US2817658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallisable trisazo dyestuffs
Assignee: Novartis AG
•
Filing: 1955-11-21
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Granted: 1957-12-24
•
Expires: 1975-11-21
Abstract
No abstract record available.
Inventors
- 👤 Bossard Werner
- 👤 Ammann Jurg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:52
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/38; C09B35/44; C09B35/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A TRISAZO DYESTUFF HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
7 words
A TRISAZO DYESTUFF HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-23 | 1961-06-24 | 1961-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-23 | 1965-06-24 | 1965-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-23 | 1969-06-24 | 1969-12-24 | $7700.00 | Window Closed / Lapsed |