US3870695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heavy metal complexes of azo dyestuffs containing a 2-amino-3-hydroxypyridine as coupling component
Assignee: Novartis AG
•
Filing: 1972-07-21
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Granted: 1975-03-11
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Expires: 1992-07-21
Abstract
Abstract WHERE B is hydrogen, chloro or bromo and D is the residue of a diazo component of the benzene or naphthalene series that contains an hydroxyl, carboxyl or amino group in the position ortho to the azo group, are useful to dye substrates, notably wool, in level green and blue shades having good resistance to acid, alkali, light and rubbing. The heavy metal complexes of azo dyestuffs of formula
Inventors
- 👤 Gerhard Back
- 👤 Arthur Buehler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:28
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/002; C09B62/006; C09B29/00; C09B29/34; C09B29/36; C09B29/3604; C09B29/3617; C09B29/3621; C09B31/00; C09B31/02; C09B31/12; C09B31/14; C09B31/153; C09B45/00; C09B45/02; C09B45/025; C09B62/02; C09B62/36; C09B62/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
12 words
THE COPPER, NICKEL, CHROMIUM OR COBALT COMPLEX OF A COMPOUND OF FORMULA
Claim 2
Dependent Claim
12 words
THE COPPER, NICKEL, CHROMIUM OR COBALT COMPLEX OF A COMPOUND OF FORMULA
Claim 3
Dependent Claim
12 words
The copper, nickel, chromium or cobalt complex of a compound of formula
Claim 4
Dependent Claim
12 words
The copper, nickel, chromium or cobalt complex of a compound of formula
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |