C09B 50/00
Formazane dyes
Official title: Formazane dyes; Tetrazolium dyes
C09B50/00 (Formazane dyes) appears on 26 US grants and 6 published applications in this corpus.
Search patents in C09B- Granted patents
- 26
- Published applications
- 6
- Assignees
- 19
- Inventors
- 62
- Latest grant
- 25 Sep 2012
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 0 |
| 2003 | 3 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 2 |
| 2006 | 0 | 1 |
| 2007 | 1 | 0 |
| 2008 | 2 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Substituted tetraazapentalenes25 Sep 2012US 8,273,877 B1The United States of America as represented by the Secretary of the Navy
- Optical recording medium, and, method and apparatus for optical recording and reproducing using optical recording medium21 Oct 2008US 7,439,008 B2Ricoh Company, Ltd.
- Use of tetra-azapentamethine compounds as direct dyeing agents and novel tetra-azapentamethine compounds15 Jul 2008US 7,399,320 B2L'oreal
- Use of tetra-azapentamethine compounds as direct dyeing agents and novel tetra-azapentamethine compounds25 Dec 2007US 7,311,736 B2L'oreal
- Optical recording medium13 Jul 2004US 6,762,008 B2Ricoh Company, Ltd.
- Use of tetra-azapentamethine compounds as direct dyeing agents and novel tetra-azapentamethine compounds24 Apr 2008US 2008/0092307 A1L'oreal
- Optical recording medium, and, method and apparatus for optical recording and reproducing using optical recording medium16 Feb 2006US 2006/0035172 A1Ricoh Company, Ltd.
- Light-fast, high-capacity optical storage media10 Nov 2005US 2005/0250047 A1
- Use of tetra-azapentamethine compounds as direct dyeing agents and novel tetraazapentamethine compounds10 Feb 2005US 2005/0028300 A1L'oreal
- Optical recording medium10 Apr 2003US 2003/0068576 A1Ricoh Company, Ltd.
Most cited
By later US patents
- Stabilization of tetrazolium salts with cyclodextrins66US 4,837,331 AWako Pure Chemical Industries, Ltd. · 1989
- Transition metal complex formazan dyestuffs containing at least one phosphonic acid group20US 4,079,049 AImperial Chemical Industries PLC · 1978
- Triphendioxazine triazinyl dyes having phosphonic acid groups20US 4,092,478 AImperial Chemical Industries PLC · 1978
- Use of tetra-azapentamethine compounds as direct dyeing agents and novel tetra-azapentamethine compounds17US 7,311,736 B2L'oreal · 2007
- Use of tetra-azapentamethine compounds as direct dyeing agents and novel tetra-azapentamethine compounds16US 7,399,320 B2L'oreal · 2008