US2769806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disazo-dyestuffs
Assignee: BASF Schweiz AG
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Filing: 1953-04-06
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Granted: 1956-11-06
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Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 Weber Oscar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:56
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/039; C09B35/08; C09B35/10; C09B35/16; C09B45/00; C09B45/34
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
12 words
A DISAZO-DYESTUFF WHICH IN ITS FREE ACID FORM CORRESPONDS TO THE 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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |