C09B 3/22
Dibenzanthrones
Official title: Dibenzanthrones; Isodibenzanthrones
C09B3/22 (Dibenzanthrones) appears on 18 US grants and 7 published applications in this corpus.
Search patents in C09B- Granted patents
- 18
- Published applications
- 7
- Assignees
- 8
- Inventors
- 28
- Latest grant
- 30 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 1 |
| 2019 | 0 | 1 |
| 2020 | 0 | 0 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 1 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Materials for organic electroluminescent devices30 Sep 2025US 12,433,160 B2Merck Patent GmbH
- Method for chlorinating blue anthrone, violanthrone or isoviolantrone26 Mar 2024US 11,939,475 B2
- Coatable grey polarizer30 Mar 2021US 10,962,696 B2Light Polymers Holding
- Chemiluminescent materials and method of making same7 Aug 2018US 10,040,993 B1The United States of America as represented by the Secretary of the Air Force
- Organic electronic device23 Jun 2015US 9,066,410 B2Merck Patent GmbH
- Materials for organic electroluminescent devices14 Mar 2024US 2024/0090327 A1Merck Patent GmbH
- Method for chlorinating blue anthrone, violanthrone or isoviolantrone25 May 2023US 2023/0159761 A1
- Coatable grey polarizer1 Aug 2019US 2019/0235144 A1Light Polymers Holding
- Chemiluminescent materials and method of making same9 Aug 2018US 2018/0223185 A1Government of the United States as Represented by the Secretary of the Air Force
- Organic electronic device8 Dec 2011US 2011/0297925 A1Merck Patent GmbH
Most cited
By later US patents
- Concentration of light over a particular area and novel fluorescent compounds13US 4,486,587 ABASF SE · 1984
- Chemiluminescent materials and method of making same7US 10,040,993 B1The United States of America as represented by the Secretary of the Air Force · 2018
- Fluorescent dyes5US 6,215,008 B1Rohm and Haas Company · 2001
- Process for the preparation of anthraquinoid intermediates and vat dyes4US 4,784,805 ACiba-Geiby Corporation · 1988
- Vat dyes obtainable by bromination of dibenzanthrone and reaction with 1-aminoanthraquinone3US 4,547,575 ACiba-Geigy Corporation · 1985