C09B 1/50
Amino-hydroxy-anthraquinones
Official title: Amino-hydroxy-anthraquinones; Ethers and esters thereof {(C09B1/007 takes precedence)}
C09B1/50 (Amino-hydroxy-anthraquinones) appears on 244 US grants and 63 published applications in this corpus.
Search patents in C09B- Granted patents
- 244
- Published applications
- 63
- Assignees
- 82
- Inventors
- 443
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 25 | 0 |
| 1977 | 21 | 0 |
| 1978 | 17 | 0 |
| 1979 | 8 | 0 |
| 1980 | 10 | 0 |
| 1981 | 19 | 0 |
| 1982 | 9 | 0 |
| 1983 | 10 | 0 |
| 1984 | 13 | 0 |
| 1985 | 12 | 0 |
| 1986 | 7 | 0 |
| 1987 | 8 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 4 | 0 |
| 1991 | 4 | 0 |
| 1992 | 4 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 4 | 1 |
| 2003 | 1 | 3 |
| 2004 | 2 | 5 |
| 2005 | 3 | 2 |
| 2006 | 2 | 5 |
| 2007 | 1 | 1 |
| 2008 | 2 | 2 |
| 2009 | 3 | 5 |
| 2010 | 4 | 4 |
| 2011 | 2 | 5 |
| 2012 | 3 | 4 |
| 2013 | 2 | 0 |
| 2014 | 1 | 3 |
| 2015 | 5 | 5 |
| 2016 | 3 | 1 |
| 2017 | 5 | 1 |
| 2018 | 0 | 1 |
| 2019 | 0 | 3 |
| 2020 | 1 | 2 |
| 2021 | 1 | 1 |
| 2022 | 1 | 4 |
| 2023 | 1 | 0 |
| 2024 | 3 | 4 |
| 2025 | 3 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- One-way circularly polarized light generated by propagation through Ch-GLC films doped with light-absorbing dyes4 Nov 2025US 12,461,297 B2University of Rochester
- Anthraquinone compound, liquid crystal composition containing said compound, and light-controlling element17 Jun 2025US 12,331,240 B2Nippon Kayaku Kabushiki Kaisha
- Anthraquinone compound, liquid crystal composition containing said compound, and dimming element27 May 2025US 12,312,294 B2Nippon Kayaku Kabushiki Kaisha
- Contact lens10 Dec 2024US 12,164,182 B2CooperVision International Limited
- Anthraquinone compound-containing liquid crystal composition for controlling light, photocured product thereof, and light-controlling element3 Dec 2024US 12,157,851 B2Nippon Kayaku Kabushiki Kaisha
- Disperse dyes for dyeing polyester fibres8 Oct 2026US 2026/0308841 A1University of Leeds
- Anthraquinone compound, liquid crystal composition containing said compound, and dimming element12 Dec 2024US 2024/0409497 A1Nippon Kayaku Kabushiki Kaisha
- Anthraquinone compound, liquid crystal composition containing said compound, and light-controlling element5 Dec 2024US 2024/0400899 A1Nippon Kayaku Kabushiki Kaisha
- Anthraquinone Compound-Containing Liquid Crystal Composition For Controlling Light, Photocured Product Thereof, And Light-Controlling Element15 Feb 2024US 2024/0052243 A1Nippon Kayaku Kabushiki Kaisha
- Anthraquinone Compound-Containing Liquid Crystal Composition For Controlling Light, Photocured Product Thereof, And Light-Controlling Element8 Feb 2024US 2024/0043749 A1Nippon Kayaku Kabushiki Kaisha
Most cited
By later US patents
- Colorant compounds97US 6,958,406 B2Xerox Corporation · 2005
- Phase change inks87US 6,821,327 B2Xerox Corporation · 2004
- Methods for making colorant compounds83US 7,053,227 B2Xerox Corporation · 2006
- Method for producing lightfast disperse dyestuffs containing a build-in photostabilizer [molecule] compound55US 4,902,787 ANorth Carolina State University · 1990
- Liquid crystals having pleochroic dyes41US 4,363,743 ASiemens Aktiengesellschaft · 1982