C09B 45/38
Preparation from compounds with —oh and —cooh adjacent in the same ring
Official title: Preparation from compounds with —OH and —COOH adjacent in the same ring or in peri position
C09B45/38 (Preparation from compounds with —oh and —cooh adjacent in the same ring) appears on 6 US grants and 0 published applications in this corpus.
Search patents in C09B- Granted patents
- 6
- Published applications
- 0
- Assignees
- 5
- Inventors
- 11
- Latest grant
- 3 Nov 1992
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Method of dyeing leather with metal complex dyes comprised of metalizable azo compounds3 Nov 1992US 5,160,504 AOrient Chemical Industries, Ltd.
- Metal complex dyes and preparation thereof10 Mar 1992US 5,095,100 AOrient Chemical Industries, Ltd.
- Salicyl phenyl naphthyl trisazo di and trisulfonic developed direct black dyes21 Jul 1981US 4,279,814 ACrompton & Knowles Corporation
- Iron complex azo dyestuffs17 Mar 1981US 4,256,634 ABayer Aktiengesellschaft
- Rubine mixed strontium-cadmium salts of 3-chloro-4-methyl-6-sulfophenylazo-hydroxynaphthoic acid19 Sep 1978US 4,115,377 AHercules Incorporated
No published applications in this class yet.
Most cited
By later US patents
- Azo dyestuffs6US 4,091,021 AImperial Chemical Industries PLC · 1978
- Salicyl phenyl naphthyl trisazo di and trisulfonic developed direct black dyes5US 4,279,814 ACrompton & Knowles Corporation · 1981
- Rubine mixed strontium-cadmium salts of 3-chloro-4-methyl-6-sulfophenylazo-hydroxynaphthoic acid3US 4,115,377 AHercules Incorporated · 1978
- Iron complex azo dyestuffs3US 4,256,634 ABayer Aktiengesellschaft · 1981
- Metal complex dyes and preparation thereof2US 5,095,100 AOrient Chemical Industries, Ltd. · 1992