C09B 43/00
Preparation of azo dyes from other azo compounds
C09B43/00 (Preparation of azo dyes from other azo compounds) appears on 528 US grants and 156 published applications in this corpus.
Search patents in C09B- Granted patents
- 528
- Published applications
- 156
- Assignees
- 151
- Inventors
- 757
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 42 | 0 |
| 1977 | 44 | 0 |
| 1978 | 27 | 0 |
| 1979 | 11 | 0 |
| 1980 | 20 | 0 |
| 1981 | 23 | 0 |
| 1982 | 11 | 0 |
| 1983 | 19 | 0 |
| 1984 | 10 | 0 |
| 1985 | 11 | 0 |
| 1986 | 8 | 0 |
| 1987 | 14 | 0 |
| 1988 | 14 | 0 |
| 1989 | 7 | 0 |
| 1990 | 5 | 0 |
| 1991 | 10 | 0 |
| 1992 | 7 | 0 |
| 1993 | 15 | 0 |
| 1994 | 10 | 0 |
| 1995 | 14 | 0 |
| 1996 | 12 | 0 |
| 1997 | 12 | 0 |
| 1998 | 14 | 0 |
| 1999 | 11 | 0 |
| 2000 | 4 | 0 |
| 2001 | 9 | 1 |
| 2002 | 11 | 3 |
| 2003 | 8 | 6 |
| 2004 | 6 | 14 |
| 2005 | 5 | 11 |
| 2006 | 17 | 13 |
| 2007 | 9 | 9 |
| 2008 | 6 | 6 |
| 2009 | 4 | 12 |
| 2010 | 7 | 10 |
| 2011 | 4 | 10 |
| 2012 | 8 | 10 |
| 2013 | 9 | 6 |
| 2014 | 7 | 7 |
| 2015 | 6 | 5 |
| 2016 | 5 | 7 |
| 2017 | 7 | 5 |
| 2018 | 6 | 5 |
| 2019 | 6 | 3 |
| 2020 | 2 | 1 |
| 2021 | 1 | 3 |
| 2022 | 1 | 4 |
| 2023 | 0 | 4 |
| 2024 | 4 | 1 |
| 2025 | 3 | 0 |
| 2026 | 2 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C09B 43/12Preparation of azo dyes from other azo compounds: by acylation of amino184
- C09B 43/40Preparation of azo dyes from other azo compounds: by substituting hetero atoms72
- C09B 43/18Preparation of azo dyes from other azo compounds: by acylation of hydroxyl70
- C09B 43/28Preparation of azo dyes from other azo compounds: by etherification of hydroxyl52
- C09B 43/32Preparation of azo dyes from other azo compounds: by reacting carboxylic or52
- C09B 43/11Preparation of azo dyes from other azo compounds: by introducing hydrocarbon radicals45
- C09B 43/08Preparation of azo dyes from other azo compounds: by reduction26
- C09B 43/30Preparation of azo dyes from other azo compounds: by esterification of —cooh13
All 14 subgroupsShow fewer
- C09B 43/003Cyclisation of azo dyes12
- C09B 43/06Preparation of azo dyes from other azo compounds: by oxidation9
- C09B 43/44Preparation of azo dyes from other azo compounds: by substituting amine groups9
- C09B 43/006Preparation of azo dyes from other azo compounds: by introduction of hydrocarbon8
- C09B 43/02Preparation of azo dyes from other azo compounds: by sulfonation2
- C09B 43/04Preparation of azo dyes from other azo compounds: by nitration0
Recent patents
- Bis-azo dyes for thin film polarizers and synthesis method12 May 2026US 12,624,212 B2The Hong Kong University of Science and Technology
- Reactive disperse yellow dye for supercritical CO2 dyeing and methods of production and use thereof20 Jan 2026US 12,528,943 B2Dalian Polytechnic University
- Composition comprising hueing agent7 Oct 2025US 12,435,299 B2Milliken & Company
- Azo compound, composition, film, laminate, and display device20 May 2025US 12,305,104 B2Sumitomo Chemical Company, Limited
- Composition comprising hueing agent14 Jan 2025US 12,195,703 B2Milliken & Company
- Composition Comprising Hueing Agent12 Sep 2024US 2024/0301330 A1Milliken & Company
- Azo compound, composition, film, laminate, and display device28 Dec 2023US 2023/0416610 A1Sumitomo Chemical Company, Limited
- Composition Comprising Hueing Agent21 Dec 2023US 2023/0407207 A1Milliken & Company
- Bis-azo dyes for thin film polarizers and synthesis method21 Sep 2023US 2023/0295438 A1The Hong Kong University of Science and Technology
- Reactive Disperse Yellow Dye for Supercritical CO2 Dyeing and Methods of Production and Use Thereof18 May 2023US 2023/0151218 A1Dalian Polytechnic University
Most cited
By later US patents
- Managing computer network resources316US 7,747,730 B1Netfuel,Inc · 2010
- Cationic imidazole azo dyes292US 5,708,151 ACiba Specialty Chemicals Corporation · 1998
- Aqueous ink composition for ink-jet recording98US 4,737,190 ARicoh Company, Ltd. · 1988
- Aqueous ink composition81US 4,711,668 ARicoh Company, Ltd. · 1987
- Aqueous ink composition for ink jet-recording78US 4,647,310 ARicoh Company, Ltd. · 1987