US3406161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of azo dyestuffs using urea as a coupling accelerator
Assignee: Sandoz AG
•
Filing: 1965-08-26
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Granted: 1968-10-15
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Expires: 1985-08-26
Abstract
No abstract record available.
Inventors
- 👤 Dore Jacky
- 👤 Ischer Hans
- 👤 Maderni Piero
- 👤 Schneider Lukas
- 👤 Schweizer August
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:14
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/36; C09B31/00; C09B31/02; C09B31/025; C09B41/00; C09B41/001; C09B41/004; C09B45/00; C09B45/02; C09B45/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2891047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-15 | 1972-04-15 | 1972-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-15 | 1976-04-15 | 1976-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-15 | 1980-04-15 | 1980-10-15 | $7700.00 | Window Closed / Lapsed |