C09B 57/005
Pyrocolline
Official title: {Pyrocolline; Phthalcoylpyrrocolline dyes}
C09B57/005 (Pyrocolline) appears on 4 US grants and 0 published applications in this corpus.
Search patents in C09B- Granted patents
- 4
- Published applications
- 0
- Assignees
- 2
- Inventors
- 1
- Latest grant
- 19 Jun 1984
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Triazinyl compounds as intermediates for producing naphthoquinone derivatives19 Jun 1984US 4,455,424 ASandoz Ltd.
- Naphthoquinone compounds16 Aug 1977US 4,042,591 ASandoz Ltd.
- Naphthoquinone derivatives5 Jul 1977US 4,033,963 ASandoz Ltd.
- Naphthoquinone derivatives6 Jan 1976US 3,931,163 ASandoz Ltd., (Sandoz AG)
No published applications in this class yet.
Most cited
By later US patents