C09K 19/3475
The heterocyclic ring being a six-membered aromatic ring containing at least three
Official title: {the heterocyclic ring being a six-membered aromatic ring containing at least three nitrogen atoms}
C09K19/3475 (The heterocyclic ring being a six-membered aromatic ring containing at least three) appears on 60 US grants and 54 published applications in this corpus.
Search patents in C09K- Granted patents
- 60
- Published applications
- 54
- Assignees
- 30
- Inventors
- 188
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
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| 1986 | 2 | 0 |
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| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
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| 1995 | 2 | 0 |
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| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 3 | 0 |
| 2003 | 1 | 2 |
| 2004 | 0 | 2 |
| 2005 | 1 | 2 |
| 2006 | 1 | 2 |
| 2007 | 2 | 4 |
| 2008 | 2 | 7 |
| 2009 | 2 | 5 |
| 2010 | 6 | 3 |
| 2011 | 3 | 3 |
| 2012 | 4 | 1 |
| 2013 | 2 | 5 |
| 2014 | 1 | 2 |
| 2015 | 3 | 3 |
| 2016 | 6 | 1 |
| 2017 | 2 | 2 |
| 2018 | 2 | 2 |
| 2019 | 1 | 1 |
| 2020 | 0 | 2 |
| 2021 | 1 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 2 |
| 2025 | 0 | 1 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
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Most cited
By later US patents
- Colorless liquid crystalline compounds61US 4,564,694 AHitachi, Ltd. · 1986
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- Anisotropic retardation layers for display devices39US 5,948,487 A3M Innovative Properties Company · 1999
- Optical compensatory sheet and liquid crystal display34US 6,380,996 B1Fuji Photo Film Co., Ltd. · 2002
- Liquid crystal materials and alignment structures and optical devices containing same18US 6,488,866 B13M Innovative Properties Company · 2002