C09B 23/162
Only nitrogen atoms
Official title: {only nitrogen atoms (azomethine dyes C09B55/00, e.g. those of formula aryl-CH=N-aryl; formazan dyes C09B50/00, e.g. dyes containing the moiety -N-N=CR-N=N-)}
C09B23/162 (Only nitrogen atoms) appears on 159 US grants and 117 published applications in this corpus.
Search patents in C09B- Granted patents
- 159
- Published applications
- 117
- Assignees
- 64
- Inventors
- 314
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 5 | 0 |
| 1978 | 4 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 6 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 5 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 2 |
| 2004 | 2 | 2 |
| 2005 | 1 | 3 |
| 2006 | 1 | 0 |
| 2007 | 3 | 2 |
| 2008 | 1 | 0 |
| 2009 | 1 | 1 |
| 2010 | 1 | 12 |
| 2011 | 0 | 2 |
| 2012 | 2 | 7 |
| 2013 | 8 | 7 |
| 2014 | 5 | 5 |
| 2015 | 9 | 9 |
| 2016 | 7 | 9 |
| 2017 | 11 | 19 |
| 2018 | 5 | 12 |
| 2019 | 12 | 5 |
| 2020 | 8 | 6 |
| 2021 | 4 | 1 |
| 2022 | 2 | 5 |
| 2023 | 4 | 2 |
| 2024 | 1 | 2 |
| 2025 | 2 | 2 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Cyanine dyes12 May 2026US 12,624,391 B2Pacific Biosciences of California, Inc.
- Pigmented and fluorescent compounds derived from the addition of a primary or secondary amine to an aldehyde31 Mar 2026US 12,590,209 B2Regents of the University of Minnesota
- Wavelength selective absorption filter and organic electroluminescent display device25 Nov 2025US 12,479,989 B2FUJIFILM Corporation
- Optical filter and imaging device28 Oct 2025US 12,454,619 B2AGC Inc.
- Optical filter and imaging device28 May 2024US 11,993,718 B2AGC Inc.
- Optical filter and imaging device15 Jan 2026US 2026/0015507 A1AGC Inc.
- Photosensitive composition, hologram recording medium, hologram optical element, optical device, and electronic device4 Dec 2025US 2025/0370407 A1Sony Group Corporation
- Wavelength selective absorption filter and organic electroluminescent display device13 Nov 2025US 2025/0346750 A1FUJIFILM Corporation
- Optical filter and imaging device29 Aug 2024US 2024/0287312 A1AGC Inc.
- Cyanine Dyes25 Apr 2024US 2024/0132948 A1Pacific Biosciences of California, Inc.
Most cited
By later US patents
- Cyanine dye labelling reagents with meso-substitution77US 7,172,907 B2GE Healthcare Bio-Sciences AB · 2007
- Pharmaceutical compositions of near IR closed chain, sulfo-cyanine dyes74US 10,405,753 B2Intuitive Surgical Operations, Inc. · 2019
- Photosensitive member with hydrazone charge transport material67US 4,786,571 AMinolta Camera Kabushiki Kaisha · 1988
- Diazamerocyanines for dyeing keratinous fibers58US 3,985,499 AL'oreal · 1976
- Electrophotographic photosensitive member with hydrazone compound52US 4,399,207 ACanon Kabushiki Kaisha · 1983