C09K 19/3444
The heterocyclic ring being a six-membered aromatic ring containing one nitrogen atom
Official title: {the heterocyclic ring being a six-membered aromatic ring containing one nitrogen atom, e.g. pyridine}
C09K19/3444 (The heterocyclic ring being a six-membered aromatic ring containing one nitrogen atom) appears on 294 US grants and 164 published applications in this corpus.
Search patents in C09K- Granted patents
- 294
- Published applications
- 164
- Assignees
- 83
- Inventors
- 558
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 5 | 0 |
| 1988 | 7 | 0 |
| 1989 | 8 | 0 |
| 1990 | 8 | 0 |
| 1991 | 11 | 0 |
| 1992 | 10 | 0 |
| 1993 | 15 | 0 |
| 1994 | 11 | 0 |
| 1995 | 14 | 0 |
| 1996 | 8 | 0 |
| 1997 | 14 | 0 |
| 1998 | 11 | 0 |
| 1999 | 14 | 0 |
| 2000 | 10 | 0 |
| 2001 | 8 | 1 |
| 2002 | 4 | 8 |
| 2003 | 8 | 4 |
| 2004 | 4 | 2 |
| 2005 | 2 | 9 |
| 2006 | 6 | 0 |
| 2007 | 4 | 3 |
| 2008 | 3 | 2 |
| 2009 | 1 | 5 |
| 2010 | 7 | 12 |
| 2011 | 2 | 6 |
| 2012 | 7 | 2 |
| 2013 | 5 | 19 |
| 2014 | 6 | 10 |
| 2015 | 14 | 13 |
| 2016 | 10 | 5 |
| 2017 | 6 | 10 |
| 2018 | 4 | 17 |
| 2019 | 6 | 8 |
| 2020 | 10 | 6 |
| 2021 | 8 | 5 |
| 2022 | 5 | 3 |
| 2023 | 5 | 5 |
| 2024 | 3 | 6 |
| 2025 | 5 | 1 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Liquid crystal medium and electronic component6 Oct 2026US 12,753,345 B2Merck Patent GmbH
- Flexoelectric liquid crystal composition, liquid crystal element, laser inspection system, and method for analyzing test subject30 Jun 2026US 12,669,482 B2Tokyo University of Science Foundation
- Compound and liquid crystal composition25 Nov 2025US 12,480,049 B2The Hong Kong University of Science and Technology
- Liquid-crystal display26 Aug 2025US 12,398,325 B2Merck Patent GmbH
- Heteroaromatic isothiocyanates15 Jul 2025US 12,359,128 B2Merck Patent GmbH
- Method for producing cholesteric liquid crystal layer, cholesteric liquid crystal layer, liquid crystal composition, cured product, optically anisotropic body, and reflective layer1 Oct 2026US 2026/0299363 A1FUJIFILM Corporation
- Polymerizable liquid crystal formulations20 Aug 2026US 2026/0242666 A1Merck Patent GmbH
- Liquid-crystalline medium7 Aug 2025US 2025/0250486 A1Merck Patent GmbH
- Flexoelectric Liquid Crystal Composition, Liquid Crystal Element, Laser Inspection System, and Method for Analyzing Test Subject17 Oct 2024US 2024/0345033 A1Tokyo University of Science Foundation
- Liquid crystal medium and electronic component15 Aug 2024US 2024/0271042 A1Merck Patent GmbH
Most cited
By later US patents
- Ferroelectric liquid crystal compounds having perfluoroether terminal portions56US 5,262,082 AMinnesota Mining and Manufacturing Company · 1993
- Alkylbyphenyloxyacetic acid esters and their use in smectic liquid crystal materials55US 4,911,863 AThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland · 1990
- Coumarin and quinolinone derivatives for the production of orienting layers for liquid crystals53US 6,201,087 B1Rolic AG · 2001
- Nematic liquid-crystalline phases42US 4,871,469 ABescrankter Haftung · 1989
- Phenylpyrimidine derivatives41US 4,062,798 AHoffmann-La Roche Inc. · 1977