C09K 19/345
The heterocyclic ring being a six-membered aromatic ring containing two nitrogen atoms
Official title: {the heterocyclic ring being a six-membered aromatic ring containing two nitrogen atoms}
C09K19/345 (The heterocyclic ring being a six-membered aromatic ring containing two nitrogen atoms) appears on 617 US grants and 221 published applications in this corpus.
Search patents in C09K- Granted patents
- 617
- Published applications
- 221
- Assignees
- 131
- Inventors
- 841
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 3 | 0 |
| 1985 | 3 | 0 |
| 1986 | 11 | 0 |
| 1987 | 16 | 0 |
| 1988 | 14 | 0 |
| 1989 | 35 | 0 |
| 1990 | 27 | 0 |
| 1991 | 32 | 0 |
| 1992 | 25 | 0 |
| 1993 | 36 | 0 |
| 1994 | 40 | 0 |
| 1995 | 42 | 0 |
| 1996 | 28 | 0 |
| 1997 | 21 | 0 |
| 1998 | 27 | 0 |
| 1999 | 14 | 0 |
| 2000 | 16 | 0 |
| 2001 | 14 | 2 |
| 2002 | 12 | 14 |
| 2003 | 12 | 8 |
| 2004 | 15 | 6 |
| 2005 | 4 | 10 |
| 2006 | 10 | 1 |
| 2007 | 5 | 7 |
| 2008 | 3 | 4 |
| 2009 | 4 | 3 |
| 2010 | 3 | 13 |
| 2011 | 3 | 8 |
| 2012 | 7 | 4 |
| 2013 | 7 | 15 |
| 2014 | 3 | 12 |
| 2015 | 12 | 14 |
| 2016 | 17 | 26 |
| 2017 | 22 | 9 |
| 2018 | 8 | 21 |
| 2019 | 13 | 7 |
| 2020 | 8 | 8 |
| 2021 | 10 | 7 |
| 2022 | 6 | 6 |
| 2023 | 3 | 4 |
| 2024 | 6 | 7 |
| 2025 | 4 | 4 |
| 2026 | 4 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- 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
- Liquid crystalline medium and electro-optical device16 Jun 2026US 12,655,350 B2Merck Patent GmbH
- Optically anisotropic layer, optical film, polarizing plate, and image display device28 Apr 2026US 12,612,553 B2FUJIFILM Corporation
- Ferroelectric nematic liquid crystalline medium7 Apr 2026US 12,595,414 B2Merck Patent GmbH
- Compound and liquid crystal composition25 Nov 2025US 12,480,049 B2The Hong Kong University of Science and Technology
- Polymerizable liquid crystal composition8 Oct 2026US 2026/0308453 A1Rolic Technologies AG
- Ferroelectric smectic liquid crystalline medium16 Oct 2025US 2025/0320408 A1Merck Patent GmbH
- Liquid-crystalline medium7 Aug 2025US 2025/0250486 A1Merck Patent GmbH
- Electro-mechanical converters using ferroelectric nematic material31 Jul 2025US 2025/0246949 A1Merck Patent GmbH
- Liquid crystalline medium and electro-optical device17 Jul 2025US 2025/0230359 A1Merck Patent GmbH
Most cited
By later US patents
- Trifluorobenzene derivative and liquid crystal composition containing the same83US 5,032,313 AChisso Corporation · 1991
- Novel liquid crystal mixtures79US 4,621,901 AHoffmann-La Roche Inc. · 1986
- Cyclohexane derivatives76US 4,510,069 AMerck Patent GmbH · 1985
- Liquid crystal compound70US 4,725,688 ASeiko Instruments Inc. · 1988
- Polymerizable, chiral compounds and their use70US 5,780,629 ABASF SE · 1998