C09B 31/02
Disazo dyes
C09B31/02 (Disazo dyes) appears on 487 US grants and 193 published applications in this corpus.
Search patents in C09B- Granted patents
- 487
- Published applications
- 193
- Assignees
- 132
- Inventors
- 737
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 39 | 0 |
| 1977 | 45 | 0 |
| 1978 | 30 | 0 |
| 1979 | 19 | 0 |
| 1980 | 22 | 0 |
| 1981 | 14 | 0 |
| 1982 | 9 | 0 |
| 1983 | 15 | 0 |
| 1984 | 12 | 0 |
| 1985 | 6 | 0 |
| 1986 | 4 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 5 | 0 |
| 1990 | 5 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 9 | 0 |
| 1994 | 12 | 0 |
| 1995 | 8 | 0 |
| 1996 | 18 | 0 |
| 1997 | 14 | 0 |
| 1998 | 10 | 0 |
| 1999 | 10 | 0 |
| 2000 | 3 | 0 |
| 2001 | 4 | 1 |
| 2002 | 2 | 2 |
| 2003 | 3 | 3 |
| 2004 | 9 | 8 |
| 2005 | 3 | 5 |
| 2006 | 5 | 6 |
| 2007 | 7 | 5 |
| 2008 | 4 | 7 |
| 2009 | 5 | 10 |
| 2010 | 2 | 11 |
| 2011 | 3 | 14 |
| 2012 | 8 | 15 |
| 2013 | 15 | 10 |
| 2014 | 11 | 16 |
| 2015 | 12 | 14 |
| 2016 | 8 | 7 |
| 2017 | 7 | 15 |
| 2018 | 9 | 11 |
| 2019 | 15 | 7 |
| 2020 | 10 | 7 |
| 2021 | 5 | 3 |
| 2022 | 2 | 6 |
| 2023 | 2 | 2 |
| 2024 | 6 | 1 |
| 2025 | 1 | 4 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- C09B 31/04From a coupling component "c" containing a directive amino group151
- C09B 31/12From other coupling components "c"122
- C09B 31/06From a coupling component "c" containing a directive hydroxyl group106
- C09B 31/08From a coupling component "c" containing directive hydroxyl and amino groups88
- C09B 31/025Containing acid groups40
- C09B 31/10From a coupling component "c" containing reactive methylene groups14
Recent patents
- Colored fiber, method for manufacturing colored fiber, and fiber product29 Sep 2026US 12,747,518 B2Kaneka Corporation
- Compositions and methods for marking hydrocarbon compositions with non-mutagenic dyes17 Mar 2026US 12,577,484 B2United Color Manufacturing, Inc.
- Chiral azobenzene dopants with increased delta helical twisting power4 Feb 2025US 12,215,269 B1Nissan North America, Inc.
- Cerium (III) carbonate formulations31 Dec 2024US 12,180,084 B2The Regents of the University of California
- Dichroic azo-azomethine dyes for liquid crystal compositions22 Oct 2024US 12,122,919 B2BASF SE
- Alternative solvent systems and dye formulations10 Sep 2026US 2026/0265527 A1
- Synergists for Dimeric Pigments30 Jul 2026US 2026/0217982 A1Cabot Corporation
- Polarizing plate, liquid crystal panel using same, and photofabrication apparatus16 Jul 2026US 2026/0202599 A1Nippon Kayaku Kabushiki Kaisha
- Cerium (iii) carbonate formulations13 Mar 2025US 2025/0083971 A1The Regents of the University of California
- Substituted diazenylanilines as fluorescence quencher and use thereof27 Feb 2025US 2025/0066866 A1Council of Scientific and Industrial Research An Indian Registered Body Incoporated Under the Regn.
Most cited
By later US patents
- Waterfast ink formulations with a novel series of anionic dyes containing two or more carboxyl groups114US 4,963,189 AHewlett-Packard Company · 1990
- azo compound, and pigment dispersant, pigment composition, pigment dispersion and toner including the AZO compound52US 8,628,899 B2Canon Kabushiki Kaisha · 2014
- Recording liquid42US 4,557,761 ACanon Kabushiki Kaisha · 1985
- Heterocyclic azo dyes and pigments containing 4-quinazolinone moieties40US 4,225,489 ABayer Aktiengesellschaft · 1980
- 2-Thienyl azo dyestuff compounds34US 4,264,495 AEastman Kodak Company · 1981