C09K 19/3452
Pyrazine
Official title: {Pyrazine}
C09K19/3452 (Pyrazine) appears on 62 US grants and 28 published applications in this corpus.
Search patents in C09K- Granted patents
- 62
- Published applications
- 28
- Assignees
- 34
- Inventors
- 170
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 7 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 6 | 0 |
| 1996 | 5 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 2 | 2 |
| 2004 | 2 | 1 |
| 2005 | 0 | 2 |
| 2006 | 3 | 0 |
| 2007 | 1 | 1 |
| 2008 | 0 | 2 |
| 2009 | 0 | 0 |
| 2010 | 1 | 4 |
| 2011 | 0 | 2 |
| 2012 | 0 | 0 |
| 2013 | 0 | 3 |
| 2014 | 2 | 1 |
| 2015 | 1 | 1 |
| 2016 | 3 | 0 |
| 2017 | 1 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 3 |
| 2023 | 1 | 1 |
| 2024 | 3 | 1 |
| 2025 | 1 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Optically anisotropic layer, optical film, polarizing plate, and image display device28 Apr 2026US 12,612,553 B2FUJIFILM Corporation
- Heteroaromatic isothiocyanates15 Jul 2025US 12,359,128 B2Merck Patent GmbH
- Polymerizable liquid crystal having a quinoxaline-hydrazone core11 Jun 2024US 12,006,463 B2Rolic Technologies AG
- Compositions of polymerizable liquid crystals9 Apr 2024US 11,952,524 B2Rolic Technologies AG
- Dichroic dye composition26 Mar 2024US 11,939,512 B2Merck Patent GmbH
- Polymerizable liquid crystal composition8 Oct 2026US 2026/0308453 A1Rolic Technologies AG
- Ferroelectric smectic liquid crystalline medium16 Oct 2025US 2025/0320408 A1Merck Patent GmbH
- Heteroaromatic isothiocyanates18 Apr 2024US 2024/0124779 A1Merck Patent GmbH
- Dichroic dye composition23 Feb 2023US 2023/0053362 A1Merck Patent GmbH
- Compositions of polymerizable liquid crystals22 Sep 2022US 2022/0298418 A1Rolic Technologies AG
Most cited
By later US patents
- Ethane derivatives53US 4,659,502 AMerck Patent GmbH · 1987
- Liquid crystal compounds and compositions49US 4,921,632 ANEC Corporation · 1990
- Liquid crystal device34US 4,721,367 ACanon Kabushiki Kaisha · 1988
- Anisotropic films based on sulfoderivatives of phenanthro-9′, 10′:2,3-quinoxaline and lyotropic liquid crystal systems and method for making30US 6,583,284 B1Optiva, Inc. · 2003
- Color correcting polarizer26US 7,144,608 B2Nitto Denko Corporation · 2006