2018 | 30 | 38 |
| 2019 | 27 | 45 |
| 2020 | 35 | 48 |
| 2021 | 30 | 36 |
| 2022 | 25 | 57 |
| 2023 | 32 | 65 |
| 2024 | 37 | 76 |
| 2025 | 32 | 75 |
| 2026 | 25 | 61 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Camptothecin derivatives29 Sep 2026US 12,747,250 B2ImmunoGen, Inc.
- Fluorescent ion indicators and their applications29 Sep 2026US 12,748,118 B2AAT Bioquest, Inc.
- Prodrugs for sustained releasing therapeutic agents and uses thereof8 Sep 2026US 12,729,186 B2Liangjiang Medicine Co., Ltd.
- Long stokes shift chromenoquinoline dyes and uses in sequencing applications1 Sep 2026US 12,723,279 B2Illumina Cambridge Limited
- Method for efficiently extracting and separating high-purity tetrodotoxin from pufferfish viscera18 Aug 2026US 12,709,618 B2Zhongyang Biotechnology (Shanghai) Co., LTD.
- Deuterated camptothecin compound, and preparation therefor and use thereof8 Oct 2026US 2026/0308167 A1Shanghai Qilu Pharmaceutical Research and Development Centre Ltd.
- Organic electroluminescent materials and devices8 Oct 2026US 2026/0308168 A1Universal Display Corporation
- Organic electroluminescent element and electronic device1 Oct 2026US 2026/0297107 A1Idemitsu Kosan Co., Ltd.
- Exatecan derivative and antibody-drug conjugate thereof24 Sep 2026US 2026/0284214 A1Shanghai Qilu Pharmaceutical Research and Development Centre Ltd.
- Nitrogenous heterocycles for organic electroluminescent devices17 Sep 2026US 2026/0282745 A1UDC Ireland Limited
Most cited
By later US patents
- Removable transceiver module166US 6,551,117 B2Stratos Lightwave, Inc. · 2003
- Terminally-branched polymeric linkers and polymeric conjugates containing the same154US 6,153,655 AEnzon, Inc. · 2000
- Camptothecin derivatives and process for preparing same139US 4,604,463 AKabushiki Kaisha Yakult Honsha · 1986
- Camptothecin derivatives and process for preparing same115US 4,473,692 AKabushiki Kaisha Yakult Honsha · 1984
- Immunoconjugates with an intracellularly-cleavable linkage115US 7,999,083 B2Immunomedics, Inc. · 2011