US2597676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Complex chromium compounds of o.o'-dihydroxy azo dyestuffs
Assignee: Novartis AG
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Filing: 1951-05-28
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Granted: 1952-05-20
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Expires: 1971-05-28
Abstract
No abstract record available.
Inventors
- 👤 Schetty Guido
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:59
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
THE COMPLEX CHROMIUM COMPOUND OF A MONOAZO DYESTUFF HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
12 words
THE COMPLEX CHROMIUM COMPOUND OF A MONOAZO DYESTUFF HAVING THE GENERAL FORMULA:
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) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |