US2673200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyestuffs
Assignee: Sandoz AG
•
Filing: 1951-06-19
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Granted: 1954-03-23
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Expires: 1971-06-19
Abstract
No abstract record available.
Inventors
- 👤 Ruckstuhl Hans
- 👤 Senn Otto
- 👤 Wehrli Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:54
CPC Classifications
C; C09; C09B; C09B39/00; C09B45/00; C09B45/02; C09B45/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
8 words
THE TETRAKISAZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
US1901387A
Cited
US2417306A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |