US1979913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromiferous azo-dyestuffs and process of making same
Assignee: BASF Schweiz AG
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Filing: 1933-11-06
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Granted: 1934-11-06
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Expires: 1953-11-06
Abstract
No abstract record available.
Inventors
- 👤 Straub Fritz
- 👤 Schneider Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:15
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/48
Claims Analysis
Total Claims: 0
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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) | 1937-11-05 | 1938-05-07 | 1938-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-11-05 | 1942-05-07 | 1942-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-11-05 | 1946-05-07 | 1946-11-06 | $7700.00 | Window Closed / Lapsed |