C09K 19/3441
Having nitrogen as hetero atom
Official title: {having nitrogen as hetero atom}
C09K19/3441 (Having nitrogen as hetero atom) appears on 1,059 US grants and 578 published applications in this corpus.
Search patents in C09K- Granted patents
- 1,059
- Published applications
- 578
- Assignees
- 223
- Inventors
- 1,567
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 8 | 0 |
| 1983 | 4 | 0 |
| 1984 | 4 | 0 |
| 1985 | 4 | 0 |
| 1986 | 14 | 0 |
| 1987 | 23 | 0 |
| 1988 | 25 | 0 |
| 1989 | 42 | 0 |
| 1990 | 34 | 0 |
| 1991 | 39 | 0 |
| 1992 | 42 | 0 |
| 1993 | 55 | 0 |
| 1994 | 53 | 0 |
| 1995 | 60 | 0 |
| 1996 | 35 | 0 |
| 1997 | 28 | 0 |
| 1998 | 33 | 0 |
| 1999 | 25 | 0 |
| 2000 | 24 | 0 |
| 2001 | 17 | 2 |
| 2002 | 17 | 18 |
| 2003 | 16 | 15 |
| 2004 | 19 | 12 |
| 2005 | 13 | 24 |
| 2006 | 15 | 19 |
| 2007 | 16 | 19 |
| 2008 | 12 | 19 |
| 2009 | 13 | 27 |
| 2010 | 16 | 31 |
| 2011 | 18 | 21 |
| 2012 | 21 | 19 |
| 2013 | 17 | 38 |
| 2014 | 15 | 18 |
| 2015 | 30 | 32 |
| 2016 | 36 | 48 |
| 2017 | 33 | 33 |
| 2018 | 25 | 54 |
| 2019 | 28 | 22 |
| 2020 | 26 | 22 |
| 2021 | 26 | 23 |
| 2022 | 17 | 14 |
| 2023 | 17 | 17 |
| 2024 | 16 | 14 |
| 2025 | 11 | 10 |
| 2026 | 9 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C09K 19/345The heterocyclic ring being a six-membered aromatic ring containing two nitrogen atoms617
- C09K 19/3444The heterocyclic ring being a six-membered aromatic ring containing one nitrogen atom294
- C09K 19/3483The heterocyclic ring being a non-aromatic ring153
- C09K 19/3477The heterocyclic ring being a five-membered aromatic ring containing at least one143
- C09K 19/3475The heterocyclic ring being a six-membered aromatic ring containing at least three60
- C09K 19/3488The heterocyclic ring having more than 6 members42
Recent patents
- Liquid crystal medium and electronic component6 Oct 2026US 12,753,345 B2Merck Patent GmbH
- All-aromatic liquid-crystalline homo-polyimides with aromatic endgroups and crosslinked products therefrom15 Sep 2026US 12,734,747 B2The United States of America as represented by the Secretary of the Air Force
- All-aromatic liquid-crystalline homo-polyimides with aromatic endgroups and crosslinked products therefrom15 Sep 2026US 12,734,748 B2The United States of America as represented by the Secretary of the Air Force
- Polymerisable liquid crystal material and polymerised liquid crystal film21 Jul 2026US 12,686,820 B2Merck Patent GmbH
- Nonlinear optical chromophores having tetrahydrocarbazole donor groups, lyotropic compositions containing the same, and methods of poling such compositions30 Jun 2026US 12,668,743 B2Lightwave Logic, Inc.
- Polymerizable liquid crystal composition8 Oct 2026US 2026/0308453 A1Rolic Technologies AG
- 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
- Nonlinear Optical Chromophores Having Tetrahydrocarbazole Donor Groups, Lyotropic Compositions Containing the Same, and Methods of Poling Such Compositions24 Sep 2026US 2026/0286223 A1Lightwave Logic, Inc.
- Polymerizable liquid crystal formulations20 Aug 2026US 2026/0242666 A1Merck Patent GmbH
- Liquid crystal composition and liquid crystal display device16 Jul 2026US 2026/0201250 A1Jiangsu Hecheng Display Technology Co., Ltd.
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
- Nitrogen-containing heterocycles75US 4,834,904 AMerck Patent GmbH · 1989
- Liquid crystal compound70US 4,725,688 ASeiko Instruments Inc. · 1988