C09B 43/28
Preparation of azo dyes from other azo compounds: by etherification of hydroxyl
Official title: by etherification of hydroxyl groups
C09B43/28 (Preparation of azo dyes from other azo compounds: by etherification of hydroxyl) appears on 52 US grants and 9 published applications in this corpus.
Search patents in C09B- Granted patents
- 52
- Published applications
- 9
- Assignees
- 31
- Inventors
- 91
- Latest grant
- 31 Dec 2019
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 6 | 0 |
| 1978 | 5 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 4 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 2 |
| 2019 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Dye compound, polarizer using the dye compound, and display device using the dye compound31 Dec 2019US 10,519,316 B2Samsung Display Co., Ltd.
- Dichroic pigment compounds and compositions containing the same17 Jul 2018US 10,023,743 B2Sumitomo Chemical Company, Limited
- Benzothiazol-2-ylazo-phenyl compound as dye, compositions including the dye, and method of determining degree of cure of such compositions26 Sep 2017US 9,772,321 B23M Innovative Properties Company
- Photosensitive azobenzene derivative8 Sep 2015US 9,126,899 B2National Institute of Advanced Industrial Science and Technology
- Dichroic dye for use in polarizing film, polarizing film, and display device including the polarizing film25 Mar 2014US 8,679,376 B2Samsung Electronics Co., Ltd.
- Composition, dichroic substance, light absorption anisotropic film, laminate, and image display device19 Dec 2019US 2019/0382586 A1FUJIFILM Corporation
- Dye compound, polarizer using the dye compound, and display device using the dye compound13 Dec 2018US 2018/0355181 A1Samsung Display Co., Ltd.
- Compound and composition containing same8 Feb 2018US 2018/0037739 A1Sumitomo Chemical Company, Limited
- Benzothiazol-2-ylazo-phenyl compound as dye, compositions including the dye, and method of determining degree of cure of such compositions11 Feb 2016US 2016/0041143 A13M Innovative Properties Company
- Photosensitive azobenzene derivative30 Oct 2014US 2014/0323704 A1National Institute of Advanced Industrial Science and Technology
Most cited
By later US patents
- Liquid crystal coupled dichroic dyes24US 5,389,285 AHercules Incorporated · 1995
- Liquid crystal mixtures16US 4,395,350 AHoffmann-La Roche Inc. · 1983
- Yellow disazo acid dye solution15US 3,963,418 AE. I. Du Pont de Nemours and Company · 1976
- Photorefractive composite14US 6,221,535 B1The Victoria University of Manchester · 2001
- Liquid crystalline azobenzene compounds13US 3,984,392 AU. S. Philips Corporation · 1976