Patent US2120741A successfully refreshed from Google Patents.
US2120741A
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US
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Derivatives of dyestuffs containing hydroxyl groups and process of making same
Assignee: FIRM OF SOCIETY OF CHEMICAL INDUSTRY IN BASLE
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Filing: 1936-07-23
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Granted: 1938-06-14
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Expires: 1956-07-23
Abstract
No abstract record available.
Inventors
- 👤 Graenacher Charles
- 👤 Bruengger Heinrich
- 👤 Ackermann Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:27
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/18
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) | 1941-06-13 | 1941-12-13 | 1942-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-06-13 | 1945-12-13 | 1946-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-06-13 | 1949-12-13 | 1950-06-14 | $7700.00 | Window Closed / Lapsed |