US2941858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixtures of water-insoluble disazo dyestuffs
Assignee: Sandoz AG
•
Filing: 1958-01-30
•
Granted: 1960-06-21
•
Expires: 1978-01-30
Abstract
No abstract record available.
Inventors
- 👤 Forter Willy
- 👤 Kehrer Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:22
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/24; C09B35/00; C09B35/02; C09B35/039; C09B35/08; Y; Y10; Y10S; Y10S534/00; Y10S534/01
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A MIXTURE OF WATER-INSOLUBLE DISAZO DYESTUFFS OBTAINED BY COUPLING 1 MOL OF THE TETRAZO COMPOUND OF A DIAMINE OF THE FORMULA
Claim 2
Dependent Claim
21 words
A MIXTURE OF WATER-INSOLUBLE DISAZO DYESTUFFS OBTAINED BY COUPLING 1 MOL OF THE TETRAZO COMPOUND OF A DIAMINE OF THE 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) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |