C09B 50/04
Metal-free formazan dyes
C09B50/04 (Metal-free formazan dyes) appears on 3 US grants and 0 published applications in this corpus.
Search patents in C09B- Granted patents
- 3
- Published applications
- 0
- Assignees
- 2
- Inventors
- 6
- Latest grant
- 11 Nov 2003
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Formazan metal complex11 Nov 2003US 6,645,594 B1Kabushiki Kaisha Hayashibara Seibutsu Kagaku Kenkyujo
- Assay for lithium using tetra-substituted aryl cyclic formazan dyes24 Sep 1991US 5,051,367 AEastman Kodak Company
- Tetra-substituted aryl cyclic formazan dyes9 Jan 1990US 4,892,937 AEastman Kodak Company
No published applications in this class yet.
Most cited
By later US patents