US3793305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
One-step process of preparing azo dyes by simultaneous diazotization
Assignee: EIDP Inc
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Filing: 1970-09-14
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Granted: 1974-02-19
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Expires: 1990-09-14
Abstract
Abstract A ONE-STEP PROCESS FOR PREPARING AZO DYES IN A REACTION MIXTURE COMPRISING AN AROMATIC AMINE, COUPLER, DIAZOTIZING AGENT AND AN ACIDIC LIQUID MEDIUM CAPABLE OF DISSOLVING AT LEAST A PORTION OF THE AMINE AND THE COUPLER AND CAPABLE OF PRODUCING A PH OF 4 OR LESS WHEN THE MIXTURE IS DILUTED WITH 25% ITS VIOLUME OF WATER, MAINTAINING THE CONCENTRATION OF THE DIAZOTIZING AGENT AND THE TEMPERATURE AND ACIDITY OF THE MIXTURE SO THAT THE RATE OF CONSUMPTION OF DIAZOTIZING AGENT IS SUBSTANTIALLY THE SAME AS THE RATE OF FORMATION OF AZO DYE.
Inventors
- 👤 W Balon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:00
CPC Classifications
C; C09; C09B; C09B44/00; C09B44/02; C09B44/04; C09B41/00; C09B41/006; C09B41/009; C09B62/00; C09B62/44; C09B62/443; C09B62/447
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |