Patent US2736724A successfully refreshed from Google Patents.
US2736724A
Expired / Lapsed
US
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Disazo dyestuffs
Assignee: Sandoz AG
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Filing: 1953-08-24
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Granted: 1956-02-28
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Expires: 1973-08-24
Abstract
No abstract record available.
Inventors
- 👤 Maderni Piero
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:54
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/26; C09B45/00; C09B45/02; C09B45/24; C09B45/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
8 words
A DISAZO DYESTUFF WHICH CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
GB191020216A
Cited
CH167387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |