C09B 1/503
Unsubstituted amino-hydroxy anthraquinone
Official title: unsubstituted amino-hydroxy anthraquinone
C09B1/503 (Unsubstituted amino-hydroxy anthraquinone) appears on 83 US grants and 11 published applications in this corpus.
Search patents in C09B- Granted patents
- 83
- Published applications
- 11
- Assignees
- 37
- Inventors
- 174
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 10 | 0 |
| 1978 | 6 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 6 | 0 |
| 1982 | 1 | 0 |
| 1983 | 5 | 0 |
| 1984 | 7 | 0 |
| 1985 | 9 | 0 |
| 1986 | 2 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 3 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 2 |
| 2015 | 2 | 1 |
| 2016 | 1 | 0 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 1 |
| 2022 | 0 | 2 |
| 2023 | 1 | 0 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
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
- Contact lens10 Dec 2024US 12,164,182 B2CooperVision International Limited
- Polycarbonate resin composition and optical molded product including the same28 Feb 2023US 11,591,475 B2LG Chem.Ltd.
- Thermal transfer recording sheet14 Mar 2017US 9,592,695 B2Canon Kabushiki Kaisha
- Colored charged silsesquioxanes5 Jan 2016US 9,228,063 B2BASF SE
- One-Way Circularly Polarized Light Generated by Propagation through Ch-GLC Films Doped with Light-Absorbing Dyes25 Aug 2022US 2022/0268982 A1University of Rochester
- Contact lens10 Mar 2022US 2022/0075210 A1CooperVision International Limited
- Anthraquinonic derivatives and their use as colouring agents7 Oct 2021US 2021/0309860 A1Pili
- Polycarbonate resin composition and optical molded product including the same30 Jul 2020US 2020/0239691 A1LG Chem.Ltd.
- Thermal transfer recording sheet17 Dec 2015US 2015/0360495 A1Canon Kabushiki Kaisha
Most cited
By later US patents
- Composition for liquid crystal color display elements38US 4,360,447 AMitsui Toatsu Chemicals, Inc. · 1982
- Composition for liquid crystal color display element34US 4,304,683 AMitsui Toatsu Chemicals, Inc. · 1981
- Liquid crystal compositions including pleochroic dye33US 4,232,950 AMinnesota Mining and Manufacturing Company · 1980
- Anthraquinone compounds useful in photographic processes24US 4,110,355 APolaroid Corporation · 1978
- Liquid crystal compositions containing pleochroic dye24US 4,232,949 AMinnesota Mining and Manufacturing Company · 1980