C09B 43/08
Preparation of azo dyes from other azo compounds: by reduction
Official title: by reduction
C09B43/08 (Preparation of azo dyes from other azo compounds: by reduction) appears on 26 US grants and 6 published applications in this corpus.
Search patents in C09B- Granted patents
- 26
- Published applications
- 6
- Assignees
- 21
- Inventors
- 47
- Latest grant
- 20 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 3 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 2 | 2 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Reactive disperse yellow dye for supercritical CO2 dyeing and methods of production and use thereof20 Jan 2026US 12,528,943 B2Dalian Polytechnic University
- Dyes with changeable solubilities, and methods for their use30 Oct 2012US 8,298,298 B1Empire Development Technology LLC
- Dyes with changeable solubilities, and methods for their use21 Aug 2012US 8,246,698 B2Empire Technology Development LLC
- Dichroic azo dyestuff and the polarizing film making from the same16 Oct 2007US 7,282,574 B1Everlight USA, Inc.
- Azoxy dyes and copper complexes thereof7 Jun 2005US 6,903,197 B2BASF SE
- Reactive Disperse Yellow Dye for Supercritical CO2 Dyeing and Methods of Production and Use Thereof18 May 2023US 2023/0151218 A1Dalian Polytechnic University
- Conjugates of bivalent evans blue dye derivatives and methods of use20 Jan 2022US 2022/0017495 A1The United States of America, as represented by the Secretary, Department of Health and Human Servic
- Dyes with changeable solubilities, and methods for their use1 Nov 2012US 2012/0272461 A1Empire Development Technology LLC
- Dyes with changeable solubilities, and methods for their use28 Jun 2012US 2012/0164288 A1Empire Technology Development LLC
- Dichroic azo dyestuff and the polarizing film making from the same16 Aug 2007US 2007/0190269 A1Everlight USA, Inc.
Most cited
By later US patents
- Pleochroic dyes50US 4,145,114 AThe Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland · 1979
- Photographic material containing sulphonic acid group containing disazo dyestuffs25US 4,118,232 ACiba-Geigy Corporation · 1978
- Sulfonic-acid-group containing disazo dyestuffs18US 4,051,123 ACiba-Geigy Corporation · 1977
- Symmetrical hexakisazo compounds having a 2,2'-disulfostilbenyl central radical10US 4,141,889 ASandoz Ltd. · 1979
- Liquid crystal composition7US 4,600,527 AHitachi, Ltd. · 1986