Patent US2128256A successfully refreshed from Google Patents.
US2128256A
Expired / Lapsed
US
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Azo dyestuffs
Assignee: General Aniline Works Inc
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Filing: 1936-07-16
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Granted: 1938-08-30
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Expires: 1956-07-16
Abstract
No abstract record available.
Inventors
- 👤 Krzikalla Hans
- 👤 Ufer Hanns
- 👤 Eistert Bernd
- 👤 Klaproth Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:45
CPC Classifications
C; C09; C09B; C09B62/00; C09B62/44; C09B62/443; C09B62/447; C09B39/00
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) | 1941-08-29 | 1942-02-28 | 1942-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-08-29 | 1946-02-28 | 1946-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-08-29 | 1950-02-28 | 1950-08-30 | $7700.00 | Window Closed / Lapsed |