C09B 43/30
Preparation of azo dyes from other azo compounds: by esterification of —cooh
Official title: by esterification of —COOH or —SO3H groups
C09B43/30 (Preparation of azo dyes from other azo compounds: by esterification of —cooh) appears on 13 US grants and 4 published applications in this corpus.
Search patents in C09B- Granted patents
- 13
- Published applications
- 4
- Assignees
- 15
- Inventors
- 25
- Latest grant
- 7 May 2019
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 2 | 2 |
| 2013 | 0 | 1 |
| 2014 | 1 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Coloring composition, anisotropic light absorption film, laminate, polarizing plate, image display device and compound7 May 2019US 10,280,181 B2FUJIFILM Corporation
- Dye-ascorbic acid derivatives29 Apr 2014US 8,709,104 B2Merck Patent GmbH
- 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
- Dyestuffs and resin compositions18 Apr 2000US 6,051,360 AMitsui Chemicals, Inc.
- Coloring composition, anisotropic light absorption film, laminate, polarizing plate, image display device and compound24 Nov 2016US 2016/0340367 A1FUJIFILM Corporation
- Dye-ascorbic acid derivatives23 May 2013US 2013/0125317 A1Merck Patent GmbH
- 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
Most cited
By later US patents
- Pleochroic azo dyes, a liquid crystal composition containing the azo dyes and a display device using the liquid crystal composition12US 4,493,532 AHitachi, Ltd. · 1985
- Halftone gravure printing inks containing pyridone azo dyestuffs12US 4,739,042 ABayer Aktiengesellschaft · 1988
- Linked azo dyes8US 5,549,853 ABASF SE · 1996
- Water-insoluble polyazo dyestuff comprising two or three identical azo dyestuffs joined to a central nucleus by carboxyl bridges6US 3,971,741 ABayer Aktiengesellschaft · 1976
- Diffusion transfer material and process4US 4,477,554 AAgfa-Gevaert · 1984